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Thermochromic and solvochromic behaviour of cobalt (II) chloride solutions in various solvents

1966; Royal Netherlands Chemical Society; Volume: 85; Issue: 4 Linguagem: Inglês

10.1002/recl.19660850411

1878-7096

W. C. Nieuwpoort, G. A. Wesselink, E. H. A. M. van der Wee,

Spectroscopy and Quantum Chemical Studies

Abstract In this paper the spectral behaviour at different temperatures of solutions of anhydrous CoCl 2 in water, methanol, ethanol, 1‐propanol, 2‐propanol, and acetone is reported and discussed. The work was initiated by the striking colour changes observed in some of these solvents when the temperature is lowered well below room temperature. The effects are interpreted in terms of octahedral‐tetrahedral configurational changes of solvated Co 2+ complexes. A number of earlier observations, which are relevant to the ones reported here and most of which support the interpretation given, are briefly reviewed and discussed.