Assembly of Si-Substituted Heteropolyoxotantalate Architectures

Abstract

The first heteropolyoxotantalate (heter-POTa) containing Si element, Li7KNa11H6[Si2Ta24(O2)20O52(OH)9]·85H2O (1), has been obtained by self-assembly in neutral solution. The polyanion consists of 5 tetrahedral {[Ta(O2)O5]4}, 4 {TaO6} atoms and 1 {Si2O7} unit. The compound is the largest hetero-POTas at present. Additionally, 1 has decent proton conduction performance with proton conductivity of 3.63 × 10−3 S cm−1.