Phosphoric Acid Loaded Azo (−N═N−) Based Covalent Organic Framework for Proton Conduction
Journal of the American Chemical Society2014Vol. 136(18), pp. 6570–6573
Citations Over TimeTop 1% of 2014 papers
Suman Chandra, Tanay Kundu, Sharath Kandambeth, Ravichandar Babarao, Yogesh N. Marathe, Shrikant Kunjir, Rahul Banerjee
Abstract
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.
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