Abstract
The new complex [Rh(dps) 2Cl 2]PF 6 ( 1) (dps = di-2-pyridyl sulfide) was prepared by reacting RhCl 3 with dps in an ethanol-water mixture (2:1). As shown by 1H NMR spectroscopy 1 exhibits cis geometry. By refluxing 1 with bipy or phen bipy = 2,2′-bipyridine, phen = 1,10-phenanthroline) in dimethylformamide the complexes [Rh(bipy) 2Cl 2]PF 6 and [Rh(phen) 2Cl 2]PF 6 were respectively obtained. On the contrary the reaction of 1 with bpp bpp = 2,3-bis(2-pyridyl)pyrazine), carried out in the same experimental conditions, gave [Rh(bpp) 3][PF 6] 3 ( 2) in high yields. The meridional ( mr) and facial ( fac) isomers of 2 were separated by chromatography. Despite the complexity of the 1H and 13C NMR spectra of the mer isomer, almost complete assignment of the resonances was possible by employment of the two-dimensional techniques by comparison with the resonances of the fac isomer.
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