The chemical shifts and coupling constants of protons in a series of dichloro(4-substituted-pyridine l-oxide)ethyleneplatinum(II) complexes (I) were determined. The coupling constant between platinum and the protons of ethylene as well as the chemical shift of the protons is influenced by the nature of the substituent on the trans N-oxide. As the electron-withdrawing character of the substituent increases, the chemical shift, as expected, moves downfield; however, the coupling constant increases. The chemical shifts of the protons ortho to the substituent on the N-oxide move upfield as the electrondonating power of the substituent is increased while the meta protons are influenced in the same way but to a much lesser extent.
Ligand lability in some nwz.s-l,3-dichloro-2-olefin-4-(4-Z-pyridine)platinum(II) complexes (1) was examined by means of nmr spectroscopy. Solvent-initiated exchange with the pyridine moiety occurs more readily than with the olefin moiety. The ease of exchange of the pyridines depends upon the solvent, the temperature, the nature of Z, and the structure of the olefin. Ethylene is a better iranj-labilizing olefin than either cisor zra/M-2-butene. When two different complexes, la and lb, are mixed in deuteriochloroform, ligand exchange occurs and the four possible complexes are obtained.
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