In situ observations of the phase transition among cobalt(II) dichloride hydrates and crystal structures of the tetra- and hexahydrates.
作者： Kenji Waizumi , Hideki Masuda , Hitoshi Ohtaki , Katsuo Tsukamoto , Ichiro Sunagawa
DOI: 10.1246/BCSJ.63.3426
关键词:
摘要: Transformation among cobalt(II) dichloride hydrates in aqueous solutions was studied by the optical microscopic method. Although there are three (CoCl2·6H2O, CoCl2·4H2O, and CoCl2·2H2O) phase equilibrium diagram, only solution mediated transformation between CoCl2·6H2O CoCl2·2H2O could be observed under present experimental conditions it confirmed that CoCl2·4H2O hardly formed compared with other two hydrates. In order to investigate reason why crystallized at from through vice versa, crystal structure of investigated X-ray diffraction The reexamined because previously reported results had a relatively large R-factor. is monoclinic, space group P21/a a=11.548(1) A, b=9.342(1) c=6.056(1) β=110.79(1)°, Z=4. complex has slightly distorted octahedral geometry about Co2+ ion Cl− ions ar...
csj.jp参考文章(20)
Hyo-Gwang Lee, Yukiei Matsumoto, Toshio Yamaguchi, Hitoshi Ohtaki, X-Ray Diffraction Studies on the Structures of Hydrated Oxonium Ion, and the Chlorocobalt(II) and Tetrachlorocobaltate(II) Complexes in Aqueous Solutions Bulletin of the Chemical Society of Japan. ,vol. 56, pp. 443- 448 ,(1983) , 10.1246/BCSJ.56.443
Werner H. Baur, Hydrogen Bonding in Manganese Dichloride Tetrahydrate Inorganic Chemistry. ,vol. 4, pp. 1840- 1841 ,(1965) , 10.1021/IC50034A050
R. D. Shannon, C. T. Prewitt, Revised values of effective ionic radii Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. ,vol. 26, pp. 1046- 1048 ,(1970) , 10.1107/S0567740870003576
Mauro Magini, Hydration and complex formation study on concentrated MCl2 solutions [M=Co(II), Ni(II), Cu(II)] by x‐ray diffraction technique Journal of Chemical Physics. ,vol. 74, pp. 2523- 2529 ,(1981) , 10.1063/1.441322
A. Musinu, G. Paschina, G. Piccaluga, M. Magini, X‐ray diffraction study of CoCl2–LiCl aqueous solutions The Journal of Chemical Physics. ,vol. 80, pp. 2772- 2776 ,(1984) , 10.1063/1.447024
G. Paschina, G. Piccaluga, G. Pinna, M. Magini, X-ray investigation of CoCl bonding in a concentrated aqueous solution of CoCl2 and LiCl Chemical Physics Letters. ,vol. 98, pp. 157- 161 ,(1983) , 10.1016/0009-2614(83)87119-X
Allan Zalkin, J. D. Forrester, David H. Templeton, The Crystal Structure of Manganese Dichloride Tetrahydrate Inorganic Chemistry. ,vol. 3, pp. 529- 533 ,(1964) , 10.1021/IC50014A017
D. L. Wertz, R. F. Kruh, X‐Ray Diffraction Study of Some Concentrated Cobalt(II) Chloride Solutions The Journal of Chemical Physics. ,vol. 50, pp. 4313- 4317 ,(1969) , 10.1063/1.1670896
R. D. Shannon, C. T. Prewitt, Effective ionic radii in oxides and fluorides Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. ,vol. 25, pp. 925- 946 ,(1969) , 10.1107/S0567740869003220
B. Morosin, E. J. Graber, A reinvestigation of the crystal structure of CoCl2.2H2O Acta Crystallographica. ,vol. 16, pp. 1176- 1178 ,(1963) , 10.1107/S0365110X63003066