Spectroscopic and electron-transfer reactivity studies of bulky bis(N-cycloalky1-3,5-Bu-t(2)-salicylaldiminato)copper(II) complexes: Generation of uncoordinated and coordinated phenoxyl radicals

Kasumov V. T., Koksal F., Kutluay A.

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, vol.76, no.2, pp.99-106, 2010 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 76 Issue: 2
  • Publication Date: 2010
  • Doi Number: 10.1016/j.saa.2010.02.016
  • Journal Name: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.99-106
  • Keywords: Bis[N-cycloalkyl-3,5-Bu-t(2)-salicylaldiminato]Cu(II) complexes, Phenoxyl radicals, Spectroscopy, Redox reactivity, COPPER(II) COMPLEXES, REDOX PROPERTIES, SPIN-RESONANCE, ABSORPTION, TRANSITION, CHEMISTRY, CATALYSIS, SPECTRA, ANALOGS
  • Ondokuz Mayıs University Affiliated: Yes

Abstract

This work summarizes the results of our studies on the spectral, magnetic, electrochemical and chemical redox properties of N-cycloalkyl-3,5-Bu-t(2)-salicylaldimine ligands [cycloalkyl = cyclo-C5H9(HL1), cyclo-C6H11 (HL2), cyclo-C7H13 (HL3), cyclo-C8H15 (HL4), 1-adamantyl (HL5), 2-adamantyl (HL6)] and their copper(II) complexes (1-6). The compounds have been characterized by IR, H-1 NMR, UV-vis, EPR spectroscopy, electrochemical and magnetic susceptibility measurements. The geometry of 1-6, according to their EPR (g(parallel to) and g(parallel to)/A(parallel to)) and visible spectral data, exhibit a significant amount distortion from slightly distorted square-planar to pseudo-tetrahedral. The cyclic voltammetric studies of 1-6 reveal that as the extent of the tetrahedral distortion of Cu-II center increases on going from 1 to 5, the values of Cu-II/Cu-I potentials became more negative. The compounds have been oxidized electrochemically and chemically and the generated relatively stable uncoordinated phenoxyl [HLx](center dot+) and coordinated Cu(II)-phenoxyl radical [1-6](center dot+) species have been characterized by UV/vis and EPR spectroscopy. (C) 2010 Elsevier B.V. All rights reserved.