α-B-Keggin型杂多化合物K_5H[Co_4(VW_9O_(33))_2]·5H_2O的合成和结构

Synthesis and Structure of α - B - Keggin Type Heteropoly Complex K_5H[Co_4(VW_9O_33)_2]@5H_2O

合成了新化合物K_5H[Co_4(VW_9O_(33))·5H_2O,并运用IR,UV-ViS,DTA和单晶X射线衍射对其结构进行了表征.测定结果证实标题化合物具有α-B-Keggin型结构,两个(VW_9O_(33)^(7-)结构单元由四个Co(Ⅱ)O_6 八面体连接.杂多化合物属单斜晶系P2_(1/n),a=1.2307(3)nm,b=2.1250(4)nm,c=1.5817(3)nm,β=91.86(3)°,V=4.1343(14)nm^3,R=0.0895,R_w=0.2180.

A new complex K5H[ Co4 (VW9O33)2]·5H2 O was prepared and its structure was determined by X - ray diffraction analysis. The anion has α - B - Keggin structure. Two (VW9O33)7- moieties (α -B isomers) are linked via four Co(11)O6 groups. The single crystal of the title complex is monoclinic P21/n with a = 1.2307(3)nm, b = 2.1250(4)nm, c = 1.5817(3)nm, β = 91.86(3)°, V = 4.1343 (14)nm3, R = 0.0895, Rw = 0.2180.