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Updated: Jan 16, 2026
Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
Building Blocks Selected via a Rational Design Strategy for Developing POM-Based MOFs with Enhanced Proton
Bao-Yue Zhang1, Ning-Hao Wang1, Xue-Song Wu1
1School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, Jilin Provincial International Joint Research Center of Photo-functional Materials and Chemistry, Changchun 130022, China.
Abstract:
Designing and synthesizing polyoxometalate-based metal-organic frameworks (POMOFs) with high proton conductivity is highly significant yet challenging. An effective strategy for developing highly proton-conductive POMOFs involves using polyoxometalates (POMs) with specific acid dissociation constants (pKa), which reflect the ability of an acid to donate protons and serve as a key parameter for proton conduction. Herein, two Anderson-type POMs, (NH4)3[AlMo6O24H6]·7H2O (AlMo6) and (NH4)3[CrMo6O24H6]·7H2O (CrMo6), whose pKa values were determined via DFT calculation. The reliability of these calculated pKa values was confirmed by a strong correlation with experimentally measured proton conductivities under humidified conditions. Using these POMs, along with metal-organic frameworks under hydrothermal conditions, we synthesized two isostructural POMOFs, denoted as CUST-835 (AlMo6) and CUST-836 (CrMo6). Alternating current (AC) impedance studies reveal that CUST-835 achieves a proton conductivity of 2.06 × 10-4 S cm-1 at 90 °C and 98% RH, an order of magnitude higher than that of CUST-836 (1.11 × 10-5 S cm-1).
