摘要
Two mononuclear Mn compounds of Mn III （salen）（L 1） and Mn III （salen）（L 2） （H 2 salen=N,N-ethylenebis-（salicylideneaminato）,L 1=4-（2-hydroxybenzylideneamino）benzoic acid and L 2=4-（2-hydroxybenzylideneamino）-2-hydroxybenzoic acid） have been prepared and characterized by X-ray crystallography.Both compounds crystallize in the monoclinic system,space group P2 1 /c with a=14.351（4）,b=14.955（3）,c=11.869（3） and β=91.529（3）° for 1;and those for 2：a=14.439（9）,b=15.217（9）,c=11.660（7） and β=91.648（1）°.The compounds have similar structures,in which the Mn III 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 L 1 or L 2 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 [E 0 （O 2 /O 2 ·）] and 0.65 V [E 0 （1 O 2 /O 2 ·）],which suggest that 1 and 2 could be potential mimics of Mn-SOD.
Two mononuclear Mn compounds of Mn III （salen）（L 1） and Mn III （salen）（L 2） （H 2 salen=N,N-ethylenebis-（salicylideneaminato）,L 1=4-（2-hydroxybenzylideneamino）benzoic acid and L 2=4-（2-hydroxybenzylideneamino）-2-hydroxybenzoic acid） have been prepared and characterized by X-ray crystallography.Both compounds crystallize in the monoclinic system,space group P2 1 /c with a=14.351（4）,b=14.955（3）,c=11.869（3） and β=91.529（3）° for 1;and those for 2：a=14.439（9）,b=15.217（9）,c=11.660（7） and β=91.648（1）°.The compounds have similar structures,in which the Mn III 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 L 1 or L 2 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 [E 0 （O 2 /O 2 ·）] and 0.65 V [E 0 （1 O 2 /O 2 ·）],which suggest that 1 and 2 could be potential mimics of Mn-SOD.
基金
supported by the National Natural Science Foundation of China (No. 20633020)
the Science & Technology Innovation Foundation for the Young Scholar of Fujian Province (No. 2007F3112)
the Natural Science Foundation of Fujian Province (No. 2008J0175)
