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Phosphoric Acid Loaded Azo (−N═N−) Based Covalent Organic Framework for Proton Conduction

2014; American Chemical Society; Volume: 136; Issue: 18 Linguagem: Inglês

10.1021/ja502212v

1943-2984

Suman Chandra, Tanay Kundu, Sharath Kandambeth, Ravichandar Babarao, Yogesh N. Marathe, Shrikant M. Kunjir, Rahul Banerjee,

Fuel Cells and Related Materials

Two new chemically stable functional crystalline covalent organic frameworkds (COFs) (Tp-Azo and Tp-Stb) were synthesized using the Schiff base reaction between triformylphloroglucinol (Tp) and 4,4'-azodianiline (Azo) or 4,4'-diaminostilbene (Stb), respectively. Both COFs show the expected keto-enamine form, and high stability toward boiling water, strong acidic, and basic media. H3PO4 doping in Tp-Azo leads to immobilization of the acid within the porous framework, which facilitates proton conduction in both the hydrous (σ = 9.9 × 10(-4) S cm(-1)) and anhydrous state (σ = 6.7 × 10(-5) S cm(-1)). This report constitutes the first emergence of COFs as proton conducting materials.