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Phosphoric Acid Loaded Azo (-N═N-) Based Covalent Organic Framework For Proton Conduction.

S. Chandra, T. Kundu, S. Kandambeth, R. Babarao, Y. Marathe, Shrikant M. Kunjir, R. Banerjee
Published 2014 · Chemistry, Medicine

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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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