Synthesis and characterization of a dimeric polyoxometalate based on the [γ-SiW_(10)O_(36)] unit

A new dimeric polyoxometalate K8[{γ-SiW10O32}2(μ2-O)4]·13H2O(Ⅰ)has been obtained by the standard synthetic reaction,and characterized by IR,TG,element analysis and single-crystal X-ray diffraction analysis.Single-crystal X-ray diffraction analysis reveals that compound Ⅰ was composed of two [γ-SiW10O36] units linked by four W—O—W bridges.The crystal data are following:monocilnic,space group:P2(1)/n,a=1.524 4(3) nm,b=1.320 3(3) nm,c=1.904 4(4) nm,β=105.45(3)°,V=3.694 2(13) nm3,Z=2,R1=0.070 6,wR2=0.162 1.