甘氨酸与亚铁离子配位反应的动力学研究

文档编号:ZY056    文档字数:9998,页数:28

 摘要：本文档用紫外-可见光谱法研究甘氨酸与亚铁离子配位反应．考察了温度、离子强度、配位比及pH值等因素对配位反应的影响。结果表明：当I=0.02；甘氨酸与亚铁离子的配位比为4：1；pH=5.0时，甘氨酸亚铁有最大的反应速率。在此条件，根据Arrhenius方程和Absolute-rate theory方程求得其活化能为4291.35J/mol，自由能△G≠为1786.60J/mol。而温度对配位反应的影响表现不是很突出。在甘氨酸与亚铁离子分别大量过量的条件下得出配位反应是二级反应。最后本文提出了可能的配位反应机理，为制备高纯甘氨酸亚铁提供理论依据。
关键词：甘氨酸亚铁 配位反应 紫外可见光谱法  动力学

Abstract: In this dissertation，the complexation between glycine and ferrous ions 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 = 0.02;the complex rate of glycine and ferrous ions (Gly / Fe) is 4:1; pH = 5.0，the rate constant of the complexation had the largest separately．It wsa accounted that the Activation energy Ea was 4291.35J/mol by the equation of Arrhenius, and free energy △G≠ was 1786.60J/mol by the equation of Absolute-rate theory，and the temperature was not affect the the formation rate obviously. the complexation between glycine and ferrous ions was second-order reaction when glycine excess and ferrous ions excess. In the end，The theoretical basis was provided for the preparation of high purity ferrous glycine.

Key words: iron(Ⅱ)-glycine  UV-visible spectroscopy  Coordination reaction dynamics
目  录
中文摘要 I
英文摘要 II
目录 III
1. 绪论 1
 1.1 引言 2
 1.2 甘氨酸亚铁配合物的分子结构 4 
 1.3 甘氨酸的制备方法 4
2. 实验部分 6
 2.1 实验仪器和材料 6
 2.2 实验装置和实验方程 6
 2.3 典型的实验过程  8
3. 结果与讨论 8
 3.1 配合物的吸收光谱  8
 3.2 配合物的组成 9
 3.3 甘氨酸与亚铁离子配位反应的级数  11
 3.4 温度对甘氨酸与亚铁离子配位反应的影响 13
 3.5 离子强度对甘氨酸与亚铁离子配位反应的影响  15
 3.6 pH值对甘氨酸与亚铁离子配位反应的影响   17
 3.7 讨论  19
4．小结 20
5．总结与展望 21
致谢 22
参考文献 23

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