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Protonation of an oxo-bridged manganese complex or hydrolysis of monomeric manganese complex or monomeric manganese(III) octaethylporphyrinates results in the formation of (mu-hydroxo)bis(octaethylporphinato)manganese (III) perchlorate. X-ray diffraction data shows that each Mn(III) ion is axially coordinated with an Mn-O(H)-Mn bridge angle of 152.73(11) degree. The two porphyrin ring are nearly eclipsed. The Mn(III)...Mn(III) bond interaction in Mn(OEP)2(OH)CLO4 is fairly antiferromagnetic and is controlled by zero field-splitting effect.

The synthesis and characterization of the hydroxo-bridged complex, (mu-hydroxo)bis( tetraphenylprophinato manganese III ) perchlorate, are described. The complex has been prepared by the controlled hydrolysis of monomeric diaquo(tetraphenylporphinato)manganese(III) perchlorate. X-ray structure analysis showed two five-coordinate manganese(III) ions bridged by a single hydroxo ligand.

An investigation of the chloromanganese complexes as catalysts in the asymmetric epoxidation of 1,2-dihydronaphthalene by iodosylbenzene was conducted. High levels of stereoinduction were derived in the epoxidation of 1,2-dihydronaphthalene catalyzed by sterically crowded manganese chiroporphyrin catalysts. Assymetric induction was correlated to the degree of nonplanar distortion of the porphyrin free base in solution.