Solvent, anion, and structural effects on the redox potentials and UV-visible spectral properties of mononuclear manganese corroles.
A series of manganese(III) corroles were investigated as to their electrochemistry and spectroelectrochemistry in nonaqueous solvents. Up to three oxidations and one reduction were obtained for each complex depending on the solvents. The main compound discussed in this paper is the meso-substituted manganese corrole, (Mes 2PhCor)Mn, and the main points are how changes in axially coordinated anion and solvent will affect the redox potentials and UV-vis spectra of each electrogenerated species in oxidation states of Mn(III), Mn(IV), or Mn(II). The anions OAc (-), Cl (-), CN (-), and SCN (-) were found to form five-coordinate complexes with the neutral Mn(III) corrole while two OH (-) or F (-) anions were shown to bind axially in a stepwise addition to give the five- and six-coordinate complexes in nonaqueous media. In each case, complexation with one or two anionic axial ligands led to an easier oxidation and a harder reduction as compared to the uncomplexed four-coordinate species.
Shen
Jing
J
Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
El Ojaimi
Maya
M
Chkounda
Mohammed
M
Gros
Claude P
CP
Barbe
Jean-Michel
JM
Shao
Jianguo
J
Guilard
Roger
R
Kadish
Karl M
KM