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Published on: October 12, 2019
Proton Conduction Study in 2D Layered Polyoxovanadoborate Frameworks Based on Two Types of Open-Type {V12B32}
Ming-Ze Meng1, Bi-Ling Huang1, Shan-Shan Xu1
1College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
None:
Two organic-inorganic hybrid polyoxovanadoborates frameworks were constructed using transition metal complexes (Cd(en)22+, Cu(en)22+; en = ethylenediamine) as templating agents and open-type {V12B32} clusters as building blocks, forming 2D layered architectures. The O-H···O hydrogen bonds between the clusters link the layers to form a 3D supramolecular structure. Single-crystal analysis and two-dimensional correlation infrared spectroscopy (2D-COS-IR) revealed that the two isostructural compounds exhibit distinct hydrogen-bonding patterns, channel dimensions, and porosity due to differences in the coordinated transition metal ions, ultimately leading to variations in solvent molecule content. The compounds exhibit proton conduction properties with a conductivity of 9.52 × 10-4 S·cm-1 for 1 and 1.93 × 10-2 S cm-1 for 2 at 85 °C and 98% RH. The enhanced proton conduction in 2 directly correlates with its larger channel dimensions, which facilitate more efficient proton transport pathways.
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