Heteroarylphosphorus ligands in platinum(II) complexes. The structure of trans-[Pt(P{2-(N-methylpyrrolyl)}Pr-i(2))(2)Cl-2]

Displacement of cod from [Pt(cod)Cl-2] by 2 equiv. of heteroarylphosphorus ligand, PR2R' in dichloromethane at ambient temperature afforded - but for one exception trans-[Pt(P {2-(N-methylpyrrolyl)}Pr-i(2))(2)Cl-2] (1) - the expected cis complexes, cis -[Pt(P {2-(N-methylpyrrolyl)}Ph-2)(2)Cl-2] (2), cis-[Pt(P {2-(5-methylthienyl)}R-2)(2)Cl-2] (R = Ph 3,Pr-i 4) and cis-[Pt( P{ 2-(5-bromopyridinyl)}Pr-i(2))(2)Cl-2] (5). The complexes were fully char acterised and structural assignments were based on (1)J(Pt-195-P-31) coupli ng constants from the NMR data. The structure of 1 was determined by X-ray crystallography, which revealed that the two pyrrolyl substituents on the p hosphine ligands were oriented on opposite sides of the P-Pt-P axis. (C) 20 00 Elsevier Science S.A. All rights reserved.