Synthesis and Thermochromic Properties of New Five-coordinate Copper Chelates

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  • Noriko Iwasaki
    Department of Chemistry, Faculty of Science, Ochanomizu University
  • Kozo Sone
    Department of Chemistry, Faculty of Science, Ochanomizu University
  • Heijiro Ojima
    Department of Chemistry, Aichi Kyoiku University

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<jats:title>Abstract</jats:title> <jats:p>Two new five-coordinate copper(II) chelates [Cu(PCdien)] and [Cu(PCenpn)] were prepared, and the thermochromism of the former in methanolic solution was studied. When this violet-blue solution (νmax: 16500 cm−1) was heated nearly to the boiling point of methanol, the color of the solution became gradually yellowish (νmax: 21000 cm−1). The absorption spectra of these cold and hot solutions were compared with those of similar four-coordinate Cu(II) complexes in various solvents, and the yellow color was ascribed to a tetracoordinated species of [Cu(PCdien)], which is formed by the partial rupture of the pentacoordinated structure caused by the intramolecular steric strains. No thermochromic property of the PCenpn chelate was observed.</jats:p>

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