Sadakiyo M., Yamada T., Honda K. et al. · Journal of the American Chemical Society · 2014 · 7701-7707
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 framework reversibly transforms among anhydrate 1, dihydrate 1·2H2O and trihydrate 1·3H2O depending on water content.
Caveat: Hydrogen atom positions are limited by SCXRD; CIF files were not available locally.
7704 · Structural Analysis · Figures 1, 4, 5; Table 1 · Linked to 4 structured results
Anhydrate 1 shows negligible N2 uptake despite strong water adsorption, consistent with a narrow interlayer accessible to smaller water molecules and hydrogen bonding.
Caveat: The small numerical N2 uptake was visually estimated from SI Figure S1.
7703 · Structural Analysis · Figure S1 · Linked to 2 structured results
Guest water adsorption/desorption reforms hydrogen-bonding networks and controls proton conductivity over about ten orders of magnitude.
Caveat: Intermediate humidity conductivities are primarily graphical except for the key phase values reported in text.
7705 · Proton Conduction · Figure 7 · Linked to 6 structured results
The authors hypothesise a Grotthuss-type mechanism in 1·3H2O because a vehicle mechanism is unlikely in the confined interlayer space.
Caveat: The paper explicitly states that SCXRD and conductivity measurements have limited ability to resolve hydrogen motion, and further neutron scattering was ongoing.
7705 · Proton Conduction · Figure 5 · Linked to 3 structured results
The microwave response is attributed to rotational or vibrational molecular motions embedded in the framework rather than direct proton conduction.
Caveat: The microscopic motion is inferred; hydrogen-atom dynamics were not directly observed.
7706 · Proton Conduction · Figure 8 · Linked to 3 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| 1·2H2O | (NH4)2(adp)[Zn2(ox)3]·2H2O; C12H22N2O18Zn2Zn2+ oxalate-bridged honeycomb 2-D layers, [Zn2(ox)3]2- · oxalate (ox) in framework; adipic acid/adipate species (adp) in honeycomb void/interlayer | 2D · PristineDihydrate phase with monoclinic P21/c space group; water and ammonium ions alternate in the interlayer, forming weaker hydrogen bonds than in 1·3H2O. | 7703 · Structural Analysis · Table 1; Figure 4 |
| 1·3H2O | (NH4)2(adp)[Zn2(ox)3]·3H2O; C12H24N2O19Zn2Zn2+ oxalate-bridged honeycomb 2-D layers, [Zn2(ox)3]2- · oxalate (ox) in framework; adipic acid/adipate species (adp) in honeycomb void/interlayer | 2D · PristineTrihydrate phase with triclinic P-1 crystal system and 2-D hydrogen-bonding networks containing ammonium ions, water molecules and adipic-acid carboxyl groups. | 7701 · Abstract |
| 1 | (NH4)2(adp)[Zn2(ox)3]; C12H18N2O16Zn2Zn2+ oxalate-bridged honeycomb 2-D layers, [Zn2(ox)3]2- · oxalate (ox) in framework; adipic acid/adipate species (adp) in honeycomb void/interlayer | 2D · PristineAnhydrate phase with monoclinic P21/c space group; no interlayer water molecules and no continuous hydrogen-bonding network in the interlayer. | 7703 · Structural Analysis · Table 1; Figure 4 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| air-dried 1·2H2O sampleresearch_0324__mat__mat_1_2h2o | Powder · Target Sample · Guest Loaded | air-dried from 1·3H2O after washing with distilled water | 7702 · Experimental Section |
| single crystal of 1·2H2Oresearch_0324__mat__mat_1_2h2o | Single Crystal · Target Sample · Guest Loaded | single crystal picked from air-drying samples of 1·3H2O | 7702 · Crystal Structure Determination |
| as-synthesised 1·3H2O crystalsresearch_0324__mat__mat_1_3h2o | Single Crystal · Target Sample · Guest Loaded | crystals kept in mother liquid or high-humidity hydrated state | 7702 · Experimental Section |
| dehydrated 1 for sorption measurementsresearch_0324__mat__mat_1_anhydrate | Powder · Target Sample · Pristine Framework | thoroughly dehydrated by heating at 80 °C overnight before water and nitrogen adsorption | 7702 · Physical Measurements |
| pressed pellet of anhydrate 1research_0324__mat__mat_1_anhydrate | Pellet · Target Sample · Pristine Framework | pellet of 1 prepared by heating a pellet of 1·2H2O under vacuum; measured at 0% RH under helium~0.6 mm thickness x 2.5 mm diameter | 7702 · Physical Measurements |
| dehydrated anhydrate 1 single crystalresearch_0324__mat__mat_1_anhydrate | Single Crystal · Target Sample · Pristine Framework | 1·2H2O single crystal dried at 50 °C overnight under N2 flow before SCXRD | 7702 · Crystal Structure Determination |
| pressed pellets of hydrated 1·nH2Oresearch_0324__mat__mat_1_2h2o | Pellet · Target Sample · Guest Loaded | powdered crystals pressed under ~1.2 GPa and contacted with gold electrodes~0.6 mm thickness x 2.5 mm diameter | 7702 · Physical Measurements |