Review · secondary evidenceReview

2D conductive metal-organic frameworks for electronics and spintronics

Xiaoyu Song, Jingjuan Liu, Ting Zhang, Long Chen · Science China Chemistry · 2020

This dossier represents secondary evidence: section summaries, claims and benchmarks are paraphrased for this database, not quoted. Check quantitative values against the linked primary study, and cite the review itself (10.1007/s11426-020-9791-2) for its arguments.

7review sections
8material families
21review claims
19secondary benchmarks
32cited studies
10research gaps

Review scope

Survey the electrical, magnetic and quantum properties of 2D conductive metal-organic frameworks, with emphasis on electronics, spintronics, semiconductors, metals, superconductors, topological insulators and porous magnets.

Coverage
2012–2020
Category
Review Theory Transport
Material scope
2D conductive metal-organic frameworks · pi-d conjugated MOFs · triphenylene-, benzene-, thiol-, selenol-, quinone- and phthalocyanine-based 2D frameworks · conductive MOF films, pellets, nanosheets and molecular model compounds
Transport scope
Through-bond charge transport · Through-space charge transport · Hopping transport · Band-like transport · Spin transport · Magnetoresistance · Superconductivity · Topological edge-state context
Application scope
Electronics · Spintronics · Semiconductors · Metals · Porous magnets · Organic spin valves · Quantum materials
Explicit exclusions
Full experimental recipes · Exhaustive coverage of energy-storage, catalysis and sensing applications · Primary-data re-analysis beyond selected review benchmarks
Source
1391 · Abstract
Evidence role
Context, taxonomy and secondary benchmarking

Section map

The review’s argument is preserved as a navigable set of section summaries.

5 Challenges and opportunities

1398-1400

Synthesises future needs around ordered layers, intrinsic mechanism identification, single-crystal and film growth, stability, processing and device fabrication.

Relevance: Core · 1398 · Challenges and opportunities

2 Electrical properties

1392-1394

Defines semiconductor/metal distinctions, through-bond versus through-space pathways, hopping versus band-like transport, and reviews key semiconducting and metallic 2D c-MOF examples.

Relevance: Core · 1392 · Electrical properties

1 Introduction

1391-1392

Introduces 2D c-MOFs as designable, conjugated organic/inorganic 2D materials and positions the review around charge and spin degrees of freedom rather than only electrical applications.

Relevance: Core · 1392 · Introduction

3 Magnetic properties

1394-1397

Explains spintronic motivation, magnet classes, radical/metal-linker design strategies, conductive porous magnets, ferromagnetic semiconductors and 2D c-MOF organic spin-valve examples.

Relevance: Core · 1394 · Magnetic properties

4 Quantum properties

1397-1398

Frames quantum states arising from coupled charge, spin, lattice and orbital degrees of freedom, focusing on superconductors and topological insulators.

Relevance: Core · 1397 · Quantum properties

4.1 Superconductor

1397-1398

Reviews theoretical and experimental Cu-BHT superconductivity as the key 2D c-MOF superconducting case, including crystallinity dependence and possible second phase.

Relevance: Core · 1397 · Superconductor · Figure 7

4.2 Topological insulator

1397-1398

Summarises 2D organometallic and 2D c-MOF topological-insulator proposals, emphasising lattice symmetry, spin-orbit coupling, redox control and heavy-atom effects.

Relevance: Supporting · 1397 · Topological insulator

Taxonomies

Classification systems are attributed to this review and are not treated as a global material registry.

Electronic Band Structure

Band-theory electronic classes

The review uses Fermi-level position and band gap concepts to distinguish metallic conductors, semiconductors and insulators before applying them to 2D c-MOFs.

Categories: metal · semiconductor · insulator

1392 · Electrical properties

Spin Ordering

Magnetic material classes

The review classifies magnetic behaviour by alignment and magnitude of adjacent spins, illustrated by the Figure 3 schematic.

Categories: diamagnet · paramagnet · ferromagnet · ferrimagnet · antiferromagnet

1394 · Magnetic properties · Figure 3

How Magnetic Interactions Are Introduced Or RelayedAuthor-proposed

Magnetic MOF design routes

The review contrasts shortening metal-metal distances with radical ligands that relay exchange between metal centres, while noting porosity trade-offs.

Categories: paramagnetic first-row transition metals · small diamagnetic linkers · radical-based ligands · redox-active radical linkers

1394 · Magnetic properties

Macroscopic Quantum State

Quantum-property classes relevant to 2D c-MOFs

Quantum properties are framed as emergent states from coupled charge, spin, lattice and orbital degrees of freedom.

Categories: Dirac semimetals · superconductors · topological insulators · quantum Hall effects

1397 · Quantum properties

Route To 2D Framework Formation

2D MOF synthesis approaches

In the outlook, synthesis is organised around top-down versus bottom-up routes, with high-quality single/few-layer growth highlighted as unresolved.

Categories: top-down methods · bottom-up methods · interfacial synthesis · chemical vapour deposition · liquid-air interfacial synthesis

1398 · Challenges and opportunities

Electronic/Topological Design Requirement

Topological-insulator ingredients

For 2D organic/organometallic TIs, the review emphasises SOC and lattice symmetry, then discusses doping and heavy atoms as tuning handles.

Categories: lattice symmetry · spin-orbit coupling · redox-controlled doping · heavy-atom effect

1397 · Topological insulator

Spatial Pathway For Charge Motion

Through-bond versus through-space transport

In-plane metal d orbital to ligand pi-system conjugation is described as the dominant through-bond route, while through-space transport depends on compact pi-pi stacked neighbouring ligands.

Categories: through-bond · through-space

1392 · Electrical properties

Temperature-Dependent Transport Mechanism

Hopping versus band-like transport

Increasing conductivity with temperature is associated with hopping semiconductor behaviour; decreasing conductivity with increasing temperature indicates band-like transport in metals or doped low-ionisation semiconductors.

Categories: hopping transport · band-like transport

1392 · Electrical properties

Material families

Review-defined families retain their representative materials and conduction descriptions.

Small benzene-core conductive frameworks

2D Frameworks And Nanosheets

2D c-MOFs based on compact benzene-derived HIB, HAB or HHB linkers that can increase orbital overlap and conductivity.

Conduction: The review associates smaller benzene-core linkers with higher conductivity and possible metallic behaviour, although anisotropy and grain-boundary effects complicate assignment.

Representative materials: Ni3(HIB)2 · Cu3(HIB)2 · M-HAB · Cu3(C6O6)2

Nodes / linkers: Ni · Cu · Co · hexaiminobenzene · hexaaminobenzene · hexahydroxybenzene

1393 · Electrical properties

Benzenehexathiol/benzenehexaselenol frameworks

2D Films, Nanosheets, Nanoplates And Theoretical Monolayers

Sulfur- or selenium-rich 2D frameworks using BHT or BHS ligands, prominent in metallic, superconducting and topological-insulator discussions.

Conduction: Strong metal-chalcogen coordination and pi conjugation support metallic behaviour, redox-tuned conductivity and, for Cu-BHT, superconductivity at low temperature.

Representative materials: Cu-BHT · Cu-BHS · Ni3(BHT)2 · NiDT · PtDT

Nodes / linkers: Cu · Ni · Pt · benzenehexathiol · benzenehexaselenol · bis(dithiolene)

1397 · Superconductor · Figure 7

Triphenylene imine/oxy 2D c-MOFs

2D Layered Frameworks, Films, Rods Or Molecular Models

Layered 2D c-MOFs built from triphenylene-derived HITP, HHTP or HOTP linkers and transition-metal nodes, used as central examples for semiconducting films, single-crystal transport and spin valves.

Conduction: Often semiconducting in polycrystalline films, but grain boundaries, dimensionality and out-of-plane interactions can alter the apparent transport nature.

Representative materials: Ni3(HITP)2 · Cu3HHTP2 · Cu3HITP2 · Cu3(HHTP)2

Nodes / linkers: Ni · Cu · HITP · HHTP · HOTP

1394 · Electrical properties

Tetraaza annulene Ni MOF

2D MOF Bulk Pellet/Doped Sample

NiTAA-MOF is used to discuss ligand oxidation, doped semiconducting behaviour and weak antiferromagnetic coupling.

Conduction: Bulk NiTAA-MOF is insulating, while I2 doping creates semiconducting behaviour through ligand oxidation and associated spin carriers.

Representative materials: NiTAA-MOF · I2-doped NiTAA-MOF

Nodes / linkers: Ni · tetraaza[14]annulene

1396 · Magnetic properties

Phthalocyanine-based conjugated MOFs

2D Layered And Conjugated Frameworks

Metal phthalocyanine or octahydroxyphthalocyaninato frameworks proposed or demonstrated for high-temperature magnetic correlations and spin/electronic coupling.

Conduction: Reviewed as p-type semiconducting or half-metallic/ferromagnetic candidates, with carrier-moment coupling inferred through negative magnetoresistance and magnetic measurements.

Representative materials: NiMn-OIPc · K3Fe2[PcFe-O8]

Nodes / linkers: Ni · Mn · Fe · octaiminophthalocyanine · octahydroxyphthalocyaninato iron

1396 · Magnetic properties · Figure 5

Perthiolated coronene Fe framework

2D C-MOF Pellets/Framework

An extended planar ligand and square-planar metal-linkage framework reviewed as a ferromagnetic semiconductor.

Conduction: Semiconducting pellets with high room-temperature conductivity and ferromagnetic behaviour below 20 K.

Representative materials: PTC-Fe

Nodes / linkers: Fe · perthiolated coronene

1395 · Magnetic properties · Figure 5

Tetraoxolene/semiquinone radical MOFs

2D Honeycomb Radical Frameworks

Redox-active radical-containing 2D frameworks where ligand mixed valency and metal centres create magnetic ordering, porosity and sometimes switchable conductivity.

Conduction: Radical linkers relay magnetic interactions; redox state can switch magnetism and conductivity, although absolute conductivity may remain low in some examples.

Representative materials: (Me2NH2)2[Fe2L3] · (Cp2Co)1.43(Me2NH2)1.57[Fe2L3] · (Me4N)2[Mn2(L)3] · Na3(Me4N)2[Mn2(L)3]

Nodes / linkers: Fe · Mn · chloranilate · benzoquinoid linkers · semiquinone radicals

1395 · Magnetic properties · Figure 4

Triphenylene thiol/selenol frameworks

2D Conjugated Frameworks And Films

Extended chalcogenated triphenylene frameworks such as Fe/Co-THT and Co-TPHS that highlight band-like transport, metal-semiconductor transitions and magnetic behaviour.

Conduction: Transport can be band-like and semi-metallic, with interlayer d/p orbital overlap and air oxidation affecting metallic transition behaviour.

Representative materials: Fe3(THT)2(NH4)3 · Co-THT · Fe-THT · Co-TPHS

Nodes / linkers: Fe · Co · hexathioltriphenylene · triphenylenehexaselenol

1393 · Electrical properties

Synthesis strategies

Review-level synthesis principles remain separate from primary-study recipes.

Air-liquid or liquid-air interfacial film growth

The review repeatedly cites interface-grown membranes, nanosheets and films as routes to smoother or more device-compatible 2D c-MOF materials.

Claimed effects: Can produce smoother membranes or nanosheets suitable for FETs, thin films and improved crystallinity relative to granular powders.

Controlling variables: interface choice · metal salt and ligand pairing · film thickness · crystallinity · transfer/lift-off processing

Representative materials: Ni3(HITP)2 membrane · M-HAB nanosheets · NiDT nanosheets · PtDT

Caveat: Interfacial synthesis is a strategy-level route; the review does not provide full recipes and still notes immature film processing.

1392 · Electrical properties

Bottom-up solution preparation

The outlook identifies bottom-up solution preparation as efficient, convenient and cost-effective for 2D c-MOF synthesis.

Claimed effects: Provides practical access to 2D c-MOF powders and films, but usually gives polycrystalline samples with short-range order.

Controlling variables: metal precursor · ligand · solvent · additives · concentration · pressure · atmosphere · reaction time

Representative materials: general 2D c-MOFs

Caveat: Most reported samples remain polycrystalline powders, limiting intrinsic-property interpretation.

1398 · Challenges and opportunities

Device-oriented film processing and heterostructure assembly

The review calls for improved interfacial synthesis, liquid-phase epitaxy, electrochemical deposition, solvo/hydrothermal methods and composite-film preparation for devices.

Claimed effects: Better films and MOF/COF or MOF/MOF composites should improve device integration and multifunctional behaviour.

Controlling variables: film thickness · interface definition · crystal domain size · heterostructure composition · electrode integration

Representative materials: Cu3HHTP2 OSV layer · MOF thin films · COF-MOF composite films · MOF-MOF composite films

Caveat: The review explicitly says current film processing is immature and thicker polycrystalline films have ill-defined interfaces.

1400 · Challenges and opportunities

Redox doping/post-synthetic oxidation or reduction

Guest oxidants/reductants or post-synthetic redox chemistry tune oxidation state, carrier density, magnetic state and conductivity.

Claimed effects: Can increase conductivity, switch magnetism, create radical spin carriers and tune topological or metallic states.

Controlling variables: dopant identity · oxidation state · air or iodine exposure · redox-active ligand groups · framework charge balance

Representative materials: NiDT · PtDT · NiTAA-MOF · Mn benzoquinoid framework · Fe-THT

Caveat: Air sensitivity and redox-state disorder can complicate stability and interpretation.

1398 · Topological insulator · Figure 8

Single-crystal optimisation for intrinsic transport

Optimised single-crystalline 2D c-MOF growth is presented as essential to distinguish intrinsic in-plane/out-of-plane pathways from grain-boundary effects.

Claimed effects: Single crystals with defined structures can reveal metallic behaviour masked in polycrystalline films and enable single-crystal diffraction/transport studies.

Controlling variables: additives · solvent · metal precursor · feeding sequence · concentration · atmosphere · pressure · reaction time

Representative materials: Cu3HHTP2 · Cu3HITP2 · Ni3(HITP)2 rods

Caveat: Large single-crystal growth remains a major challenge.

1399 · Challenges and opportunities

Vapour-induced conversion film fabrication

A vapour-induced conversion approach is cited for constructing conductive Ni3(HITP)2 film with magnetic hysteresis.

Claimed effects: Produces conductive Ni3(HITP)2 film whose magnetic measurements show hysteresis and ferromagnetic assignment.

Controlling variables: vapour conversion environment · film formation · Ni(II) high-spin state · temperature

Representative materials: Ni3(HITP)2 film

Caveat: The review reports the magnetic assignment but does not resolve broader spin-transport physics.

1396 · Magnetic properties

Review claims

These are the review authors’ synthesis, not newly measured results.

DescriptiveHigh supportDefinition Scope

2D c-MOFs are presented as an emerging class of 2D materials combining pre-designable structures, crystallinity, porosity and superior conductivity.

Evidence basis: review_reasoning

Caveat: This is the review authors' framing rather than a measured result.

1391 · Abstract

Author InterpretationHigh supportCaveat

Conventional conductivity measurements alone may not ascertain the nature of charge transport in 2D c-MOFs.

Evidence basis: multi_reference

Caveat: Requires complementary probes such as TRTS, Hall, UPS, Seebeck and theory.

1393 · Electrical properties

DescriptiveHigh supportMaterial Comparison

Cu-BHT is presented as the first reported coordination polymer with superconductivity, with theory and experiment making it a central quantum-material benchmark.

Evidence basis: multi_reference

Caveat: A second superconducting phase is noted but not clearly assigned.

1397 · Superconductor · Figure 7

Author InterpretationHigh supportApplication Relevance

Immature film processing and ill-defined interfaces in thicker polycrystalline films are major barriers to 2D c-MOF electronic devices.

Evidence basis: review_reasoning

Caveat: Not all films are equivalent; high-quality interfacial or single-crystal growth may mitigate this.

1399 · Challenges and opportunities

Author InterpretationMedium supportStructure Property Link

Dimensionality and interlayer transport can change the electronic character of a 2D c-MOF from semiconductor-like sheets to more metallic bulk behaviour.

Evidence basis: single_reference

Caveat: Based on DFT calculations as summarised by the review.

1394 · Electrical properties

Author InterpretationMedium supportApplication Relevance

Ferromagnetic semiconducting 2D c-MOFs are positioned as promising spin-polarised carrier sources for spintronic devices.

Evidence basis: multi_reference

Caveat: The review examples are still early and often involve low-temperature behaviour.

1395 · Magnetic properties

Author InterpretationHigh supportMeasurement Interpretation

Grain boundaries and sample crystallinity can cause the same framework family to appear semiconducting in polycrystalline films but metallic in single-crystal devices.

Evidence basis: single_reference

Caveat: The statement is tied to reviewed single-crystal examples and should not be universalised without primary confirmation.

1394 · Electrical properties

Consensus SummaryHigh supportStructure Property Link

Magnetic MOF design must balance short metal-metal distances, porosity and radical-mediated exchange pathways.

Evidence basis: multi_reference

Caveat: Shortening linkers can strengthen magnetic interactions but may inhibit porosity.

1394 · Magnetic properties

Consensus SummaryHigh supportMaterial Comparison

Most reported 2D c-MOFs are described as experimentally semiconducting with hopping transport behaviour.

Evidence basis: multi_reference

Caveat: The review also highlights exceptions and cases where apparent behaviour depends on sample form.

1392 · Electrical properties

Author InterpretationHigh supportMeasurement Interpretation

The review argues that mechanism identification requires combined conventional conductivity, carrier/electronic-structure probes and theory rather than one measurement type.

Evidence basis: review_reasoning

Caveat: Specific technique choice depends on sample form and target mechanism.

1399 · Challenges and opportunities

Author InterpretationHigh supportCaveat

The first 2D c-MOF organic spin valve demonstrates magnetoresistance, but spin-polarised transport physics remains unresolved.

Evidence basis: single_reference

Caveat: The cited OSV is by the review authors and is still interpreted cautiously in the review.

1396 · Magnetic properties · Figure 6

Consensus SummaryHigh supportStructure Property Link

The review attributes many electronic performances of 2D c-MOFs to in-plane pi-d conjugation and charge delocalisation across planar metal-ligand frameworks.

Evidence basis: multi_reference

Caveat: Extent of delocalisation varies by material quality and dimensionality.

1392 · Introduction

Author InterpretationHigh supportCaveat

Most reported 2D c-MOF samples are polycrystalline powders with short-range order, limiting intrinsic single-layer and transport interpretation.

Evidence basis: review_reasoning

Caveat: This is an outlook-level synthesis across the literature.

1398 · Challenges and opportunities

Consensus SummaryHigh supportStructure Property Link

Radical-based redox ligands provide a route to couple magnetic ordering, conductivity and porosity in 2D c-MOFs.

Evidence basis: multi_reference

Caveat: Absolute conductivity and ordering temperatures vary substantially by framework and redox state.

1394 · Magnetic properties

Author InterpretationMedium supportStructure Property Link

Smaller benzene-core linkers are associated with higher conductivity and possible metallic behaviour through better electronic wave-function overlap.

Evidence basis: multi_reference

Caveat: The review notes anisotropy and grain-boundary effects in these systems.

1393 · Electrical properties

Author InterpretationHigh supportCaveat

A profound understanding of spin mechanisms in 2D c-MOFs is missing because of complex components and extended framework structures.

Evidence basis: multi_reference

Caveat: Theoretical and molecular-model work is available but not yet sufficient.

1396 · Magnetic properties

Author InterpretationHigh supportSynthesis Strategy

The greatest synthetic challenge is controlling ordering and stacked layers in 2D frameworks because ordered structures reduce charge/spin transport barriers.

Evidence basis: review_reasoning

Caveat: The review frames this as a broad outlook statement rather than a single-study result.

1398 · Challenges and opportunities

Consensus SummaryHigh supportMeasurement Interpretation

Temperature-dependent conductivity is used as a heuristic to distinguish hopping semiconducting behaviour from band-like transport, but later caveats show this is insufficient alone.

Evidence basis: multi_reference

Caveat: The review explicitly says conventional conductivity can be insufficient for charge-transport assignment.

1392 · Electrical properties

Consensus SummaryHigh supportTransport Mechanism

For most 2D c-MOFs, through-bond transport via metal d orbitals and ligand pi systems is treated as the dominant pathway.

Evidence basis: multi_reference

Caveat: Through-space transport may occur in compact pi-pi stacks but is rarely observed in 2D MOFs.

1392 · Electrical properties

Author InterpretationMedium supportCaveat

Through-space charge transport is underexplored in 2D MOFs because compact stacked orbital-overlap pathways are structurally complex.

Evidence basis: single_reference

Caveat: The statement is a review-level inference from scarcity rather than a direct proof of absence.

1392 · Electrical properties

Author InterpretationMedium supportStructure Property Link

For 2D c-MOF topological insulators, controllable oxidation state and diverse frameworks are presented as advantages for controlling doping and electronic structure.

Evidence basis: multi_reference

Caveat: Much of the TI discussion is theoretical or potential-oriented.

1398 · Topological insulator

Secondary benchmarks

Every row remains visibly secondary and links to a primary dossier only where the mapping is verified.

MaterialPropertyReported valueContext and qualityPrimary evidenceReview source
SecondaryCu-BHT filmelectrical conductivityup to 1,580 S cm-1ambient conditions; thin film
Text · Exact Reported
research_00061393 · Electrical properties
SecondaryCu3(C6O6)2activation energyabout 0.46 eVsemiconducting behaviour from temperature-dependent conductivity
Text · Approximate
research_07921393 · Electrical properties
SecondaryCu3(HIB)2 pelletconductivity1,300 S m-1300 K under vacuum; pellet
Text · Exact Reported
No verified corpus mapping1393 · Electrical properties · Figure 2
SecondaryCu-BHT filmssuperconducting TcTc=0.25 Kelectrical resistivity, magnetic susceptibility and heat capacity; films
Text · Exact Reported
No verified corpus mapping1397 · Superconductor · Figure 7
SecondaryCu-BHT monolayercalculated superconducting Tc4.43 Kcalculated BCS superconductor; monolayer
Text · Exact Reported
No verified corpus mapping1397 · Superconductor · Figure 7
Secondary(Me2NH2)2[Fe2L3]magnetic ordering transition temperatureTc of 80 Kpristine tetraoxolene radical-based magnet
Text · Exact Reported
No verified corpus mapping1395 · Magnetic properties
SecondaryFe3(THT)2(NH4)3 filmmobility~220 cm2 V-1 s-1room temperature; TRTS and Hall effect used to demonstrate band-like transport
Text · Approximate
research_00011393 · Electrical properties
SecondaryFe-THTconductivity0.2 S cm-1300 K; high-quality Fe-THT
Text · Exact Reported
No verified corpus mapping1394 · Electrical properties · Figure 2
SecondaryK3Fe2[PcFe-O8]mobilityabout 15 cm2 V-1 s-1room temperature; TRTS measurements
Text · Approximate
research_02671396 · Magnetic properties · Figure 5
SecondaryMn benzoquinoid frameworkconductivity increase after reduction200,000-fold295 K; pristine to reduced framework
Text · Exact Reported
No verified corpus mapping1395 · Magnetic properties · Figure 4
SecondaryNi3(HIB)2 pelletconductivity800 S m-1300 K under vacuum; pellet
Text · Exact Reported
No verified corpus mapping1393 · Electrical properties · Figure 2
SecondaryNi3(HITP)2 FEThole mobility~48.6 cm2 V-1 s-1Ni3(HITP)2-based FET; holes primary carriers
Text · Approximate
research_00151392 · Electrical properties · Figure 1
SecondaryNi3(HITP)2 FETcurrent on/off ratio2x10^3Ni3(HITP)2-based FET
Text · Exact Reported
research_00151392 · Electrical properties · Figure 1
SecondaryNi3(HITP)2 filmroom-temperature conductivity40 S cm-1room temperature; van der Pauw method; film
Text · Exact Reported
No verified corpus mapping1392 · Electrical properties · Figure 1
Secondaryoxidized NiDTconductivity1.6x10^2 S cm-1300 K; van der Pauw method; oxidized NiDT
Text · Exact Reported
research_03611398 · Topological insulator · Figure 8
SecondaryLSMO/Cu3HHTP2/Co OSVmagnetoresistancenegative MR of 25%10 K; Cu3HHTP2 approximately 100 nm layer
Text · Exact Reported
research_01291396 · Magnetic properties · Figure 6
SecondaryPTC-Fe pelletsroom-temperature conductivityup to 10 S cm-1room temperature; pellets; semiconducting feature
Text · Exact Reported
research_00451395 · Magnetic properties · Figure 5
SecondaryPtDT single layercalculated Dirac gap0.054 eVband structure calculation; oxidized PtDT TI potential
Text · Exact Reported
No verified corpus mapping1398 · Topological insulator
Secondary(Cp2Co)1.43(Me2NH2)1.57[Fe2L3]magnetic ordering transition temperatureup to 105 Kpost-synthetically reduced framework
Text · Exact Reported
No verified corpus mapping1395 · Magnetic properties

Research gaps

Open questions are presented as review-author priorities, not conclusions from the primary database.

Charge and spin transport mechanisms

High

Intrinsic mechanisms for charge/spin transport among intralayer and interlayer pathways remain elusive.

Proposed direction: Combine conductivity, FP-TRMC, TRTS, UPS, Hall, Seebeck and theoretical calculations with better structural characterisation.

1399 · Challenges and opportunities

Future electronic and spintronic devices

High

Device fabrication procedures must be improved for future electronic and spintronic applications.

Proposed direction: Prepare higher-quality thin films and heterostructured COF-MOF or MOF-MOF composite films for multifunctional devices.

1400 · Challenges and opportunities

Film processing and device interfaces

High

Immature film processing and small granular nanoparticles impede 2D c-MOF device development.

Proposed direction: Improve interfacial synthesis, liquid-phase epitaxy, electrochemical deposition and solvo/hydrothermal film-processing routes.

1399 · Challenges and opportunities

Measurement validity for granular samples

High

Temperature-dependent conductivity alone is not proper for evaluating intrinsic electrical properties in granular samples.

Proposed direction: Prioritise single crystals, molecular models and multi-probe electronic-structure measurements.

1399 · Challenges and opportunities

Layer ordering and stacking control

High

Control of ordering and stacked layers is identified as the greatest synthetic challenge for 2D frameworks.

Proposed direction: Optimise additives, solvent, metal precursors, feed sequence, concentration, atmosphere, pressure and reaction time for larger single crystals and better ordered layers.

1398 · Challenges and opportunities

Performance versus inorganic 2D materials

Medium

2D c-MOF performance remains modest relative to state-of-the-art inorganic 2D materials with higher-temperature superconductivity or room-temperature magnetic ordering.

Proposed direction: Increase ligand conjugation, tune redox-active groups and ligand cores, and introduce lanthanide or 4d/5d metals for new functions.

1399 · Challenges and opportunities

Cu-BHT superconducting phase assignment

Medium

The review says the clear illustration of the second superconducting phase of Cu-BHT is missing.

Proposed direction: Use higher-quality single/few-layer samples and complementary superconductivity measurements to assign the second phase.

1399 · Challenges and opportunities

Single/few-layer intrinsic properties

High

Only few 2D c-MOFs have been prepared as highly crystalline atomic-thickness nanosheets, so intrinsic single-layer properties remain limited.

Proposed direction: Develop exfoliation, liquid-air interfacial synthesis and chemical vapour deposition routes for atom-thick 2D c-MOFs on substrates.

1399 · Challenges and opportunities

Stability and air sensitivity

Medium

Coordination-bond instability and redox-active groups limit use under harsh conditions and can cause air sensitivity.

Proposed direction: Design more robust coordination environments and account for air/redox effects during processing and measurement.

1399 · Challenges and opportunities

Accurate crystal structure and pathway assignment

High

Transport pathways depend on crystal structure, but polycrystalline powders often require indirect structure determination aided by simulations.

Proposed direction: Grow single crystals for diffraction and in-plane/out-of-plane transport measurements; use XRD, XAFS and HR-TEM with simulations for powders.

1399 · Challenges and opportunities

Cited-study map

Mappings show which printed review references have a verified counterpart in the frozen primary corpus.

Show 32 cited-study records
ReferenceStudyRole and contextCorpus mapping
Ref. 332019Title unavailablestructure_property_context · metallic_chalcogen_frameworkUsed for pi-d conjugation/chalcogen framework context and Cu-BHS metallic analogue discussion.Unmapped
Ref. 372016Title unavailabletransport_framework · review_contextSupports transport-mechanism framing and temperature-dependent transport interpretation.Unmapped
Ref. 402020Title unavailablethrough_space_contextCited for through-space charge transport context and its relative scarcity in 2D MOFs.research_0047
Ref. 422014Title unavailabletransport_benchmark · semiconductorFirst semiconductive 2D conjugated MOF example with room-temperature film conductivity.Unmapped
Ref. 432017Title unavailabledevice_benchmark · thin_filmAir-liquid interfacial Ni3(HITP)2 membrane and FET mobility/on-off benchmark.research_0015
Ref. 452018Title unavailabletransport_benchmark · semiconductorUsed for Cu3(C6O6)2 activation energy and bandgap benchmark.research_0792
Ref. 462018Title unavailabletransport_benchmark · measurement_caveatBand-like transport case where TRTS and Hall measurements are needed beyond conventional conductivity.research_0001
Ref. 472017Title unavailabletransport_benchmark · metallic_anisotropyBenzene-core HIB conductivity and UPS/DFT anisotropic electronic behaviour.Unmapped
Ref. 482015Title unavailabletransport_benchmark · metallic_behaviourCu-BHT thin-film high conductivity, ambipolar transport and metallic-behaviour evidence.research_0006
Ref. 492017Title unavailablemetallic_transitionCo-THT metallic transition behaviour upon cooling.Unmapped
Ref. 502019Title unavailabletransport_benchmark · redox_environmentFe-THT conductivity and air-oxidation-modulated semiconducting-to-metallic transition.Unmapped
Ref. 522019Title unavailablesingle_crystal · measurement_caveatSingle-crystal growth and grain-boundary caveat for intrinsic transport interpretation.Unmapped
Ref. 532016Title unavailabletheory · dimensionalityDFT dimensionality effect: sheet versus bulk transport character.Unmapped
Ref. 622015Title unavailablemagnetic_benchmark · porous_magnetFirst structurally characterised tetraoxolene radical-based magnet in the review.Unmapped
Ref. 632017Title unavailablemagnetic_benchmark · redox_switchingPost-synthetic reduction increasing intralayer spin coupling and Tc.Unmapped
Ref. 642019Title unavailablemagnetic_benchmark · redox_switchingRedox-switchable manganese framework with conductivity and magnetism change.Unmapped
Ref. 662018Title unavailableferromagnetic_semiconductor · transport_benchmarkPTC-Fe ferromagnetic semiconductor with high room-temperature conductivity.research_0045
Ref. 682019Title unavailablemagnetic_transport · mobility_benchmarkLayered phthalocyanine MOF with mobility, negative MR and high-temperature magnetic correlations.research_0267
Ref. 692020Title unavailablemagnetic_transport · selenol_frameworkCo-TPHS triphenylenehexaselenol framework with semiconductive behaviour and glassy magnetism after air exposure.Unmapped
Ref. 702019Title unavailablefilm_synthesis · magnetismVapour-induced conversion approach to conductive ferromagnetic Ni3(HITP)2 film.Unmapped
Ref. 712019Title unavailableredox_magnetism · semiconductorI2-doped NiTAA-MOF showing ligand-oxidation effects on magnetic and semiconducting behaviour.Unmapped
Ref. 722020Title unavailablespin_valve · device_benchmarkFirst 2D c-MOF organic spin valve cited by the review.research_0129
Ref. 732016Title unavailablespin_theoryRepresentative theoretical spin study noted before the review states mechanisms remain unresolved.Unmapped
Ref. 762019Title unavailablemolecular_model · spin_mechanismMolecular model compounds for intrinsic spin state and redox mechanism insight.research_0148
Ref. 822017Title unavailablesuperconductor_theory · quantum_materialTheoretical Cu-BHT superconductivity calculations.Unmapped
Ref. 832018Title unavailablesuperconductor_benchmark · crystallinityExperimental Cu-BHT nanoplate superconductivity and high crystallinity.Unmapped
Ref. 882013Title unavailabletopological_insulator_theoryTheoretical nontrivial topological states in 2D Ni3(BHT)2.Unmapped
Ref. 892014Title unavailabletopological_insulator_theoryQSH effect and Z2 metallic states in electron-doped Ni3(HITP)2 monolayer.Unmapped
Ref. 912013Title unavailableinterfacial_synthesis · redox_controlBottom-up interfacial synthesis of pi-conjugated nickel bis(dithiolene) nanosheets.Unmapped
Ref. 922014Title unavailableredox_control · topological_insulator_contextRedox control of NiDT with oxidised conductivity benchmark and metallic/semiconductor discrepancy.research_0361
Ref. 932019Title unavailabletopological_insulator_context · heavy_atom_effectPlatinum dithiolato analogue showing heavy-atom/SOC topological-insulator potential.Unmapped
Ref. 942019Title unavailablesynthesis_contextUsed for top-down versus bottom-up synthesis framing in the outlook.Unmapped