STRUCTURE OF COBALT(II) ION AND TRICHLOROCOBALTATE(II) AND TETRACHLOROCOBALTATE(II) COMPLEXES IN N,N-DIMETHYLFORMAMIDE DETERMINED BY THE FLUORESCENT EXAFS METHOD

被引:21
作者
OZUTSUMI, K
TOHJI, K
UDAGAWA, Y
ISHIGURO, S
机构
[1] INST MOLEC SCI, DEPT MOLEC STRUCT, OKAZAKI, AICHI 444, JAPAN
[2] TOKYO INST TECHNOL, DEPT ELECTR CHEM, MIDORI KU, YOKOHAMA, KANAGAWA 227, JAPAN
关键词
D O I
10.1246/bcsj.64.1528
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
EXAFS (extended X-ray absorption fine structure) spectra were measured for N,N-dimethylformamide (DMF) solutions containing cobalt(II) ion and its chloro complexes of low concentration (20-40 mmol dm-3) by a laboratory EXAFS spectrometer modified for the fluorescence detection. The analysis of the EXAFS data for a cobalt(II) perchlorate DMF solution showed that cobalt(II) ion in DMF has an octahedral structure with six DMF molecules. The Co-O (DMF) bond length within [Co(dmf)6]2+ in DMF is 206(1) pm and is practically the same as that within [Co(H2O)6]2+ (208 pm) in water within experimental uncertainties. It was also shown that the tri- and tetrachlorocobaltate(II) complexes in DMF have a tetrahedral structure. The Co-O and Co-Cl lengths within [CoCl3(dmf)]- in DMF are 202(1) and 227(1) pm, respectively. The Co-Cl distances within [CoCl4]2- in DMF and in water are the same and 229(1) pm.
引用
收藏
页码:1528 / 1532
页数:5
相关论文
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