Ruthenium(II) complexes of a-diimine: synthesis, spectral characterisation, electrochemical properties and single crystal X-ray structure of bis(2,2-bipyridine){N(1)-alkyl-2-(arylazo)imidazole}ruthenium(II) perchlorate

S Pab, TK Misra, C Sinha, Alexandra Martha Zoya Slawin, John Derek Woollins

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

Mixed-ligand tris-chelates, [Ru(bpy)(2)(RaaiR')](ClO4)2 . H2O (bpy = 2,2'-bipyridine; RaaiR' = 1-alkyl-2-(arylazo)imidazole) have been synthesized by a silver-assisted route [Ru(bpy)(2)Cl-2 + RaaiR' + AgNO3 + NaClO4/Ru(bpy)(2)Cl-2 + [Ag(RaaiR')(2)](ClO4)]. The structures of the complexes have been supported by the single-crystal X-ray diffraction study and the stereochemistry are assessed by H-1 NMR spectral data. All the complexes show two metal-to-ligand charge transfer (MLCT) transitions in the visible region at ca. 400 and 500 nm and their emission spectra are also described here. Cyclic voltammetric studies exhibit high-potential Ru-III/II (1.4 V vs. SCE) and three successive ligand reductions at negative to SCE in acetonitrile solution. The difference in the first metal and successive ligand redox potentials are linearly correlated with the nu(CT) of MLCT band. (C) 2000 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)1925-1933
Number of pages9
JournalPolyhedron
Volume19
Publication statusPublished - 15 Sept 2000

Keywords

  • azoimine
  • Ru-bipyridine
  • tris-chelates
  • x-ray structures
  • electrochemistry
  • emission spectra
  • SPECTROSCOPIC PROPERTIES
  • 2,2'-BIPYRIDINE LIGANDS
  • TERTIARY PHOSPHINES
  • REDOX PROPERTIES
  • EXCITED-STATES
  • CHEMISTRY
  • AZOIMIDAZOLES
  • 1,10-PHENANTHROLINE
  • MONONUCLEAR
  • TRANSITION

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