Levenson D.A., Zhang J., Gelfand B.S. et al. · Dalton Transactions · 2020 · 4022-4029
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.
The hydrogen-bonding network appears mostly available to charge carriers travelling along the a-axis, although the preferred pathway cannot be determined without single-crystal conductivity measurements.
Caveat: Authors explicitly state the preferred pathway cannot be determined without single-crystal measurements.
p003 / journal page 4024 · Synthesis and structural analysis of PCMOF21-AcO crystals · Figure 1 · Linked to 2 structured results
PCMOF21-AcO retains crystallinity under 95% RH for one month up to 85 deg C, but is not stable in boiling water or after standing in water.
Caveat: Based on PXRD peak changes rather than full post-treatment structural refinement.
p004 / journal page 4025 · Flexibility and water stability of PCMOF21-AcO · Figure S12 · Linked to 2 structured results
Larger PCMOF21-AcO particles conduct protons better, supporting that grain boundaries are a hurdle to proton conduction rather than an enabler.
Caveat: Particle-size distribution is inhomogeneous and laser particle analysis may overestimate large particles; morphology assumptions are discussed by the authors.
p006 / journal page 4027 · Conclusions · Linked to 4 structured results
The activation energy of 0.338 eV for as-synthesised PCMOF21-AcO indicates a likely Grotthuss proton-transfer mechanism.
Caveat: Mechanistic assignment is inferred from activation energy rather than directly measured proton dynamics.
p005 / journal page 4026 · Proton conduction by particle size · Table 2 · Linked to 1 structured result
Variation of pelletisation pressure confirms that the single semicircle observed in AC impedance represents combined bulk and grain-boundary contributions.
Caveat: Torque series was measured on representative beta-PCMOF21-Br rather than PCMOF21-AcO itself, though authors state it shares similar structure and morphology.
p006 / journal page 4027 · Conclusions · Linked to 3 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| beta-PCMOF21-Br | not reported in supplied paper; beta-phase HBr/bromide adduct of the PCMOF21 seriesLa phosphonate PCMOF21-series framework inferred by authors as structurally and morphologically similar to PCMOF21-AcO. · PCMOF21 cationic phosphonate linker framework; precise composition not stated in this article. | 3D · PristineRepresentative PCMOF21-series beta-phase bromide/HBr adduct used for pelletisation-pressure conductivity control. | p003 / journal page 4024 · Proton conductivity torque measurements |
| PCMOF21-AcO | La2(H2L)1.5(AcO)3.(H2O)5.59; CIF formula C22H46La2N3O15P3Two crystallographically distinct 9-coordinate La(III) ions with phosphonate, acetate and aqua coordination. · H2L from N,N'-4,4'-bipiperidinebis(methylenephosphonic acid); cationic bis(phosphonomethyl)bipiperidinium phosphonate linker. | 3D · Pristine3D cationic lanthanum phosphonate MOF with coordinated and free acetate counter-anions; PXRD and elemental analysis confirm bulk powder correlates with the single-crystal structure. | p001 / journal page 4022 · Abstract |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| beta-PCMOF21-Br torque-control pelletresearch_0676__mat__mat_beta_pcmof21_br | Pellet · Model System · Pristine Framework | Equal portions of the same beta-PCMOF21-Br sample loaded into sample holders and equilibrated at different torque values under 95% RH. | p003 / journal page 4024 · Proton conductivity torque measurements |
| as-synthesised PCMOF21-AcO bulk powderresearch_0676__mat__mat_pcmof21_aco | Powder · Target Sample · Pristine Framework | White powder from aqueous reflux; filtered hot, washed with water, stored in a vacuum desiccator; unsieved full particle distribution. | p002 / journal page 4023 · Synthesis of PCMOF21-AcO |
| PCMOF21-AcO >210 um particle fractionresearch_0676__mat__mat_pcmof21_aco | Pellet · Target Sample · Pristine Framework | Largest fraction retained above the 210 um sieve and measured as compressed pellet at 0.4 N m. | p004 / journal page 4025 · Particle sieving · Figure 3 |
| PCMOF21-AcO 125 <= x < 180 um particle fractionresearch_0676__mat__mat_pcmof21_aco | Pellet · Target Sample · Pristine Framework | Intermediate sieved fraction collected from the nested sieve stack and measured as compressed pellet at 0.4 N m. | p005-p006 / journal pages 4026-4027 · SEM discussion · Figure S2 |
| PCMOF21-AcO sieved particle-fraction seriesresearch_0676__mat__mat_pcmof21_aco | Powder · Paper Level Unspecified · Pristine Framework | paper_level_unspecified | p002 / journal page 4023 · Particle sieving and collection · Figure 3 |
| PCMOF21-AcO single crystalsresearch_0676__mat__mat_pcmof21_aco | Single Crystal · Target Sample · Pristine Framework | Hydrothermally grown crystals kept in mother liquor and mechanically separated from surrounding crystalline powder.crystal size 0.308 x 0.157 x 0.084 mm | p002 / journal page 4023 · Single crystal synthesis of PCMOF21-AcO |
| PCMOF21-AcO <38 um particle fractionresearch_0676__mat__mat_pcmof21_aco | Pellet · Target Sample · Pristine Framework | Bulk powder sieved through nested 210, 180, 125, 74 and 38 um sieves; <38 um fraction measured as compressed pellet at 0.4 N m. | p004 / journal page 4025 · Particle sieving · Figure 3 |