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 VIV and GeIV, 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.