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Thermochromic and Chromotropic Phenomena of Cobalt(II) Chloride Solutions and Related Systems

  • Chapter
Inorganic Thermochromism

Part of the book series: Inorganic Chemistry Concepts ((INORGANIC,volume 10))

Abstract

The pink color of an aqueous solution of cobalt(II) chloride is known to be due to that of the 6-coordinate octahedral hexaaqua cation, [Co(H2O)6]2+. However, anhydrous CoCl2 is blue and its solutions in various organic solvents, such as alcohols or acetone, are also blue. In general, the blue color is ascribed to the formation of tetrahedral 4- coordinate complexes. These are often formed when the Co-L (L: ligand) bond is rather weak and ionic, and the ligand is bulky (hence, interhgand repulsion favors a tetrahedral geometry). For example, the spectral and conductometric studies of a number of investigators (e.g. Katzin, Libuś, Osugi, and their collaborators [14,17,31]) have indicated that the blue neutral species of the composition [Co(Solv)2Cl2] predominates in ethanol and higher alcohols (Solv = a solvent molecule; cf. Chap. B.II).

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Authors and Affiliations

  1. Department of Chemistry Faculty of Science, Ochanomizu University, Otsuka 2-1-1, Bunkyo-ku, Tokyo 112, Japan

    Prof. Dr. Kozo Sone & Prof. Dr. Yutaka Fukuda

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  1. Prof. Dr. Kozo Sone
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  2. Prof. Dr. Yutaka Fukuda
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© 1987 Springer-Verlag Berlin, Heidelberg

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Sone, K., Fukuda, Y. (1987). Thermochromic and Chromotropic Phenomena of Cobalt(II) Chloride Solutions and Related Systems. In: Inorganic Thermochromism. Inorganic Chemistry Concepts, vol 10. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-51017-5_2

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  • DOI: https://doi.org/10.1007/978-3-642-51017-5_2

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-51019-9

  • Online ISBN: 978-3-642-51017-5

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