Coordination chemistry of the multi-funtionalized 3-(diphenylphosphino)-1-propylamine ligand with ruthenium(II) (original) (raw)

The reaction of RuCl2(PPh3)3 with two molar equivalents of a multi-functionalized ligand, 3-diphenylphosphino-1propylamine (DPPA) yields two mononuclear, low spin, diamagnetic, octahedral neutral complexes, [RuCl2(η -P,NDPPA)2] (1) and [RuCl2(η -P,N-DPPA)(PPh3)2] (2). The complexes have been characterized by conductivity measurements, FTIR, UV-vis, H and variable temperature P{H} NMR, ESI(+)MS, TGA-DTG and cyclic voltammetry. The ESI(+) mass spectrogram of (1) shows molecular ion peak at m/z 658[M], indicating mononuclear nature of the complex . No fluxional behavior is observed from the variable temperature (200-300 K) P{H} NMR spectra. The complexes (1) and (2) upon treatment with CH3CN in 1:1 molar ratio in the presence of NH4PF6 in dichloromethane solution afford the six-coordinate cationic complexes [RuCl(η-P,N-DPPA)2(CH3CN)](PF6) (3) and [RuCl(η -P,N-DPPA)(CH3CN)(PPh3)2](PF6) (4), respectively. The complexes (3) and (4) have also been characterized by FTIR, ESI(+)MS, H and P{H...