The restricted rotation about carbon-nitrogen bonds of unsymmetrical palladium(II) dithiocarbamate chelates has been investigated by high-performance liquid chromatography. At higher temperatures, the rotation is so rapid that two rotamers have not been distinguished, and a single sharp peak has appeared on chromatograms, whereas at lower temperatures, they have been separated. The activation energy of the rotation of palladium(II) dithiocarbamate (ΔH=83±5 kJ mol−1 for Pd(C6H5CH2CH2NHCSS)2) is smaller than usual values of the energy barrier to rotate double bonds, but larger than those to rotate single bonds.
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Moriyasu et al. (1983) studied this question.
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