A route to a Keggin-Type α-[(XIIIO4)Mo12O35(OH)]4− anion through an Anderson-type [XIII(OH)6Mo6O18]3− anion: X = Ga†
Abstract
From an aqueous MoVI–GaIII–HCl system, a colourless complex was isolated as a K+ salt, which consists of a hexaprotonated Anderson-type [Ga(OH)6Mo6O18]3− anion. A yellow complex became kinetically stable by the presence of CH3CN at concentrations of 30–40% (v/v). The X-ray structural analysis revealed that the yellow (NPrn4)4[(GaO4)Mo12O35(OH)] crystal contains an α-Keggin structure and the oxygen atom at an edge-shared contact is protonated. The formation conditions of the Keggin complex were elucidated in relation to those of the Anderson complex by a combined 71Ga