Water mediated proton conductance in a hydrogen-bonded Ni(II)-bipyridine-glycoluril chloride self-assembled framework

作者：Tayade Sakharam B; Bhat Satish S; Illathvalappil Rajith; Dhavale Vishal M; Kawade Vitthal A; Kumbhar Avinash S^*; Kurungot Sreekumar; Naether Christian

来源：CrystEngComm, 2018, 20(8): 1094-1100.

DOI：10.1039/c7ce01814b

Proton conducting properties have been investigated in a new Ni(II)-based hydrogen-bonded porous framework synthesized using a urea-fused bipyridine-glycoluril (BPG) tecton. This hydrogen-bonded self-assembled structure encapsulates water molecules in the channels with hydrogen-bonding networks which exhibits a significant temperature dependent proton conductance of 1.5 x 10(-4) S cm(-1) at 95 degrees C and 95% RH with a low activation energy (E-a) of 0.54 eV, implying a Grotthuss proton hopping mechanism mediated by hydrogen-bonded water molecules in the channels. In addition, this framework exhibited a very high water uptake under humid conditions. A continuous array of water molecules and chloride ions embedded in the highly hydrophilic porous channels of the hydrogen-bonded framework acts as the proton conducting medium.

• 出版日期2018-2-28