甘氨酸与Cu(Ⅱ)配位反应的动力学研究

论文编号:CL057  论文字数:11238,页数:28

摘 要：用紫外-可见光谱法研究甘氨酸与Cu（Ⅱ）的配位反应。考察了温度、离子强度、组成比及pH值等对配位反应的影响。结果表明：当离子强度为I=0.1M、甘氨酸与Cu（Ⅱ）组成比（Gly／Cu）为2：1、pH=7.0时反应的速率常数最大，而温度对配位反应的影响表现不是很突出。甘氨酸与Cu（Ⅱ）的配位反应为二级反应，反应活化能为7.009KJ/mol，自由能△G≠为4.321KJ/mol。本文提出了甘氨酸与Cu（Ⅱ）配位反应的合理机理，为高纯甘氨酸铜的制备提供理论依据。

关键词：甘氨酸铜；紫外可见光谱法；配位反应；动力学

Abstract: the complexation between glycine and Cu(Ⅱ) was studied by UV - Vis spectroscopy .The influences of complexation, such as temperature, ionic strength, coordination and pH value were observed. The result shows that: the ionic strength I = 0.1M;the complex rate of glycine and Cu(Ⅱ) (Gly / Cu) is 2:1; pH =7; The rate constant of the complexation was the largest separately, and the temperature will not affect the rate constant obviously. The complexation between glycine and Cu(Ⅱ) was second-order reaction, Activation energy was 7.009KJ/mol ,and free energy △G≠ was 4.321KJ/mol. The possible reaction mechanism for the complexation between glycine and Cu(Ⅱ) was proposed. The theoretical basis was provided for the preparation of high purity copper glycine.

Key words：copper glycine；   UV-Vis spectroscopy ；  complexation ; 
 kinetics
目  录
中文摘要……………………………………………………………………………I
英文摘要……………………………………………………………………………II
目录…………………………………………………………………………………III
1. 绪论………………………………………………………………………………1
 1.1 甘氨酸螯合物的概述…………………………………………………………1
 1.1.1 铜的作用…………………………………………………………………1
 1.1.2 甘氨酸的作用……………………………………………………………2
 1.1.3 甘氨酸铜配合物的分子结构……………………………………………3
 1.2 甘氨酸铜的合成………………………………………………………………3
 1.2.1固相法……………………………………………………………………3
 1.2.2液相法……………………………………………………………………4
 1.3甘氨酸铜的研究进展 …………………………………………………………4
 1.3.1 甘氨酸螯合铜的发展及优势……………………………………………4
 1.3.2 立题意义…………………………………………………………………5
2 实验部分……………………………………………………………………………6
 2.1 试剂与仪器……………………………………………………………………6
 2.1.1 试剂………………………………………………………………………6
 2.1.2 仪器………………………………………………………………………6
 2.2 实验方法………………………………………………………………………6
 2.2.1 缓冲溶液的配置…………………………………………………………6
 2.2.2 贮存溶液的配置…………………………………………………………7
 2.2.3 配合物的吸收光谱………………………………………………………7
 2.2.4 配合物组成的确定………………………………………………………7
 2.2.5甘氨酸和Cu（Ⅱ）配位反应级数的确定 ………………………………8
 2.2.6 温度、离子强度及pH值对甘氨酸与Cu（Ⅱ）配位反应影响…………8
3  结果与结论 ………………………………………………………………………8
 3.1配合物的吸收光谱 ……………………………………………………………8
 3.2 配合物的组成………………………………………………………………10
 3.3甘氨酸与Cu（Ⅱ）配位反应的级数 ………………………………………12
 3.4 温度对甘氨酸与Cu（Ⅱ）配位反应的影响………………………………14
 3.5 离子强度对甘氨酸与Cu（Ⅱ）配位反应的影响…………………………16
 3.6 溶剂pH值对甘氨酸与Cu（Ⅱ）配位反应的影响…………………………17
 3.7 讨论…………………………………………………………………………19
4．总结与展望………………………………………………………………………20
致谢…………………………………………………………………………………22
参考文献……………………………………………………………………………23