Synthesis and spectroscopic DNA binding studies of [Ru(phen)2(tbtc)]2+ and [Ru(2,9-dmp)2(tbtc)]2+ |
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Authors: | Tan Li-Feng Wang Fang Su Guo-Jun Chao Hui Zhang Sheng |
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Institution: | College of Chemistry, Xiangtan University, Xiangtan 411105, PR China. lfwyxh@yahoo.com.cn |
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Abstract: | A new polypyridyl ligand tbtc (tbtc=4,5,9,14-tetraaza-benzob]triphenylene-11-carboxylic acid methyl ester) and its complexes Ru(phen)2(tbtc)]2+ (1) (phen=1,10-phenanthroline) and Ru(2,9-dmp)2(tbtc)]2+ (2) (2,9-dmp=2,9-dimethyl-1,10-phenanthroline) were synthesized and characterized by element analysis, MS, and 1H NMR. The DNA binding properties of both complexes to calf thymus DNA (CT-DNA) were investigated by different spectrophotometric methods and viscosity measurements. The results suggest that both complexes bind to DNA via an intercalative mode, and the DNA binding affinity of complex 1 is much greater than that of complex 2. This difference in binding affinity probably was caused by the different ancillary ligands. Also, when irradiated at 365 nm, complex 1 was found to be a more-effective DNA-cleaving agent than complex 2. |
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