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Synthesis and spectroscopic investigation of cis and trans isomers of bis(nitrile)dichloroplatinum(II) complexes

1992; Elsevier BV; Volume: 201; Issue: 1 Linguagem: Inglês

10.1016/s0020-1693(00)84996-8

1873-3255

Daniela Fraccarollo, Roberta Bertani, Mirto Mozzon, U. Belluco, Rino A. Michelin,

Organometallic Complex Synthesis and Catalysis

A series of bis(nitrile) complexes cis- and trans-Cl2Pt(NCR)2(R=C6H5,p-CH3C6H4, p-CF3C6H4, o-CH3C6H4,CH3, CH3CH2, CH3CH2CH2, (CH3)2CH, (CH3)3C) has been prepared by either one of the two methods, K2PtCl4/H2O/ RCN(excess) or PtCl2/RCN(neat), both of which usually yield the nitrile complexes as a mixture of cis and trans isomers in different ratios depending on the experimental conditions such as the reaction temperature and the reaction time. The separation of the stereoisomers of each bis(nitrile) compound could be achieved by fractional crystallization by taking advantage of the generally higher solubility of the trans species in non-polar solvents. The complexes were characterized by IR, 1H and 13C NMR spectroscopies. Some general trends of v(CN) and v(PtCl) stretching frequencies as well as of the 2J(PtC) values have been found to be useful in determining the stereogeometry of the cis and trans isomers of the Cl2Pt(NCR)2 complexes.