Chelate-Ring Formation in Cr(CO)5(phen) Studied by Laser Flash Photolysis with Visible and Infrared Detection

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  • Shigero Oishi
    Department of Chemistry, School of Science, Kitasato UniversityKitasato, Sagamihara, Kanagawa
  • Hiroshi Inui
    Department of Chemistry, School of Science, Kitasato UniversityKitasato, Sagamihara, Kanagawa
  • Yasunao Kuriyama
    Department of Chemistry, School of Science, Kitasato UniversityKitasato, Sagamihara, Kanagawa

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<jats:title>Abstract</jats:title> <jats:p>Kinetic parameters were obtained for the formation of chelate ring in transient Cr(CO)5(phen) and 0.17 s−1 (20 °C), ΔH‡ = 85.0 kJ·mol−1, and ΔS‡ =29.8 J·mol−1·K−1, indicating the concerted extrusion of CO by an uncoordinated nitrogen rather than the simple dissociation of CO. In comparison with other bidentate ligands, it was revealed that the structural advantage of phen, which gave significant enhancement in the rate of chelation, was due to entropy term.</jats:p>

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  • Chemistry Letters

    Chemistry Letters 26 (2), 115-116, 1997-02-01

    Oxford University Press (OUP)

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