Ruthenium(III) complexes: Synthesis, spectral, magnetic and electrochemical characterization.

Novel series of Ru(III) Schiff base chelate complexes of general formula [Ru (Schiff base-X) (Cl)₂ (As/P Ph₃)₂]; Schiff base ={2-[(4-N,N'-Schiff base)-methyl]-4-halo(X)-phenol}; X=I, Cl or Br were synthesised and anlysed by spectrochemical and electrochemical/cyclic voltametric characterization. Newly synthesized complexes are observed to absorb electromagnetic radiation intensely in the visible region leads to M → L charge transfer (MLCT) transition. The FTIR values discloses that the bidentate Schiff base ligands are coordinated and bind through the imine nitrogen atom along the deprotonated phenolic oxygen to the central metal atom ruthenium(III). The ESR spectral data reveals that the RuIII complexes displays three-line (g_x ≠ g_y ≠ g_z) designates magneto anisotropy with the electronic environment encompassing the ruthenium atom is an asymmetric environment. The µeff values 1.916 - 1.923 BM of these complexes designate paramagnetic with low spin having an unpaired electron. All complexes show the range of redox behavior of the value ranges - 0.826V to - 0.971V shows quasi reversible one electron metal centered (Ru^III/Ru^II) reduction. The elevated oxidation state of the complex is stabilized by ligands and the bottom oxidation state is balanced by co-ligands like PPh₃ and AsPh₃. [ABSTRACT FROM AUTHOR]