Synthesis, spectroscopic characterization and EPR studies on electron transfer reactions of bis[N-(2,5-di-tert-butylphenyl)salicylaldiminato]copper complexes with PPh3

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Kasumov V. T., Köksal F.

Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, vol.58, no.10, pp.2199-2211, 2002 (SCI-Expanded)

• Publication Type: Article / Article
• Volume: 58 Issue: 10
• Publication Date: 2002
• Doi Number: 10.1016/s1386-1425(01)00689-8
• Journal Name: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
• Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
• Page Numbers: pp.2199-2211
• Keywords: ESR, Optical spectra, Reactivities of copper(II) complexes toward PPh3, Redox-active bis(salicylaldiminato)copper(II) complexes
• Ondokuz Mayıs University Affiliated: No

Abstract

New bidentate N-(2,5-di-tert-butylphenyl)salicylaldimines bearing X = H, HO, CH3O, Br, NO2, 3,5-di-Br, 3-NO2-5-Br and 5,6-benzo substituents on the salicylaldehyde moiety, LxH, and their mononuclear bis[N-(2,5-di-tert-butylphenyl)salicylaldiminato]copper(II) complexes, Cu(Lx)2, have been prepared and investigated by IR, UV-Visible, 1H NMR, ESR spectroscopy, magnetic measurements, as well as reactions of Cu(Lx)2 with PPh3 were studied. It has been found that some complexes with X = HO and CH3O unlike their electron-withdrawing and unsubstituted analogues are readily reduced by PPh3 via intramolecular electron transfer from ligand to copper(II) to give Cu-stabilized radical intermediates. The spectra of the primary radicals interpreted in terms of couplings of unpaired electron with 63,65Cu, 31P, 14N nuclei and aromatic protons. © 2002 Elsevier Science B.V. All rights reserved.