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IJC-A Vol.51A [2012] >
IJC-A Vol.51A(03) [March 2012] >
| 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,
[RuCl2(η2-P,N-DPPA)2] (1) and [RuCl2(η2-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 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| Source: | IJC-A Vol.51A(03) [March 2012]
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