Premium
A Phosphate‐Based Silver–Bipyridine 1D Coordination Polymer with Crystallized Phosphoric Acid as Superprotonic Conductor
Author(s) -
Pal Arun,
Pal Shyam Chand,
Otsubo Kazuya,
Lim DaeWoon,
Chand Santanu,
Kitagawa Hiroshi,
Das Madhab C.
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201905650
Subject(s) - phosphoric acid , proton conductor , molecule , crystallization , conductivity , coordination polymer , crystallography , materials science , polymer , inorganic chemistry , phosphate , hydrothermal circulation , octahedron , hydrogen bond , proton , crystal structure , chemistry , chemical engineering , organic chemistry , electrode , electrolyte , physics , quantum mechanics , engineering
Abstract Phosphate‐based silver–bipyridine (Ag‐bpy) 1D coordination polymer {[{Ag(4,4′‐bpy)} 2 {Ag(4,4′‐bpy)(H 2 PO 4 )}] ⋅ 2 H 2 PO 4 ⋅ H 3 PO 4 ⋅ 5 H 2 O} n ( 1 ) with free phosphoric acid (H 3 PO 4 ), its conjugate base (H 2 PO 4 − ) and water molecules in its lattice was synthesized by room‐temperature crystallization and the hydrothermal method. An XRD study showed that coordinated H 2 PO 4 − , lattice H 2 PO 4 − anions, free H 3 PO 4 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.