4,4',4'',4'''-(9H-Carbazole-1,3,6,8-tetrayl)tetrabenzoic acid, known as H4CzTB, is a tetracarboxylic acid ligand used to construct metal-organic frameworks (MOFs). Its carbazole core carries four 4-benzoic acid arms at the 1, 3, 6 and 8 positions, giving the molecule a star-shaped geometry suited to linking metal clusters.
This linker has been used with Fe3O clusters to form the mesoporous framework PCN-668, which combines nanoscale cage-like building units with one-dimensional (1D) channels, where adjacent cages are mutual diastereomers. Exchanging the metal to chromium after synthesis improves acid stability: PCN-668-Cr remains highly stable in acidic and basic aqueous solutions across pH = 1–11. The mesoporous framework also reached a total gravimetric methane uptake of ∼ 500 cm3 g-1 at 100 bar.
The material is supplied as a pale yellow powder or crystal with a purity of >97%, in 500 mg, 1 g and 5 g pack sizes.
- Ligand linker for synthesising iron-based tetracarboxylate MOFs such as PCN-668.
- Building mesoporous frameworks studied for gravimetric methane adsorption.
- Preparing chemically stable MOFs through post-synthetic metal exchange to chromium.
- Research on stable metal-organic frameworks, including work on PEC water splitting.
| Brand | Ossila |
|---|---|
| CAS number | 2097131-99-0 |
| Molecular formula | C40H25O8 |
| Purity | >97% |
| Category | — |
| Pack sizes | 500 mg, 1 g, 5 g |
| Physical form | Pale yellow powder/crystal |
| Storage | — |
- Product code: B3071
- Molecular Weight: 647.63 g/mol
- Synonyms: H4CzTB, H4BDC, 4-[1,6,8-tris(4-carboxyphenyl)-9H-carbazol-3-yl]-Benzoic acid
- Classification / Family: Carbazoles, MOF ligands
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