A new type of germanium–vanadate cluster, [Ge5V6O21(heda)6] (Hheda = N-(2-hydroxyethyl)ethylenediamine)

Abstract

A germanium–vanadate cluster [Ge₅V₆O₂₁(heda)₆] (1) with covalently coordinated N-(2-hydroxyethyl)ethylenediamine (Hheda) was synthesized and crystallographically characterized. The cluster is a new type of GeVO cluster, in which there coexists various oxo-polyhedra of V^IV and Ge^IV, octahedral VO₆, VO₅N, and GeO₄N₂, VO₅ pyramid and GeO₄ tetrahedron. The cluster is also an unusual neutral germanium–polyoxovanadate. The deprotonated hydroxyl group and part of the amine groups of the heda ligand covalently coordinate to the cluster. There are three coordination modes of the ligand, monodentate, chelating and multi-chelating modes. The organic ligand plays important roles in the charge balance and cluster construction.