Synthesis and characterization of trisubstituted heteropolytungstogermanates containing group 3A elements

Abstract

Abstract Six new compounds, α,β‐K a H b ,[GeW 9 M 3 (H 2 O) 3 O 37 ] x H 2 O(M = Al, Ga, In; a + 6 =7) and α‐K 9 H 5 [Ge 2 W 18 Ga 6 (H 2 O) 3 O 74 ]·20H 2 O, were synthesized from the lacunary precursors a and β‐GeW 9 O 10− 34 and characterized by elemental analysis, spectroscopy and electrochemistry. Tungsten‐183 NMR spectra of the title complexes consist of two lines with intensity ratio 2:1 as expected for trisubstituted heteropoly anions. The intensity ratio of α‐Ga compound is 1:2, which is different from others(2:1). With the help of FAB mass spectrum, we concluded that it is a dimer with D 3h structure in aqueous, and the others exist by monomers with C 30 structures.