The 31P{1H} NMR spectra of [(Mes3P)2M]+BF4- (M = Cu, Ag, Au) show two types of nonequivalent phosphorus nuclei due to the presence of stereoisomers which arise from the existence of propeller isomerism in the trimesitylphosphine ligands.
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Bayler et al. (1996) studied this question.
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