Structural parameters for the incomplete cuboidal cluster cation: [Nb3(µ3-Cl)(µ-O)3(OH2)9]4+ in solutions of acid hydrolysed trivalent niobium from Nb K edge EXAFS

A niobium K edge EXAFS study on the green solutions obtained following hydrolysis of NbCl3(dme) in aqueous non-oxidising strong acids has shown that the major species resulting in these solutions is the incomplete cuboidal chloride-capped triangular niobium cation, [Nb3(µ3-Cl)(µ-O)3(OH2)9]4+.