Syntheses, structures and properties of two new 3-D vanadoborates based on V[sbnd]O[sbnd]B clusters

Abstract

Two new 3-D vanadoborates {[Cd(H2O)2]3V12B18O54(OH)6}·4H3O·26H2O (1) and [K6(H2O)10Zn4V10B32O74(OH)10]·5H2O (2) have been hydrothermally synthesized and structurally characterized. The 3-D vanadoborate framework of 1 is constructed by [V12B18O54(OH)6]10− clusters bridged by [CdO6] octahedra, which displays new type of 3-D open-framework vanadoborate. 2 contains [Zn4V10B32O74(OH)10]6− clusters and 2-D [K6O35]n layers, which are interconnected to form a 3-D [K6(H2O)10Zn4V10B32O74(OH)10] architecture with 1-D tunnels filled with free H2O molecules. Although a few 3-D vanadoborate frameworks have been reported, their building units are all ternary vanadoborate BOV clusters. Therefore, 2 is the first example of 3-D vanadoborate framework based on quaternary vanadoborate [Zn4V10B32O74(OH)10]6− cluster. 1 and 2 display selectively photocatalytic degradation of methylene blue (MB) under UV light irradiation. The magnetic susceptibilities show the antiferromagnetic interaction between V4+ cations in 1 and 2.