Synthesis, characterization and crystal structure of a new dimeric tetra-Ni-substituted sandwich tungstogermanate

A new tungstogermanate NaK5Ni3(H2O)18[Ni4(H2O)2 (GeW9O34)2] ·13.5H2O (1) has been obtained in aqueous solution and characterized by IR, UV, element analysis, TG, electrochemistry and X-ray single crystal diffraction analysis. Polyoxoanion 1 was composed of two [GeW9O34]10− units linked by a Ni4 cluster, which was first observed, and the anions were connected by K+ ions to constitute a novel one-dimensional chainlike complex.