A new class of soluble and stable transition-metal-substituted polyoxoniobate: [Cr2(OH)4Nb10O30]8−

Abstract

Hydrothermal synthesis of [Cr^III₂(OH)₄Nb₁₀O₃₀]⁸⁻ in gram-scale quantities leads to a new polyoxometalate ion composed of two CrNb₆O₁₉ Lindqvist-type units that are fused via shared faces. The two Cr^III atoms are located in the centre of the molecule and are bridged by two μ₄-O atoms. Electronic transitions are calculated using density functional theory and compare well with the measured UV-Vis spectra.