Kang L.-L., Xing C., Jin Y.-X. et al. · Inorganic Chemistry · 2023 · 3036-3046
Open a family to keep every result attached to its sample, method and conditions.
Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.
Both MOFs operate as room-temperature impedance sensors for volatile amines under humid conditions, with highest responses at 68% RH and sub-ppm to 1 ppm detection limits.
Caveat: Gas response is humidity-dependent and dry-air controls show no volatile-amine sensing capability.
3041-3044 · Sensing Properties / Conclusions · Tables 2-3 · Linked to 2 structured results
DUT-67(Zr) and DUT-67(Hf) are high-performing pristine proton-conductive MOFs, reaching 2.98e-3 and 3.86e-3 S cm^-1 at 100 deg C and 98% RH.
Caveat: Conductivity is protonic/humidity-assisted rather than intrinsic electronic conductivity; Table 1 has a condition typo for Hf.
3036/3040 · Abstract / Proton Conduction · Tables S1-S2 cited · Linked to 2 structured results
DUT-67(Zr) and DUT-67(Hf) retain their PXRD patterns after water, acid/base, and post-sensing treatments, supporting their use in humid proton conduction and sensing.
Caveat: Stability conclusion is mainly PXRD/SEM-based; local defect changes are not excluded.
3038-3039/3042 · Structural Stabilities / Sensing Properties · Figures 2, 3, S14, S15 · Linked to 6 structured results
Defective/unsaturated metal sites and stronger Hf-O bonding are proposed to make DUT-67(Hf) more Bronsted acidic and more conductive than DUT-67(Zr).
Caveat: Defects are inferred from TGA-normalised mass discrepancy and structural reasoning; no independent defect quantification is tabulated.
3040 · Proton Conduction · Figures S9-S10 · Linked to 2 structured results
At high RH, low Ea values support a Grotthuss-type proton-transfer mechanism, whereas higher Ea at 68% RH is assigned to a Vehicle mechanism.
Caveat: Mechanistic assignment is based on fitted activation energies and literature thresholds, not direct proton-motion observation.
3040 · Proton Conduction · Figure 5 · Linked to 4 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| DUT-67(Hf) | Hf6O8(TDC)6 idealised; TGA discussion suggests missing TDC ligand defectsSix octahedral Hf(IV) cations interlinked by eight mu3-O atoms; stronger Hf-O bond/smaller Hf4+ radius discussed · 2,5-thiophene dicarboxylate (TDC2-) from 2,5-thiophene dicarboxylic acid (H2TDC) | 3D · PristineIsostructural cubic Fm-3m DUT-67 framework with reo topology. | 3037-3038 · Introduction / Results and Discussion · Figure 1 |
| DUT-67(Zr) | Zr6O8(TDC)6 idealised; TGA discussion suggests missing TDC ligand defectsSix octahedral Zr(IV) cations interlinked by eight mu3-O atoms; unsaturated Zr Lewis acid sites/defects discussed · 2,5-thiophene dicarboxylate (TDC2-) from 2,5-thiophene dicarboxylic acid (H2TDC) | 3D · PristineCubic Fm-3m DUT-67 framework with reo topology; each SBU joined by eight TDC2- anions. | 3038 · Results and Discussion - Structural Analysis · Figure 1 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| Methanol-activated DUT-67(Hf) powderresearch_0832__mat__dut67_hf | Powder · Target Sample · Pristine Framework | Powder soaked in methanol for 72 h with methanol changed three times per day; filtered solids dried under vacuum at 80 deg C for 10 h. | 3037 · Experimental Section - Sample Activation |
| DUT-67(Hf) pressed pellet with platinum electrodesresearch_0832__mat__dut67_hf | Pellet · Target Sample · Pristine Framework | Pellet equilibrated at selected RH values for 20 h before AC impedance measurement.pair of platinum electrodes · about 35 mg powder pressed at 3 MPa for 4 min | 3037 · Experimental Section - Proton Conductivity Test |
| DUT-67(Hf) microcrystalline powderresearch_0832__mat__dut67_hf | Powder · Target Sample · Pristine Framework | White crystalline solids, washed with DMF and EtOH, then dried at 80 deg C for 12 h. | 3037 · Experimental Section - Preparations |
| DUT-67(Hf) impedance gas-sensing pellet between Pt mesh electrodesresearch_0832__mat__dut67_hf | Electrode · Target Sample · Pristine Framework | Particles/pellet placed in Pt mesh electrodes and hung in the gas-sensing chamber under controlled RH and temperature.Pt mesh electrodes in test chamber | SI p018-p019 · Experimental Details of Impedance Gas Sensing Experiments · Figure S20 |
| Methanol-activated DUT-67(Zr) powderresearch_0832__mat__dut67_zr | Powder · Target Sample · Pristine Framework | Powder soaked in methanol for 72 h with methanol changed three times per day; filtered solids dried under vacuum at 80 deg C for 10 h. | 3037 · Experimental Section - Sample Activation |
| DUT-67(Zr) pressed pellet with platinum electrodesresearch_0832__mat__dut67_zr | Pellet · Target Sample · Pristine Framework | Pellet equilibrated at selected RH values for 20 h before AC impedance measurement.pair of platinum electrodes · about 35 mg powder pressed at 3 MPa for 4 min | 3037 · Experimental Section - Proton Conductivity Test |
| DUT-67(Zr) microcrystalline powderresearch_0832__mat__dut67_zr | Powder · Target Sample · Pristine Framework | White crystalline solids, washed with DMF and EtOH, then dried at 80 deg C for 12 h. | 3037 · Experimental Section - Preparations |
| DUT-67(Zr) impedance gas-sensing pellet between Pt mesh electrodesresearch_0832__mat__dut67_zr | Electrode · Target Sample · Pristine Framework | Particles/pellet placed in Pt mesh electrodes and hung in the gas-sensing chamber under controlled RH and temperature.Pt mesh electrodes in test chamber | SI p018-p019 · Experimental Details of Impedance Gas Sensing Experiments · Figure S20 |