Complexes of Mn(II) and Mn(III) with the Schiff base N-[2-(3-ethylindole)]pyridoxaldimine. Electrochemical study of these and related Ni(II) and Cu(II) complexes

Gili, Pedro; Reyes, María-Belen; Zarza, P. Martin; Silva, M.F.C. Guedes da; Tong, Ye‐Xiang; Pombeiro, Armando J. L.

doi:10.1016/s0020-1693(96)05374-1

Cited by 25 publications

(12 citation statements)

References 33 publications

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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%

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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Section: Infrared Spectramentioning

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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“…In this case, the band corresponding to the C=N stretching vibration for the azomethine group -N=CH- [30][31][32][33][34] is shifted to lower wavenumbers (2-12 cm )1 ), while its intensity decreases. In the meantime the m(C-O) vibration shifts to higher wavenumbers.…”

Section: Infrared Spectramentioning

confidence: 99%

Unsymmetrical Tetradentate Schiff Base Complexes Derived from 2,3-diaminophenol and Salicylaldehyde or 5-bromosalicylaldehyde

Ourari¹,

Ouari²,

Moumeni³

et al. 2006

Transition Met Chem

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Salicylaldehyde or 5-bromosalicylaldehyde reacted with 2,3-diaminophenol in absolute EtOH in a 2:1 molar ratio to give new unsymmetrical Schiff bases (H 2 L). The bases were used as ligands to coordinate Mn(III), Ni(II) and Cu(II) chlorides leading to [Mn III ClL] AE EtOH and [M II L] or [M II L] AE 2H 2 O (M=Ni or Cu) complexes. Their structures were determined using mass spectroscopy, IR, u.v.-vis and 1 H-n.m.r. The cyclic voltammetry in acetonitrile showed irreversible waves for both ligands. Under the same experimental conditions, the complexes exhibited mainly the non-reversible reduction of the Ni(II) or Cu(II) ion to Ni(0) or Cu(0), while the reduction of Mn(III) to Mn(II) was found to be a quite reversible phenomenon.

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“…The bands in the 1282, 1284, 1620, and 1631 cm −1 regions are assigned to the stretching vibrations ν(C-O) and ν(C=N) of H 2 L1 and H 2 L2, respectively (Table 2). The ν(C=N) band of the ligands undergoes small shifts to lower frequencies in the spectra of the complexes (1600-1572 cm −1 ), indicating coordination of the imine nitrogen [28][29][30][31]. Additional evidence for coordination of the nitrogen is the presence of a ν(M-N) band in the 437-497 cm −1 region.…”

Section: Infrared Spectramentioning

confidence: 96%

Synthesis, Characterization and Electrochemical Behavior of CoII, NiII and CdII Complexes with N2O2 Donor Ligands Derived from 4,4′-Diaminobiphenyl and 2-Hydroxybenzaldehyde or 2,4-Dihydroxybenzaldehyde

et al. 2010

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Complexes of Mn(II) and Mn(III) with the Schiff base N-[2-(3-ethylindole)]pyridoxaldimine. Electrochemical study of these and related Ni(II) and Cu(II) complexes

Cited by 25 publications

References 33 publications

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

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

Unsymmetrical Tetradentate Schiff Base Complexes Derived from 2,3-diaminophenol and Salicylaldehyde or 5-bromosalicylaldehyde

Synthesis, Characterization and Electrochemical Behavior of CoII, NiII and CdII Complexes with N2O2 Donor Ligands Derived from 4,4′-Diaminobiphenyl and 2-Hydroxybenzaldehyde or 2,4-Dihydroxybenzaldehyde

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