Synthesis, spectral and electrochemical studies of ruthenium(II)/(III) complexes of alicyclic β-ketamines

Abstract

A series of ruthenium(II)/(III) complexes of alicyclic β-ketamines derived from 2-formylcyclohexanone and 4-X-substituted anilines, HFCA-X (where H is an ionisable enolichydrogen and X = H, Cl, Br, OMe and NO₂) , have been prepared and characterized by spectroscopic techniques. The IR spectral data suggest the coordination of enolic oxygen and imino nitrogen to ruthenium. Ruthenium(I I) complexes are diamagnetic (low spin <i>d</i>⁶<i>, </i>S = 0) and in solutions show intense MLCT transition. Their redox behaviours have been studied by cyclic voltammetry. The solid state low temperature ESR spectra of Ru(III) complexes show a low spin symmetry.