Ruthenium(II) Complexes of O,N-donor Schiff base ligands and their use as catalytic organic oxidants

El‐Hendawy, Ahmed M.; Alkubaisi, Abdulla H.; El-Kourashy, Abd El-Ghany; Shanab, Mai M.

doi:10.1016/s0277-5387(00)83051-x

Cited by 84 publications

(28 citation statements)

References 41 publications

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“…This was further supported by spectroscopic changes that occur on addition of NMO to a dichloromethane solution of the ruthenium(II) complexes. The appearance of a band at 390 nm in UV-vis spectra is attributed to the formation of highvalent Ru IV =O species, which was also found for other oxo ruthenium(IV) complexes [41,42]. Further support comes from FT-IR of the solid (obtained by evaporation of the resultant solution to dryness), which shows a band at 860 cm -1 , characteristic of Ru IV =O species (Scheme 3) [38], which is absent in the ruthenium catalyst.…”

Section: Catalytic Oxidationsupporting

confidence: 60%

Synthesis, spectral characterization and catalytic studies of new ruthenium(II) chalcone thiosemicarbazone complexes

Muthukumar

Viswanathamurthi

2010

Open Chemistry

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C NMR) methods. On the basis of data obtained, an octahedral structure was assigned for all of the complexes. The chalcone thiosemicarbazones behave as dianionic tridentate O, N, S donors and coordinate to ruthenium via the phenolic oxygen of chalcone, the imine nitrogen of thiosemicarbazone and thienol sulfur. The new complexes exhibit catalytic activity for the oxidation of primary and secondary alcohols to their corresponding aldehydes and ketones and they were also found to be efficient catalysts for the transfer hydrogenation of carbonyl compounds.

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Section: Catalytic Oxidationsupporting

confidence: 60%

Synthesis, spectral characterization and catalytic studies of new ruthenium(II) chalcone thiosemicarbazone complexes

Muthukumar

Viswanathamurthi

2010

Open Chemistry

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“…This band disappears in the cases of the corresponding complexes, suggesting the coordination of the metal ion through the O phenolic atoms. The stretching vibration bands of the azomethine group is shifted to lower wavenumbers, indicating that the nitrogen atoms are involved in the coordination [14][15][16][50][51][52][53] leading to OONN tetradentate ligands. On the opposite side, a shift to higher values of the ν(C-O) vibration bands of phenoxy groups was observed, corresponding to the simultaneous strengthening of the electronic density of these bonds and coordination of the oxygen atoms to the metallic center.…”

Section: Infrared Spectramentioning

confidence: 99%

“…In some steps, molecular dioxygen fixation, water elimination, and peroxo high oxidation state metal (i.e., Fe IV ) and so forth, are involved In all cases, the active form of the coordinated iron ion is axially linked to a sulfur protein. Therefore, a large number of cytochrome P450 oxocomplexes, including the nonporphyrinic ligands such as Schiff base complexes, have been tested for their catalytic activity [13][14][15][16][17] and their electrocatalytic properties [8,[17][18][19][20][21][22][23][24][25][26]. Thus, new catalysts deriving from symmetrical tetradentate ruthenium-Schiff base complexes seem to be more and more attractive and efficient in catalysis [27,28].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Electrochemical Study of Tetradentate Ruthenium‐Schiff Base Complexes: Dioxygen Activation with a Cytochrome P450 Model Using 1‐ or 2‐Methylimidazole as Axial Bases

Ourari

Khelafi

Aggoun

et al. 2011

Advances in Physical Chemistry

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Salicylaldehyde, 2-hydroxyacetophenone, and 3,5-dichlorosalicylaldehyde react with 1,2-diaminoethane to give three symmetrical Schiff bases H 2 L 1 , H 2 L 2 , and H 2 L 3 , respectively. With Ru(III) ions, these ligands lead to three complexes: Ru(III)ClL 1 (1), Ru(III)ClL 2 (2), and Ru(III)ClL 3 (3). The purity of these compounds was estimated by TLC technique and microanalysis while their structures were supported by the usual spectroscopic methods such as NMR, infrared, and electronic spectra. The cyclic voltammetry in acetonitrile showed irreversible waves for all three ligands. Under the same experimental conditions, it was proved that the ruthenium is coordinated in the three complexes 1, 2, and 3 showing quasireversible redox systems. The behavior of these complexes and their comparison with cytochrome P450 are investigated using them as catalysts in the presence of molecular oxygen with an apical nitrogen base: 1-or 2-methylimidazole.

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“…These bases and their metal complexes may be involved as catalysts for many reactions [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Crystal structure of a new pentadentate symmetrical: di[4-(phenylimino)pentan-2-one] ether. Structural and electrochemical studies of its CoII, NiII, CuII and CdII complexes

Kaabi

Douadi

Haffar

et al. 2007

Transition Met Chem

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The crystal structure of a new symmetrical pentadentate N 2 O 3 Schiff base: di[4-(phenylimino)pentan-2-one] ether (H 2 L) is described. In the solid state, the ligand appears as a keto-imine tautomer, while in DMSO solution, the eneamine form is observed. This ligand coordinates cobalt(II), nickel(II), copper(II) and cadmium(II). The structures of these new complexes are described using infrared and electronic spectroscopy, 1 H-n.m.r. and d.s.c. The cyclic voltammograms of the ligand and the complexes in DMF are discussed.

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Ruthenium(II) Complexes of O,N-donor Schiff base ligands and their use as catalytic organic oxidants

Cited by 84 publications

References 41 publications

Synthesis, spectral characterization and catalytic studies of new ruthenium(II) chalcone thiosemicarbazone complexes

Synthesis, spectral characterization and catalytic studies of new ruthenium(II) chalcone thiosemicarbazone complexes

Synthesis, Characterization, and Electrochemical Study of Tetradentate Ruthenium‐Schiff Base Complexes: Dioxygen Activation with a Cytochrome P450 Model Using 1‐ or 2‐Methylimidazole as Axial Bases

Crystal structure of a new pentadentate symmetrical: di[4-(phenylimino)pentan-2-one] ether. Structural and electrochemical studies of its CoII, NiII, CuII and CdII complexes

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