L-Amino acids as inexpensive and readily available natural products showed significant chiral induction and stereodirecting abilities. The Mn (Ⅲ)-Schiff-base complexes 3b and c assembled with L-amino acid ethyl esters were found to be highly effective catalysts for the enantioselective epoxidation of conjugated olefins while the corresponding binuclear-Mn (Ⅲ) complexes showed lower enantioselectivity.

Three novel chiral binuclear MN(Ⅲ)-Schiff-base complexes have been synthesized and the application of these complexes in the asymmctric epoxidation of trans-stibenc is described, catalytic mcchanism is also discussed bricfly.

A novel La (Ⅲ) complex of chrysin (5,7-dihydroxyflavone) was synthesized and characterized by UV, IR, H NMR, thermogravimetry/differential thermal analysis (TG/DTA) and elementary analyses. The interactions of the La (Ⅲ) complex and chrysin with calf thymus DNA were investigated by spectrophotometric methods and viscosity measurements. The intrinsic binding constants of La (Ⅲ) complex 6 5 21 and chrysin are 1.29310 and 5.44310 M, respectively. Experimental results indicated that La(III) complex and chrysin can both bind to DNA by intercalation modes, but the binding affinity of La (Ⅲ) complex is much higher than that of chrysin. Comparative antitumor activities of La (Ⅲ) complex and chrysin were tested by MTT and SRB methods. The results show that at the concentration of 10 mM for chrysin and La (Ⅲ) complex, the inhibitory ratios of La (Ⅲ) complex against the tested tumor cells were higher than those of chrysin.

A new chelating ligand, 3,5-dibenzyloxybenzoyl-2,4-dihydroxybenzal-dehyde hydrazone (H2L), and its five transition metal complexes, M(HL) (OAc) [M=Co(Ⅱ), Ni (Ⅱ), Cu(Ⅱ), Zn(Ⅱ), Mn(Ⅱ)], have been prepared and characterized on the basis of elemental analyses, magnetic moment, molar conductiyvity, IR, 1H NMR and electronic spectra. Structures of the prepared complexes are suggested. The antibacterial activites of the prepared compounds were tested, and the results are discussed.

In the title compound, 6,6'-bis (methoxymethl)-4,4'-dimethyl-2,2'-[Ni(C34H34N2O4)], there are two independent molecules per asymmetric unit; both have a twofold axis. These molecular structures are two rotamers in the presence of steric repulsions between the ether groups, and the coordination geometry around the Ni11 atom is slightly tctracedrally distorted square planar. The rotamers are stacked alternately along the caxis.