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Title: Coordination chemistry of the multi-funtionalized 3-(diphenylphosphino)-1-propylamine ligand with ruthenium(II)
Authors: Borah, Geetika
Boruah, Devajani
Keywords: Coordination Chemistry;Multi-functional Ligands;Ruthenium;Aminophophines
Issue Date: Mar-2012
Publisher: NISCAIR-CSIR, India
Abstract: The reaction of RuCl2(PPh3)3 with two molar equivalents of a multi-functionalized ligand, 3-diphenylphosphino-1-propylamine (DPPA) yields two mononuclear, low spin, diamagnetic, octahedral neutral complexes, [RuCl22-P,N-DPPA)2] (1) and [RuCl22-P,N-DPPA)(PPh3)2] (2). The complexes have been characterized by conductivity measurements, FTIR, UV-vis, 1H and variable temperature 31P{1H} 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) 31P{1H} 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(η2-P,N-DPPA)2(CH3CN)](PF6) (3) and [RuCl(η2-P,N-DPPA)(CH3CN)(PPh3)2](PF6) (4), respectively. The complexes (3) and (4) have also been characterized by FTIR, ESI(+)MS, 1H and 31P{1H} NMR spectra at room temperature. The complexes (1) and (2) are found to have high catalytic activity towards the oxidation of aromatic alcohols with H2O2/NaOCl as oxidant. Maximum conversion of 95% can be achieved under mild reaction conditions.
Page(s): 444-452
Appears in Collections:IJC-A Vol.51A(03) [March 2012]

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