NMR exchange studies on the complexes trans-[PtX2(C2H4)(Him)] (X = Cl,Br; Him = imidazole) |
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| Affiliation: | 1. Department of Chemistry, University of North Carolina at Chapel Hill (UNC-CH), Chapel Hill, NC, 27599-3290, United States;2. Department of Biochemistry and Biophysics, UNC-CH, Chapel Hill, NC, 27599-3290, United States;3. Lineberger Cancer Center, UNC-CH, Chapel Hill, NC, 27599-3290, United States;4. Integrative Program for Biological and Genome Sciences, UNC-CH, Chapel Hill, NC, 27599-7100, United States;1. Graduate School of Environmental Engineering for Symbiosis, Soka University, 1-236 Tangi, Hachioji, Tokyo 192-8577, Japan;2. Faculty of Science and Engineering, Soka University, 1-236 Tangi, Hachioji, Tokyo 192-8577, Japan;3. Department of Applied Chemistry, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan;1. Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea, Universidad de Zaragoza – CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain;2. ARAID Foundation Researcher, Zaragoza, Spain;3. Center for Refining and Petrochemicals, Department of Chemistry, King Fahd University of Petroleum and Minerals, 31261 Dhahran, Saudi Arabia |
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| Abstract: | The 1H-NMR spectra of the complexes trans-[PtX2(C2H4)(Him)] (X = Cl or Br, Him = imidazole) are discussed. Variable temperature spectra are used to monitor the exchange processes which occur in acetone-d6 solution. It is found, contrary to previous work, that intermolecular exchange occurs for both the chloro- and bromo- complexes. In addition, it is also found that changing the solvent has a marked effect on the rate of exchange. Using an iterative simulation program and assuming intermolecular exchange, the rate constants for the exchange process are determined by band shape analysis, and the enthalpy and entropy of activation are calculated. |
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