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Articles by Yun-Jun Liu
Total Records ( 3 ) for Yun-Jun Liu
  Yun-Jun Liu , Jian-Feng He , Jun-Hua Yao , Wen-Jie Mei , Fu-Hai Wu and Li-Xin He
  Two polypyridine ruthenium(II) complexes, [Ru(dmp)2(MCMIP)]2+ (1) (MCMIP = 2-(6-methyl-3-chromonyl)imidazo[4,5-f][1,10]-phenanthroline, dmp = 2,9-dimethyl-1,10-phenanthroline) and [Ru(dmb)2(MCMIP)]2+ (2) (dmb = 4,4′-dimethyl-2,2′-bipyridine), have been synthesized and characterized by elemental analysis, ES-MS and 1H NMR. The DNA-binding behaviors of these complexes were investigated by electronic absorption titration, fluorescence spectroscopy, viscosity measurements and thermal denaturation. The results show that 1 and 2 effectively bind to CT-DNA; the DNA-binding affinities are closely related to the ancillary ligand.
  YI Liu , Yun-Jun Liu , Jun-Hua Yao , Wen-Jie Mei and Fu-Hai Wu
  Two Ru(II) complexes [Ru(dmb)2(dtmi)](ClO4)2 (1) (dmb = 4, 4’-dimethyl-2, 2’-bipyridine, dtmi = 3-(pyrazin-2-yl)-as-triazino[5, 6-f]-5-methoxylisatin) and [Ru(dmb)2(dtni)](ClO4)2 (2) (dtni = 3-(pyrazin-2-yl)-as-triazino[5, 6-f]-5-nitroisatin) have been synthesized and characterized by elemental analysis, ES-MS, and 1H NMR. DNA-binding behaviors of these complexes have been investigated by spectroscopic titration, viscosity measurements, and thermal denaturation. The results indicate that the two complexes interact with calf thymus DNA by intercalation.
  Zhen-Hua Liang , Zheng-Zheng Li , Hong-Liang Huang and Yun-Jun Liu
  Two new ruthenium(II) complexes, [Ru(dmp)2(APIP)](ClO4)2 (1) (APIP = 2-(2-aminophenylimidazo[4,5-f][1,10]phenanthroline), dmp = 2,9-dimethyl-1,10-phenanthroline) and [Ru(dmp)2(HAPIP)](ClO4)2 (2) (HAPIP = 2-(2-hydroxyl-5-aminophenyl)imidazo[4,5-f][1,10]phenanthroline), were synthesized and characterized. The DNA-binding properties of these complexes were investigated by absorption titration, viscosity measurements, and photoactivated cleavage. The DNA-binding constants for 1 and 2 have been determined to be 2.3 (± 0.3) x 104 (mol L−1)−1 and 3.3 (± 0.4) x 104 (mol L−1)−1. The results indicate that 1 and 2 interact with DNA through intercalative mode. The cytotoxicities of 1 and 2 were assessed against BEL-7402, HepG-2 and MCF-7 cell lines using standard MTT assay. The apoptosis induced by these complexes was studied with the acridine orange/ethidium bromide staining method. The antioxidant activity on hydroxyl radical was also investigated.
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