Three complexes of Mn（Ⅱ）with L-amino acid[L-Isoleucine（L-Ile）,L-Methionine（L-Met）,L-Tryptophan（L-Trp）]were synthesized and characterized by elemental analysis,infrared spectra and gravithem metrical analyses.The catalytic activity of the three complexes for disproportionation of O2-was determined by NBT method.The result shows that the complexes have a high SOD-like activity,and the KQ values of complexes 1,2 and 3 are 0.78×107mol-1·L·s-1,1.28×107mol-1,and 1.50×107mol-1L·s-1,respectively.
Two novel complexes [Cu（TATP）（L-Leu）（H2O）]NO3·H2O and [Cu（TATP）L-Met)（H2O）]NO3·0.5H2O（TATP=1,4,8,9-tetraazatriphenylene,L-Leu=L-Leucinate,L-Met=L-Methioninate）were synthesized and characterized by elemental analysis,molar conductivity,infrared absorption spectrum,electronic absorption spectrum and DTA-TGA.The results showed that both of the complexes had a distorted square-pyramidal geometry with two nitrogen atoms of TATP and one amino nitrogen and one carboxylate oxygen atoms of L-Leu/L-Met at the equatorial positions,and one water oxygen at the axial position.The SOD-Like activity of the complexes was determined by NBT-illumination method.The result indicated that the complexes possessed excellent SOD-like activity and showed 50% inhibition ration in the concentration of 0.355 μmol·L-1 and 0.185 μmol·L-1,respectively.The greater SOD-like activity of the complex[Cu（TATP）（L-Leu）（H2O）]NO3·H2O may be attributed to the smaller spatial hindrance of the side-chain group of L-Met.
