Solvation and complexation of copper (II) and chloride ions in 2,2,2-trifluoroethanol-dimethyl sulphoxide mixtures

Honoh Suzuki, Shin Ichi Ishiguro*, Hitoshi Ohtaki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The formation of copper(II) chloro-complexes has been studied by calorimetry and spectrophotometry in various 2,2,2-trifluoroethanol (TFE)-dimethyl sulphoxide (DMSO) mixtures at 25 °C. It was shown that as the mole fraction of TFE, x, in the mixtures increased, the formation constant of [CuCl]+ gradually decreased to x = 0.8. The result is contrary to that obtained for acetonitrile (AN)-DMSO mixtures. This is ascribed to the decreased entropy of formation of [CuCl]+ in TFE-DMSO mixtures in contrast to the increased entropy in AN-DMSO mixtures with decreasing DMSO content. The corresponding enthalpy of formation of [CuCl]+ remains practically unchanged over the wide range of solvent composition in TFE-DMSO mixtures, as well as in AN-DMSO mixtures. The different variation trend in the entropy of formation of [CuCl]+ in TFE-DMSO and AN-DMSO mixtures may be explained in terms of the different intermolecular interactions between solvent molecules in the bulk.

Original languageEnglish
Pages (from-to)2587-2596
Number of pages10
JournalJournal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
Volume85
Issue number8
DOIs
StatePublished - 1989

ASJC Scopus subject areas

  • General Chemistry

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