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中文摘要：
[Ru（phen）2dppz]^2＋在水溶液中几乎不发光，加入DNA后光致发光强度大幅度增强，被称为“DNA分子光开关”此类配合物在DNA结构探针、DNA错配的检测、DNA定量分析、分子逻辑门、DNA-蛋白质的键合标记和新型光电器件等方面有非常重要的应用前景，已成为生物无机化学领域中的研究热点．
英文摘要：
The dimerization of a well-known DNA light-switch [ Ru（phen） 2dppz]^2 ＋（ phen = 1,10-phenanthroline, dppz = dipyrido [ 3,2-a ： 2＇, 3＇-c] phenazine）, and its effect on calf thymus binding properties were studied by UV-Vis and emission spectroscopy in Tris-HCl buffered 50 mmol/L NaCI（pH = 7. 1 ）. The results show that the complex has a strong tendency to dimerize with a dimerization constant of （1.8±0.3 ） × 10^6 L/ mol at the same order of magnitude as the DNA binding constant of （6.0 ± 1.2） × 10^6 L/mol for the Ru（ Ⅱ ） complex dimer, but one order of magnitude less than （4. 9 ±1.5 ） × 10^7 L/mol for the Ru（ Ⅱ ） complex monomer. This study has provided insight into a fundamental but important issue that should be taken into account for the DNA binding studies.
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