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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
Issue Date: Mar-2012
Publisher: NISCAIR-CSIR, India
Abstract: The reaction of RuCl<sub>2</sub>(PPh<sub>3</sub>)<sub>3</sub> with two molar equivalents of a multi-functionalized ligand, 3-diphenylphosphino-1-propylamine (DPPA) yields two mononuclear, low spin, diamagnetic, octahedral neutral complexes, [RuCl<sub>2</sub>(η<sup>2</sup>-P,N-DPPA)<sub>2</sub>] (<b style="">1</b>) and [RuCl<sub>2</sub>(η<sup>2</sup>-P,N-DPPA)(PPh<sub>3</sub>)<sub>2</sub>] (<b style="">2</b>). The complexes have been characterized by conductivity measurements, FTIR, UV-vis, <sup>1</sup>H and variable temperature <sup>31</sup>P{<sup>1</sup>H} NMR, ESI(+)MS, TGA-DTG and cyclic voltammetry. The ESI(+) mass spectrogram of (<b style="">1)</b> shows molecular ion peak at <i style="">m/z</i> 658[M]<sup>+</sup>, indicating mononuclear nature of the complex . No fluxional behavior is observed from the variable temperature (200-300 K) <sup>31</sup>P{<sup>1</sup>H} NMR spectra. The complexes (<b style="">1) </b>and (<b style="">2) </b>upon treatment with CH<sub>3</sub>CN in 1:1 molar ratio in the presence of NH<sub>4</sub>PF<sub>6</sub> in dichloromethane solution afford the six-coordinate cationic complexes [RuCl(η<sup>2</sup>-P,N-DPPA)<sub>2</sub>(CH<sub>3</sub>CN)](PF<sub>6</sub>) (<b style="">3</b>) and [RuCl(η<sup>2</sup>-P,N-DPPA)(CH<sub>3</sub>CN)(PPh<sub>3</sub>)<sub>2</sub>](PF<sub>6</sub>) (<b style="">4</b>), respectively. The complexes (<b style="">3)</b> and<b style=""> (4) </b>have also been characterized by FTIR, ESI(+)MS,<sup> 1</sup>H and <sup>31</sup>P{<sup>1</sup>H} NMR spectra at room temperature. The complexes (<b style="">1)</b> and (<b style="">2) </b>are found to<b style=""> </b>have high catalytic activity towards the oxidation of aromatic alcohols with H<sub>2</sub>O<sub>2</sub>/NaOCl as oxidant. Maximum conversion of 95% can be achieved under mild reaction conditions.
Description: 444-452
Appears in Collections:IJC-A Vol.51A(03) [March 2012]

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