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铜、钴、镍金属配合物与脱氧核糖核酸作用机理的电化学及光谱研究
Electrochemical and Spectroscopic Studies on the Binding Mechanism of Metal Complexes of Copper, Cobalt and Nickel with Deoxyribonucleic Acid
【作者】 接贵芬;
【导师】 牛淑妍;
【作者基本信息】 青岛科技大学 , 分析化学, 2005, 硕士
【摘要】 脱氧核糖核酸(DNA)是生物最重要的遗传物质,它广泛存在于所有动物、植物细胞、微生物及生物体内,是储存、复制和传递遗传信息等生命过程的主要物质基础。而金属离子及其配合物在许多生命过程中起着核心作用,小分子特别是过渡金属配合物与DNA的键合和分子识别特性是生命科学中重要的研究课题。通常小分子与DNA作用有三种结合方式:嵌插作用、沟结合和静电作用。 (1) 合成了以四氮大环为配体的铜(Ⅱ)、钴(Ⅱ)、镍(Ⅱ)金属配合物,培养了单晶。通过晶体结构测定及红外(IR)测定,确定了四氮大环铜、四氮大环钴、四氮大环镍配合物的结构。利用电化学方法和光谱法研究了这些金属配合物与DNA的作用,确定了反应的条件、作用方式,测定了结合比和结合常数。结果表明,四氮大环的铜、钴、镍配合物的分子式分别是Cu(C16H32N4)I2·2H2O、Co(C16H32N4)·(CH)3COO)2·I3和Ni(C16H32N4)·I2。三种配合物与DNA作用后,配合物的伏安曲线峰电流均减小,式电位均负移;DNA的紫外特征吸收峰呈明显的减色效应,证明三种配合物和DNA作用的方式均为静电作用,结合比为1:1,结合常数分别为1.02×104L·mol-1、3.92×103L·mol-1和3.64×102L·mol-1。 (2) 利用电化学方法和光谱法研究了两种以席夫碱为配体的铜(Ⅱ)配合物与DNA的作用,确定了反应的条件、作用方式,测定了结合比和结合常数。结果表明,两种配合物和DNA作用的方式均为静电作用,结合比为1:1,结合常数分别为2.72×104L·mol-1和7.45×104L·mol-1。
【Abstract】 Deoxyribonucleic acid (DNA) is an important genetic substance in lives, and it exits in all cells of animals and plants, microorganisms and organisms extensively. It is the main material base of some life courses, such as storing, duplicating and transmitting hereditary information, etc.. While metal ions and metal complexes play key roles in the courses of a lot of lives. The binding of small molecules, especially transition metal complexes, to DNA and molecular identification are very important in life science. It is generally accepted that there are three kinds of binding modes for small molecules to DNA, which refer to intercalative binding, groove binding and electrostatic binding.(1)The metal complexes of copper (II), cobalt (II) and nickel (II) with tetranitrogen macrocyclic ligands have been synthesized, and the single crystals of the metal complexes have been prepared respectively. The structures of the macrocyclic complexes have been determined by means of crystalline structure and IR measurement. The interacions of these complexes with DNA have been studied by electrochemical and spectroscopic methods. The interacion conditions and interacion modes have been determined, the binding ratios and the binding constants have been measured. The results show that the formulas of the macrocyclic complexes of copper (II), cobalt (II) and nickel (II) are Cu(C16H32N4)I2·2H2O, Co(C16H32N4)·(CH3COO)2·I3 and Ni(C16H32N4)·I2 respectively. After the interaction of these complexes with DNA, the peak currents of the voltammetry curves of the complexes decreased with negative shifts of the
【Key words】 Metal complexes; DNA; Crystalline structure; Electrochemical method; Spectroscopic method; Electrostatic binding;
- 【网络出版投稿人】 青岛科技大学 【网络出版年期】2005年 06期
- 【分类号】Q523
- 【下载频次】335