Open-Framework and Microporous Vanadium Silicates

A series of novel vanadium silicates with open-framework and microporous structures has been
synthesized under mild hydrothermal conditions. Ten distinct framework types have been identified that all
have structures based on cross-linking single silicate sheets with square pyramidal VIVO5 units to give
compounds with the general formula Ar[(VO)s(Si2O5)p(SiO2)q]·tH2O, where A is Na, K, Rb, Cs, or a
combination. The vanadosilicate (VSH-n) structures have free channel diameters up to 6.5 Å and show
good thermal stability, absorption, and ion-exchange properties, suggesting their potential for technological
applications as molecular sieves or in catalysis.