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(C_3H_5N_2)_2Na_8[{Co(H_2O)}_2WO(H_2O)(AsW_9O_(33))_2]·33H_2O的合成及晶体结构

Synthesis and Crystal Structure of Heteropolytungstate(C_3H_5N_2)_2Na_8[{Co(H_2O)}_2WO(H_2O)(AsW_9O_(33))_2]·33H_2O
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摘要 在pH=5.5和80℃下,Na_2WO_4.2H_2O,NaAsO_2.6H_2O,Co(NO_3)_2.6H_2O和咪唑的水溶液反应,得到了高产率的夹层型杂多酸盐(C_3H_5N_2)_2Na_8[{Co(H_2O)}_2WO(H_2O)(AsW_9O_(33))_2].33H_2O单晶,用X射线单晶衍射法及元素分析确定了其结构.结果表明:该晶体属四方晶系,空间群P-421m,a=1.7191(10),c=1.6376(13)nm,V=4.840(5)nm3,Z=2,R1=0.0484,wR2=0.0714(I>2σ),杂多阴离子[{Co(H_2O)}_2WO(H_2O)(AsW_9O_(33))2]10-具有C2ν对称性,Co2+的配位数均为5.讨论了(CHN)Na[{Co(HO)}WO(HO)(AsWO)].33HO的形成条件. The novel sandwich heteropolytungstate(C_3H_5N_2)_2Na_8[{Co(H_2O)}_2WO(H_2O)(AsW_9O_33)_2]·33H_2O is obtained by the reaction of Na_2WO_4·2H_2O with NaAsO_2·6H_2O,Co(NO_3)_2·6H_2O and imidazole in pH≈5.5 and at 80 ℃.Its structure is determined by X-ray diffraction analysis and element analysis.This is a salt,which crystallizes in the tetragonal space group P-421m with a=1.719 1(10) c=1.637 6(13) nm,V=4.840(5) nm3,Z=2,R1=0.048 4,wR2=0.071 4(I>2σ).The structure of [{Co(H_2O)}_2WO(H_2O)(AsW_9O33)_2]10-reveals a sandwose-like arrangement of two {α-B-AsW_9} moieties enclosing two Co(H_2O)2+ which coordinated number is five.
作者 刘雪梅 付峰 徐海升 薛岗林
机构地区 西安石油大学应用化学重点实验室 延安大学化学化工学院陕西省化学反应工程重点实验室 西北大学化学系陕西省物理无机化学重点实验室
出处 《西安石油大学学报（自然科学版）》 CAS 2007年第6期85-88,共4页 Journal of Xi’an Shiyou University（Natural Science Edition）
基金 陕西省教育厅专项基金项目(编号:03JK077 03JS006)
关键词 杂多钨酸盐 晶体结构 钴 砷 钨 咪唑 heteropolytungstate crystallographic structure cobalt arsenic tungsten imidazole
分类号 O642.3 [理学—物理化学]
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参考文献11

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共引文献5

西安石油大学学报（自然科学版）
2007年 第6期

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