Spectral Study of Two Bi(Ⅲ) Contained Heteropolymate Compounds
WANG Yong-jing1，2, ZHANG Han-hui1, 2*, HUANG Chang-cang1, CHEN Yi-ping1, SUN Rui-qing1
1. Department of Chemistry, Fuzhou University, Fuzhou 350002, China 2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
Abstract：Two Bi(Ⅲ) contained heteropolymate compounds Co5[Bi2Co2W20O70(H2O)6]·44H2O(Ⅰ)and Na3H2[Ce3(H2O)18Bi2W22O76]·23H2O(Ⅱ) have been synthesized under hydrothermal condition. The relationship between their properties and structures was studied by using FTIR, NIR FT-Raman, and UV-Vis DRS etc. The characteristic vibrational frequencies νas(MOd) and νs(M—Ob—M) is related to the structure of the materials.νas(M—Ob—M) is demonstrated to explain why the the oxidative ability becomes stronger when W atoms are substituted by Co atoms. In UV-Vis DRS spectra of compound Ⅰ and Ⅱ, there are two characteristic peaks at 254, 319 nm and 220, 310 nm coresponding Od→W and to Ob, c→W charge transfer，respectively. The wide and weak absorption band of compound Ⅰat 529 nm can be assigned as Co2+d-d transfer. Finally, quantum chemistry calculation of compound Ⅰ was performed to explain the structure characteristic.
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