Synthesis,crystal structure and characterization of a 2-D network organic-inorganic hybrid polymer with [α-BW_(12)O_(40) ]^(5) as building blocks  

作　　者：WANG Jingping LI Jie NIU Jingyang 

机构地区：[1]Institute of Molecular and Crystal Engineering, Institute of Chemistry and Chemical Engineering, Henan University, Kaifeng 475001, China Institute of Molecular and Crystal Engineering, Institute of Chemistry and Chemical Engineering, Henan University, Kaifeng 475001, China Institute of Molecular and Crystal Engineering, Institute of Chemistry and Chemical Engineering, Henan University, Kaifeng 475001, China

出　　处：《Science China Chemistry》2006年第5期437-444,共8页中国科学（化学英文版）

基　　金：This work was supported by the National Natural Science Foundation of China (Grant No.20571023); the Doctor Foundation of Education; the Out-standing Youth Foundation of Henan Province; the Natural Science Foundation of Henan Province and Henan Innovation Project for University Prominent Research Talent.

摘　　要：A two-dimensional network compound [Ce(DMF)4(H2O)][α-BW12O40]·H2O·(HDMA)2 (HDMA = protoned dimethylamine, DMF = N,N-dimethylformamide) was synthesized from α-H5BW12O40·nH2O, Ce(NO3)3·6H2O and DMF and characterized by IR, UV spectra and TG-DTA. The result of the X-ray single crystal diffraction indicates that the crystal is monoclinic, space group P21/n, with unit cell dimensional: a = 1.1983(3), b = 2.4216(5), c = 1.9517(4) nm, β = 92.91(3)°, Z = 4, R1 = 0.07710, wR2 = 0.1416. Structural analysis indicates that every [Ce(DMF)4(H2O)]3+ building block is surrounded by three adjacent [α-BW12O40]5- polyanions, meanwhile, every [α-BW12O40]5- polyanion interconnects with three neighboring [Ce(DMF)4(H2O)]3+ subunits, by making use of which two-dimensional network structure can be constructed. The result of thermogravimetric analysis manifests that the title compound has two-stage weight loss and the decomposition temperature of the title polyanionic framework is 560℃ . The electrochemical analysis shows the title polyanion has three-step redox processes in the pH = 4―7 media.A two-dimensional network compound[Ce(DMF)_4(H_2O)][α-BW_(12)O_(40)]·H_2O·(HDMA)_2 (HDMA = protoned dimethylamine, DMF =N,N-dimethylformamide) was synthesized from α-H_5BW_(12)O_(40)·nH_2O, Ce(NO_3)_3·6H_2O and DMFand characterized by IR, UV spectra and TG-DTA. The result of the X-ray single crystal diffractionindicates that the crystal is monoclinic, space group P2_1/n, with unit cell dimensional: a =1.1983(3), b = 2.4216(5), c = 1.9517(4) nm, β = 92.91(3)°, Z = 4, R_1 = 0.07710, wR_2= 0.1416.Structural analysis indicates that every [Ce(DMF)_4(H_2O)]^(3+) building block is surrounded bythree adjacent [α-BW_(12)O_(40)]^(5-) polyanions, meanwhile, every [α-BW_(12)O_(40)]^(5-)polyanion interconnects with three neighboring [Ce(DMF)_4(H_2O)]^(3+) subunits, by making use ofwhich two-dimensional network structure can be constructed. The result of thermogravimetric analysismanifests that the title compound has two-stage weight loss and the decomposition temperature ofthe title polyanionic framework is 560℃. The electrochemical analysis shows the title polyanion hasthree-step redox processes in the pH = 4-7 media.

关 键 词：borotungstic acid  NETWORK structure  polyoxometalates  crytal structure. 

分 类 号：N[自然科学总论]