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Updated: Dec 31, 2025
Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
Published on: November 22, 2016
A Phosphate-Based Silver-Bipyridine 1D Coordination Polymer with Crystallized Phosphoric Acid as Superprotonic
Arun Pal1, Shyam Chand Pal1, Kazuya Otsubo2
1Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, WB, 721302, India.
Abstract:
Phosphate-based silver-bipyridine (Ag-bpy) 1D coordination polymer {[{Ag(4,4'-bpy)}2 {Ag(4,4'-bpy)(H2 PO4 )}]⋅2 H2 PO4 ⋅H3 PO4 ⋅5 H2 O}n (1) with free phosphoric acid (H3 PO4 ), its conjugate base (H2 PO4 - ) and water molecules in its lattice was synthesized by room-temperature crystallization and the hydrothermal method. An XRD study showed that coordinated H2 PO4 - , lattice H2 PO4 - anions, free H3 PO4 and lattice water molecules are interconnected by H-bonding interactions, forming an infinitely extended 2D H-bonded network that facilitates proton transfer. This material exhibits a high proton conductivity of 3.3×10-3 S cm-1 at 80 °C and 95 % relative humidity (RH). Furthermore, synthesis of this material from commercially available starting materials in water can be easily scaled up, and it is highly stable under extreme conditions of conductivity measurements. This report inaugurates the usage and design principle of proton-conducting frameworks based on crystallized phosphoric acid and phosphate.
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