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- Title
A Phosphate‐Based Silver–Bipyridine 1D Coordination Polymer with Crystallized Phosphoric Acid as Superprotonic Conductor.
- Authors
Pal, Arun; Pal, Shyam Chand; Otsubo, Kazuya; Lim, Dae‐Woon; Chand, Santanu; Kitagawa, Hiroshi; Das, Madhab C.
- Abstract
Phosphate‐based silver–bipyridine (Ag‐bpy) 1D coordination polymer {[{Ag(4,4′‐bpy)}2{Ag(4,4′‐bpy)(H2PO4)}]⋅2 H2PO4⋅H3PO4⋅5 H2O}n (1) with free phosphoric acid (H3PO4), its conjugate base (H2PO4−) and water molecules in its lattice was synthesized by room‐temperature crystallization and the hydrothermal method. An XRD study showed that coordinated H2PO4−, lattice H2PO4− anions, free H3PO4 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.
- Subjects
SUPERPHOSPHATES; PROTON conductivity; HYDROTHERMAL synthesis; COORDINATION polymers; PHOSPHORIC acid; HUMIDITY; WATER
- Publication
Chemistry - A European Journal, 2020, Vol 26, Issue 20, p4607
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201905650