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Monoacetonitrile complexes of the formula CH3CNPtCl2Un have been prepared where Un is ethylene or carbon monoxide. The infrared spectra of these complexes showed them to have the cis-configuration with the nitrile bonded through the lone pair electrons on nitrogen. The coordinated nitrile fails to exchange with solvent nitrile even on long standing but the ethylene can be readily exchanged.
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Weil et al. (1971) studied this question.
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