Synthesis of cis- and trans-dichloro(dimethylphenylphosphine)-(1-methyl-1,4,5,6-tetrahydropyrimidine) platinum(II) and their spectral and structural characterization

Abstract

Interaction of [{Pt(μ-Cl)Cl(PMe2Ph)}2] with 1-methyl-1,4,5,6-tetrahydropyrimidine, L (R=Me), in boiling toluene produced a mixture of cis- and trans- isomers of [PtCl2(PMe2Ph){N=CH(Me)CH2CH2CH 2}]; trans-complex 2 isomerizes to give thermodynamically more stable corresponding cis-complex 1 in boiling ethanol. Spectroscopic and X-ray diffraction data permit generalizations about cis- and trans- isomeric pairs to be made. In addition, the trans influence of the ligand L is reliably assessed.