The Research Of Sandwich-type Polytungsto-bismutates(-Germanates) Decorted By Transition Metals/Estertin

In this paper, five polyoxometalates with sandwich-type based on trivacant Kegginstructure（{BiW₉},{GeW₉}） have been obtained in aqueous solution by routine syntheticmethod. The transition metal ions of Co（II），Mn（II） and estertin groups have been introducedinto the skeletons of these polyoxoanions. All compounds have been characterized bysingle-crystal X-ray diffraction, elemental analysis, IR spectroscopy, TG analysis andelectrochemical analysis. Their electrocatalytic properties toward the reduction of hydrogenperoxide have been investigated by cyclic voltammetry （CV）.1. The sandwich-type polytungstobismuthate functionalized with etertin units has beendesigned and synthesized:Na6K₄[{Sn（C₃H₄O₂）}2{Sn（C₃H₄O₂）（H₂O）}2(B-β-BiW₉O₃₃)2]·21H₂O （1）2. Two sandwich-type polytungstobismuthates functionalized with etertin and transitionmetals units have been designed and synthesized:Na₈K₂[{Co（H₂O）3}2{Sn（C₃H₄O₂）}2(B-β-BiW₉O₃₃)₂]·25H₂O （2）K₁₀[{Mn（H₂O）3}2{Sn（C₃H₄O₂）}2(B-β-BiW₉O₃₃)₂]·30H₂O （3）3. Two sandwich-type germanotungstates: based on {GeW₉} polyanion have beendesigned and synthesized by introducing two different estertin groups:[C（NH₂）3]10H₂[Mn2{Sn（C₃H₄O₂）}2（B-α-GeW₉O34）2]·8H₂O （4）Na₃K₉[Mn₂{Sn（C₄H₆O₂）}2(B-α-GeW₉O₃₄)2]·17H₂O （5）...