Ayhan M.M., Bayraktar C., Yu K.B. et al. · Chemistry - A European Journal · 2020 · 14813-14816
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 authors suggest GTUB-4 could be used as an electrode material for next-generation supercapacitors because of its narrow bandgap and high surface area.
Caveat: No electrochemical supercapacitor or electrode measurement is reported in this paper.
3 · Summary · Linked to 3 structured results
The narrow bandgap is attributed to extended conjugation mediated by the mono-deprotonated phosphonate metal-binding unit and the conjugated porphyrin core.
Caveat: Mechanistic attribution is interpretive; the paper reports optical evidence but no direct charge-transport pathway measurement.
3 · Bandgap discussion · Linked to 2 structured results
GTUB-4 is presented as a high-surface-area phosphonate MOF with geometric accessible surface area of 1102 m2/g.
Caveat: Surface area is computational/geometric N2-accessible surface area, not an experimental BET measurement.
1 · Abstract · Linked to 3 structured results
Strict pH, temperature and solvent control were required to obtain the simple 1.100 phosphonate metal-binding mode and the one-dimensional tubular GTUB-4 structure.
Caveat: The claim is based on the authors' synthetic rationale and structural outcome; no systematic optimisation table is reported.
2 · Synthesis and structure discussion · Linked to 1 structured result
GTUB-4 is proposed to be a semiconductor because its optical bandgap is narrow, with the indirect bandgap reported as 1.9 eV.
Caveat: No direct electrical conductivity measurement is reported; the direct Tauc fit is explicitly described as unsatisfactory in the SI.
3 · Summary · Figure 3 · Linked to 3 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Cu-H8TPPA copper porphyrin phosphonic acid precursor | Cu-H8TPPACu(II) incorporated into the porphyrin core · 5,10,15,20-tetrakis[p-phenylphosphonic acid] porphyrin | 0D · UnknownMolecular copper porphyrin precursor used to synthesise GTUB-4. | 2 · Synthesis of Copper 5,10,15,20-Tetrakis [p-phenylphosphonic acid] porphyrin · Figure S1 |
| GTUB-4 nanotubular phosphonate MOF | [Ni(Cu-H4TPPA)].2(CH3)2NH2+; refinement model C48H48CuN6NiO14P4octahedral Ni(II) phosphonate nodes linking Cu-porphyrin phosphonate units; square-planar Cu(II) in porphyrin core · Cu-H4TPPA4- derived from copper 5,10,15,20-tetrakis[p-phenylphosphonic acid] porphyrin | 1D · PristineOne-dimensional nanotubular MOF with rectangular and hexagonal void channels; nanotubes hydrogen-bonded into a three-dimensional framework and cross-packed at 41.87 degrees. | 1 · Abstract |
| H8-TPPA free-base porphyrin phosphonic acid ligand | H8-TPPA5,10,15,20-tetrakis[p-phenylphosphonic acid] porphyrin | 0D · UnknownMolecular free-base porphyrin ligand/precursor. | 2 · Materials and equipment · Figure S1 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| Cu-H8TPPA red solidresearch_0782__mat__cu_h8tppa_precursor | Powder · Pristine Control · Unknown | Metalation product after solvent evaporation and sequential washing with ethyl alcohol, ethyl acetate and acetone. | 2 · Synthesis of Copper 5,10,15,20-Tetrakis [p-phenylphosphonic acid] porphyrin |
| GTUB-4 dark red needle-like crystalsresearch_0782__mat__gtub4_mof | Single Crystal · Target Sample · Pristine Framework | Sealed-vial solvothermal product; dark red needle-like crystals obtained, with hand-picked crystals used for TGA and crystalline material used for DRS. | 3 · Synthesis of GTUB-4 |
| GTUB-4 crystallographic fixed-atom simulation cellresearch_0782__mat__gtub4_mof | Model · Model System · Model | GTUB-4 unit cell replicated 3 x 1 x 1 in RASPA with framework atoms fixed in crystallographically determined positions. | 7 · Molecular simulations |
| H8-TPPA free-base porphyrin derivativeresearch_0782__mat__h8_tppa_ligand | Powder · Pristine Control · Unknown | Previously prepared free-base porphyrin derivative used for metalation and spectroscopy comparison. | 2 · Synthesis of Copper 5,10,15,20-Tetrakis [p-phenylphosphonic acid] porphyrin |