Coordination equilibria and activity coefficients in MCl2+ isoquinoline + chlorobenzene systems

Abstract

U.v. and visible spectra, and solubility isotherms are reported for MCl₂+ isoquinoline (IQ)+ chlorobenzene systems (M = Co, Ni, Mn, Zn). The solvent dependent activity coefficients of the pseudo-octahedral [MCl₂(IQ)₄] and pseudo-tetrahedral [MCl₂(IQ)₂] solution complexes were determined and were found to be independent of the central metal atom. The solubility data were used together with the spectrophotometric results to calculate the thermodynamic constants of the configurational equilibrium [MCl₂(IQ)₄]⇄[MCl₂(IQ)₂]+ 2(IQ) for M = Co, Ni and Mn.