A Phosphate‐Based Silver–Bipyridine 1D Coordination Polymer with Crystallized Phosphoric Acid as Superprotonic Conductor. Issue 20 (19th March 2020)

• Record Type: Journal Article
• Authors: Pal, Arun; Pal, Shyam Chand; Otsubo, Kazuya; Lim, Dae‐Woon; Chand, Santanu; Kitagawa, Hiroshi; Das, Madhab C.
• Is Part Of: Chemistry. Volume 26:Issue 20(2020)
• Page Start: 4607
• Page End: 4612
• Publication Date: 2020-03-19
• Subjects: conducting materials -- coordination polymers -- hydrogen bonds -- proton conduction -- proton transport; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201905650
• Languages: English
• ISSNs: 0947-6539

Abstract

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. Abstract : Proton conductor : A Silver–bipyridine 1D coordination polymer crystallized with free H3 PO4, H2 PO4 − and H2 O molecules in its lattice form an infinitely extended 2D hydrogen‐bonded network that result in high proton conductivity of 3.3×10 −3 S cm −1 at 80 °C and 95 % relative humidity. 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.