Phthalazin-1(2H)-one was prepared by a novel route. The La(III)-complex of phthalazin-1(2H)-one, [La(NO3)(3)center dot 4H(2)O center dot C8H7-N2O]center dot H2O, was synthesized and characterized on the basis of elemental analysis, thermal analyses (TG/DTA) and X-ray crystallography. In the complex, the coordination number of the La(III) ion is eleven. The interaction of the ligand and its complex with calf thymus DNA was investigated by spectrophotometric methods and viscosity measurements, respectively. Experimental results indicated that phthalazin-1 (2H)-one and the complex can bind to DNA by intercalation modes, but the binding affinity of La(III)complex is higher than that of the ligand. Comparative antitumor activities of La(III)-complex was investigated by HL-60 and A-549. IC50 = 2.6 x 10(-8), 3.3 x 10(-5) mg/mL are given. (c) 2005 Elsevier B.V. All rights reserved.
Synthesis, characterization and DNA-binding studies of 2-carboxybenzaldehydeisonicotinoylhydrazone and its La(III), Sm(III) and Eu(III) complexes
作者:Yuan Wang、Yan Wang、Zheng-Yin Yang
DOI:10.1016/j.saa.2006.02.062
日期:2007.2
2-Carboxybenzaldehydeisonicotinoylhydrazone (HL), and its three lanthanide complexes, LnL(3)(.)4H(2)O [Ln = La(1), Sm(2), Eu(3)], have been synthesized and characterized on the basis of elemental analyses, molar conductivities, IR spectra and thermal analyses. In addition, the DNA-binding properties of the ligand and its complexes have been investigated by absorption, fluorescence and viscosity measurements. The experimental results indicated that the complexes (2) and (3) can bind to DNA, but the ligand and the complex (1) cannot; the binding affinity of the complex (3) is higher than that of the complex (2) and the intrinsic binding constant K-b of the complex (3) is 7.86 x 10(4) M-1. (c) 2006 Elsevier B.V. All rights reserved.