Primary studyCore evidenceTransport Physics

Utilization of counter anions for charge transportation in the electrical device fabrication of Zn(ii) metal-organic frameworks

Das K.S., Pal B., Saha S. et al. · Dalton Transactions · 2020 · 17005-17016

3materials
5samples
5synthesis routes
19measurements
57results
5claims and caveats

Evidence map

Open a family to keep every result attached to its sample, method and conditions.

Author interpretations and caveats

Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.

Application RelevanceSupport assessment: Medium

The authors use TGA to argue that both MOF networks have sufficient thermal stability for electrical-device fabrication.

Caveat: TGA values are not a direct operational stability test of the diode devices.

17010-17011 · TGA studies · Fig. 5 · Linked to 4 structured results

Phase AssignmentSupport assessment: Medium

PXRD patterns are used to confirm phase purity of both compounds and active layers before Schottky diode fabrication.

Caveat: The SI provides graphical PXRD comparisons but no numerical phase-fraction analysis.

17006 · Fabrication · ESI Fig. 4 and 5 · Linked to 2 structured results

Structure Property LinkSupport assessment: High

Compound 2 is claimed to perform better than compound 1 because it has higher conductivity, lower series resistance and lower barrier height.

Caveat: Device results are measured on spin-coated Schottky structures rather than free-standing single crystals.

17012-17013 · J-V and impedance analysis · Table 1; Table 2 · Linked to 4 structured results

Structure Property LinkSupport assessment: High

Changing the counter anion from BF4 to SO4 changes the framework: compound 1 has BF4-filled nanotubular pores, whereas compound 2 forms a self-interpenetrated framework with sulfate-water clusters.

17008-17009 · Structural description · Fig. 2; Fig. 3 · Linked to 4 structured results

Transport MechanismSupport assessment: High

The paper claims that anions or anion-water clusters inside cationic, otherwise insulating Zn-MOF frameworks mediate charge transportation.

Caveat: The authors acknowledge possible minor ionic contribution to current and anneal/measure under vacuum and glove-box conditions to minimise solvent/ionic artefacts.

17011 · Analysis of J-V characteristics · Fig. 6 · Linked to 4 structured results

Material identities

Names and aliases are kept exactly within the paper’s own identity model.

MaterialCompositionStructure contextSource
{[Zn(H2MBP)1.5](BF4)}n (compound 1)C21H24B2F8N12Zn; framework formula {[Zn(H2MBP)1.5](BF4)}nZn(II) atoms; octahedral ZnN6 coordination to six H2MBP molecules · 4,4'-methylene-bispyrazole (H2MBP), cis and trans conformers3D · PristineMonoclinic C 2/c cationic 3D framework with nanotubular pores occupied by BF4 counter anions; CCDC 2018311.17007-17008 · Structural description · Fig. 2
{[Zn3(H2MBP)4(H2O)4(SO4)3](H2O)7}n (compound 2)C56H104N32O44S6Zn6 in SI/CIF; framework formula {[Zn3(H2MBP)4(H2O)4(SO4)3](H2O)7}nZn(II) atoms with octahedral and trigonal bipyramidal geometries; sulfate-bound Zn nodes · 4,4'-methylene-bispyrazole (H2MBP), trans conformers3D · PristineMonoclinic P 21/c self-interpenetrated 3D framework with hollow tubular pores and extensive sulfate-water clusters; CCDC 2018312.17009 · Structural description · Fig. 3
4,4'-methylene-bispyrazole (H2MBP)C7H8N4H2MBP ligand used to construct compounds 1 and 20D · UnknownNeutral flexible bispyrazole ligand; monoclinic P 21/n crystal structure reported in SI and CIF.p002 · Synthesis and Characterization of H2MBP · Fig. SI 1; Table SI-1

Sample register

Sample form, processing state and composition status define the context for measurements.

Show 5 sample records
SampleForm and roleProcessing and geometrySource
compound 1 crystalsresearch_0405__mat__mat_compound1Single Crystal · Target Sample · Guest Loadedtiny block-shaped white crystals, washed with water-methanol (1:1) and dried in air17006 · Synthesis of {[Zn(H2MBP)1.5](BF4)}n (1)
ITO/compound 1/Al Schottky dioderesearch_0405__mat__mat_compound1Thin Film · Target Sample · Guest Loadedcompound 1 DMF solution ultrasonicated, spin-coated on ITO at 1000 rpm, dried in hot air oven, Al deposited under 10^-6 TorrITO-coated glass with evaporated Al top contact · Al metal thickness around 1 um; active MOF-film thickness not reported17006 · Fabrication of ITO/synthesized zinc-based MOF/Al-based Schottky barrier diodes · Fig. 1
compound 2 crystalsresearch_0405__mat__mat_compound2Single Crystal · Target Sample · Guest Loadedwhite block-shaped crystals obtained by route similar to compound 1 with ZnSO4.7H2O and mild heating17006 · Synthesis of {[Zn3(H2MBP)4(H2O)4(SO4)3](H2O)7}n (2)
ITO/compound 2/Al Schottky dioderesearch_0405__mat__mat_compound2Thin Film · Target Sample · Guest Loadedcompound 2 DMF solution ultrasonicated, spin-coated on ITO at 1000 rpm, dried in hot air oven, Al deposited under 10^-6 TorrITO-coated glass with evaporated Al top contact · Al metal thickness around 1 um; active MOF-film thickness not reported17006 · Fabrication of ITO/synthesized zinc-based MOF/Al-based Schottky barrier diodes · Fig. 1
H2MBP recrystallised productresearch_0405__mat__mat_h2mbpSingle Crystal · Paper Level Unspecified · Unknownrecrystallised from absolute ethanol after hot-water dissolution, neutralisation, filtration, washing and dryingp002 · Synthesis and Characterization of H2MBP · Fig. SI 1