Synthesis, Structure And Characterization Of New Large Polyoxometalate Cluster Compound Based On Tungstophosphate Building Blocks

The aim of this thesis is the synthesis of new large polyoxometalate cluster compound on the basis of Tungstophosphate polyoxoanion clusters. The study on synthetic conditions and rules for these new compounds is carried out and the factors influencing the structures of these compounds have also been studied.One new large polyoxometalate cluster compound has been synthesized on the basis of room temprature synthesis methods and structurally characterized by elemental analyses, IR, TG and single crystal X-ray diffractions.1. A novel crown-shaped heteropolytungstate is formed by covalently linking two [PW₁₁O₃₉]7- and two [PW9O34]9- fragments with four WO6 octahedra: K₇Na₁₃[(PW₁₁O₃₉)2(PW₉O₃₄)₂(W₂O₃)₂]·25H₂O (1)which represents not only the largest tungstophosphate constructed from two types of building blocks without considering the 4f lanthanide or other 3d transition metal ion linkers,but also the highest degree of aggregation known in the large clusters incorporating monovacant lacunary anions.