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4,4'-(Benzo[c][1,2,5]thiadiazole-4,7-diyl)dianiline, commonly abbreviated BTDA (CAS 1203707-77-0), is a diamine building block used to construct covalent organic frameworks (COFs) and other cross-linked networks. Its structure pairs an electron-poor benzo[c][1,2,5]thiadiazole centre with aniline groups attached at the 4 and 7 positions, making it a useful acceptor unit in donor–acceptor materials. The terminal amines react readily, for example in Schiff-base condensations with aldehydes.
Published work shows its range. Combined with the calix[4]arene donor CHO-C4A, it forms the 2D framework COF-C4A-BTD, which removed bisphenol A, rhodamine B and methylene blue at 66%, 85% and 99% respectively. Condensation with 1,3,5-triformylphloroglucinol gives CoNi–COF-3, reported to produce CO from CO2 at 2567 μmol g –1 h –1 with 92.2% selectivity.
A one-step Schiff reaction with 4-(diethylamino)-salicylaldehyde yields DSABBT, an aggregation-induced emission probe with strong singlet oxygen generation, studied for image-guided photodynamic therapy. Ossila supplies BTDA as an orange to red powder or crystals at >98% purity.
- Amine linker for synthesising crystalline, porous covalent organic frameworks and cross-linked COF/MOF networks.
- Acceptor building block in donor–acceptor COFs for visible-light photocatalytic degradation of organic pollutants.
- Precursor for COF photocatalysts studied in photocatalytic CO2 reduction.
- Ligand for 2D COFs used in cooperative photocatalytic aerobic oxidation of benzyl amines.
- Starting material for aggregation-induced emission fluorescent probes and photosensitisers for photodynamic therapy research.
- Building block for COF isomers investigated for photoenhanced gold recovery from e-waste.
| Brand | Ossila |
|---|---|
| CAS number | 1203707-77-0 |
| Molecular formula | C18H14N4S |
| Purity | >98% |
| Category | — |
| Pack sizes | 500 mg, 1 g, 5 g |
| Physical form | Orange to red powder/crystals |
| Storage | — |
- Product code: B3901
- Molecular Weight: 318.4 g/mol
- Synonyms: BTDA, 4,7-Bis(aminophenyl)-2,1,3-benzothiadiazole, 4,4'-(2,1,3-Benzothiadiazole-4,7-diyl)bisbenzeneamine
- Classification / Family: Benzo[c][1,2,5]thiadiazoles, COF ligands
- Melting Point: 247 – 248 °C
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