Palladium(II) thiocyanate organophosphorus complexes

Article abstract of DOI:10.1021/ic50206a049

A series of seven complexes of the type L₂Pd(CNS)₂ [L = R_nP(C₆H₅)_3-n, n = 0-3, R = methyl and benzyl] have been prepared and investigated for geometrical and linkage isomerism. The complexes have been characterized from physical properties, infrared spectroscopy, and ¹H, ¹³C{¹H}, and ³¹P{¹H} NMR spectroscopy. Most of the complexes are exclusively trans in CDCl₃ solution, the exceptions being L = (C₆H₅)₃P and (C₆H₅)₂PCH₃ which exhibit both cis and trans isomers. Infrared integrated intensity ratio studies in chloroform indicate the predominance of N-bonded isomers in every case, while NMR shows the presence of other possible linkage isomers for various complexes. An NMR shift reagent, Eu(fod)₃, was used to facilitate identification of the different linkage isomers in solution. The interrelation of geometrical and linkage isomerism for this series of complexes, as well as the factors influencing such, is discussed.