Ossila 4,4',4'',4'''-([1,1'-Biphenyl]-4,4'-diylbis(azanetriyl))tetrabenzaldehyde B4191

4,4',4'',4'''-([1,1'-Biphenyl]-4,4'-diylbis(azanetriyl))tetrabenzaldehyde, also known as BDTB or N,N,N',N'-Tetra(4-formylphenyl)benzidine (CAS 865448-72-2), is a tetraphenylbenzidine building block bearing four aldehyde groups. Its tetratopic shape makes it a common monomer for constructing imine-linked covalent organic frameworks (COFs) and cross-linked COF/MOF networks.

When combined with porphyrin, this ligand yields COFs that act as heterogeneous photocatalysts for reversible addition-fragmentation chain-transfer (RAFT) polymerization driven by photoinduced electron transfer. Frameworks built from it have also been used for hydrogen evolution from water, reaching rates up to 10 mmol/g·h, and for two-photon absorption with a cross-section value of 8756 GM/chromophore.

The aldehyde groups offer excellent reactivity for framework synthesis. Ossila supplies the material as a yellow powder with purity > 98%, with a molecular weight of 600.66 g/mole.

• Synthesis of imine-linked covalent organic frameworks (COFs) as a tetratopic aldehyde monomer.
• Preparation of porphyrin-based COF photocatalysts for PET-RAFT polymerization.
• Development of COFs for photocatalytic hydrogen evolution from water.
• Research on COF materials for two-photon absorption.
• Construction of cross-linked COF/MOF networks.

• Product code: B4191
• Full Name: 4,4',4'',4'''-(4,4'-Biphenyldiyldinitrilo)tetrabenzaldehyde
• M​olecular Weight: 600.66 g/mole
• Synonyms: N,N,N',N'-Tetra(4-formylphenyl)benzidine, BDTB, BDTA
• Classification or Family: Porous organic frameworks, COFs, Aldehydes, Tetraphenylbenzidines

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