Vinylene-Linked Covalent Organic Frameworks by Base-Catalyzed Aldol Condensation.

ABSTRACT: Two 2D covalent organic frameworks (COFs) linked by vinylene (-CH=CH-) groups (V-COF-1 and V-COF-2) are synthesized by exploiting the electron deficient nature of the aromatic s-triazine unit of C₃ -symmetric 2,4,6-trimethyl-s-triazine (TMT). The acidic terminal methyl hydrogens of TMT can easily be abstracted by a base, resulting in a stabilized carbanion, which further undergoes aldol condensation with multitopic aryl aldehydes to be reticulated into extended crystalline frameworks (V-COFs). Both V-COF-1 (with terepthalaldehyde (TA)) and V-COF-2 (with 1,3,5-tris(p-formylphenyl)benzene (TFPB)) are polycrystalline and exhibit permanent porosity and BET surface areas of 1341 m²  g^-1 and 627 m²  g^-1 , respectively. Owing to the close pro

SUBMITTER: Acharjya A 

PROVIDER: S-EPMC6851556 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature