Copper-Azide-Thioarylazoimidazoles - Structure, Spectra, Redox Properties, Magnetism and Theoretical Interpretation

Prasenjit Bhunia, Debasis Banerjee, Papia Datta, Pallepogu Raghavaiah, Alexandra M. Z. Slawin, John D. Woollins, Joan Ribas, Chittaranjan Sinha

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Azido-copper(II) and -copper(I) complexes of 1-alkyl-2-[(o-thioalkyl)phenylazo]imidazole (SRaaiNR') have been prepared and studied. Complex 2 [Cu(SRaaiNR')(mu(1,1)-N-3)(N-3)](2) dimerises via end-to-end (mu(1,3))-N-3 to form a tetrameric structure. Azido-copper(I) complexes of the ligands are obtained MeOH-bridged dimers, [Cu(SRaaiNR')(N-3)(mu-OHMe)](2) (3). The electronic spectra Suggest that a small reorganisation energy (0.08 eV) is associated with the change in electronic configuration, structure and oxidation state from Cu-II to Cu-I. Redox interconversion, Cu-II <-> Cu-I, [Cu(SMeaaiNMe)(mu-N-3)-(N-3)](2) (2a) <-> [Cu(SMeaaiNMe)(N-3)(mu-OHCH3)](2) (3a), has been performed in one case. The tetranuclear complex shows ferromagnetic and antiferromagnetic interactions. The spectra, redox chemistry and magnetism are explained by DFT studies.

Original languageEnglish
Pages (from-to)311-321
Number of pages11
JournalEuropean Journal of Inorganic Chemistry
Issue number2
DOIs
Publication statusPublished - Jan 2010

Keywords

  • Copper
  • Bridging ligands
  • Structure elucidation
  • Magnetic properties
  • Redox chemistry
  • TRANSITION-METAL-COMPLEXES
  • ELECTRON-TRANSFER KINETICS
  • CRYSTAL-STRUCTURE
  • CONTAINING LIGANDS
  • SULFUR-LIGATION
  • THIOETHER
  • COORDINATION
  • POTENTIALS
  • REDUCTION
  • SYSTEMS

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