Syntheses, crystallography and spectroelectrochemical studies of ruthenium azomethine complexes

Mousa Z. Al-Noaimi, Haytham Saadeh, Salim F. Haddad, Musa I. El-Barghouthi, Mohammad El-khateeb, Robert J. Crutchley

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


Three novel families of azomethine ligands L of the type C6H5N{double bond, long}NC(COCH3){double bond, long}N(4-YC6H4) (6), C6H5N{double bond, long}NC(CO2CH3){double bond, long}N(4-YC6H4) (7) and 4-ClC6H4N{double bond, long}NC(CO2CH3){double bond, long}N(4-YC6H4) (8), [Y = H (a), CH3 (b), Cl (c), Br (d), C10H7 (e), OCH3 (f), NO2 (g)] have been synthesized and reacted consecutively with RuCl3, 2,2′-bipyridine (bpy) and lithium chloride in ethanol under refluxing conditions to produce three novel families of trans-[RuII(bpy)LCl2] complexes. These complexes were characterized by elemental analysis, IR, 1H NMR, UV-Vis spectroscopy and cyclic voltammetry. Crystallographic studies of two ruthenium(II) azomethine complexes (13 and 18) show that the Ru(II) ion occupies a distorted octahedral coordination sphere in which the chloride ligands are trans to each other and the azomethine and bipyridine nitrogen donor atoms are equatorially coordinated. Crystallographic, electrochemical, electronic spectral data and time-dependent DFT calculations are all consistent with azomethine ligands possessing strong π-acceptor properties. These π-acceptor properties can be "tuned" by a judicious choice of substituents on the azomethine ligand.

Original languageEnglish
Pages (from-to)3675-3685
Number of pages11
Issue number14
Publication statusPublished - Aug 31 2007
Externally publishedYes


  • Azomethine
  • Complexes
  • Electrochemistry
  • Ruthenium
  • Spectroelectrochemistry
  • X-ray structures

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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