Inorganic Chemistry, Vol.45, No.6, 2373-2375, 2006
Influence of the electrochemical conversion of [(LH)(MnCl2)-Cl-II] into [(L)(MnCl)-Cl-III](+) on the protonic state of a phenol-containing ligand
A bischloromanganese(II) complex [(LH)MnCl2] (1), where LH is the pentadentate ligand N,N-bis(2-pyridyimethyl)-N'-salicylidene-ethane-1,2-diamine, has been synthesized. Elemental analysis, UV-visible, and cyclic voltammetry experiments showed that the phenol function of the ligand LH remains protonated. Exhaustive electrolysis at 1.0 V vs SCE led to the formation of the Mn-III derivative [(L)MnCl](+) (3) with the concomitant expulsion of H+ and Cl-. The formation of the Mn-III species was confirmed by UV-visible spectroscopy and X-ray crystallography. Complex 1 could be regenerated by the reduction of complex 3 in the presence of H+ and Cl-.