【摘 要】
：
Two mononuclear Mn compounds of MnⅢ(salen)(L1) and MnⅢ(salen)(L2) (H2salen =N,N-ethylenebis-(salicylideneaminato), L1= 4-(2-hydroxybenzylideneamino)benzoic ac
【机 构】
：
State Key Laboratory of Structural Chemistry
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Two mononuclear Mn compounds of MnⅢ(salen)(L1) and MnⅢ(salen)(L2) (H2salen =N,N-ethylenebis-(salicylideneaminato), L1= 4-(2-hydroxybenzylideneamino)benzoic acid and L2 = 4-(2-hydroxybenzylideneamino)-2-hydroxybenzoic acid) have been prepared and characterized by X-ray crystallography. Both compounds crystallize in the monoclinic system, space group P21/c with a = 14.351(4), b = 14.955(3), c = 11.869(3)(A°) and β= 91.529(3)°a for 1; and those for 2: a=14.439(9), b =15.217(9), c= 11.660(7)(A°) and β= 91.648(1)°. The compounds have similar structures, in which the MnⅢ center adopts a distorted square-pyramidal geometry with the basal plane constructed by two N and two O atoms from the salen ligand and the apical position occupied by the carboxylate O atom from L1 or L2 ligand. The voltammetric behavior of the compounds is examined, which shows quasi-reversible one-electron reduction of Mn(Ⅲ) to Mn(Ⅱ). The reduction potentials of both compounds fall between -0.33 V [E0(O2/O2·-)] and 0.65 V [E0(1O2/O2·-)], which suggest that 1 and 2 could be potential mimics of Mn-SOD.
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