紫外可见光谱法研究甘氨酸与亚铁离子配位现象

论文编号:ZY049    论文字数:11825,页数:30

摘 要：本论文用紫外-可见光谱法研究甘氨酸与亚铁离子的配位反应。考察了温度、离子强度、配位比及pH值等对配位反应的影响。结果表明：当离子强度为I=0.02；甘氨酸与亚铁离子配位比（Gly／Fe）为4：1；pH=5.0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。甘氨酸与亚铁离子的配位反应为二级反应，反应活化能为4.488KJ/mol，自由能△G≠为2.012KJ/mol。同时本文提出了甘氨酸与亚铁离子配位反应的合理机理，为高纯甘氨酸亚铁的制备提供理论依据。

关键词：甘氨酸亚铁；紫外可见光谱法；配位反应；动力学

Abstract:In this paper, 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; formation rate of the complexation was the largest separately, and the temperature will not affect the the formation rate obviously. The complexation between glycine and ferrous ions was second-order reaction, Activation energy was 4.488KJ/mol ,and free energy △G≠ was 2.012KJ/mol. The possible reaction mechanism for the complexation between glycine and Fe(Ⅱ) was proposed. The theoretical basis was provided for the preparation of high purity ferrous glycine.

Key words：ferrous glycine；   UV-Vis spectroscopy ；  complexation ;  dynamaics

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
 1.2甘氨酸亚铁的合成………………………………………………………………2
1.3 甘氨酸亚铁的研究进展…………………………………………………………5
2 实验部分………………………………………………………………………………8
 2.1 试剂与仪器………………………………………………………………………8
 2.2 实验方法…………………………………………………………………………8 
 
3  结果与结论………………………………………………………………………10
 3.1配合物的吸收光谱……………………………………………………………10
 3.2 配合物的组成…………………………………………………………………11
 3.3甘氨酸与亚铁离子配位反应的级数…………………………………………13
 3.4 温度对甘氨酸与亚铁离子配位反应的影响…………………………………15
 3.5 离子强度对甘氨酸与亚铁离子配位反应的影响……………………………17
 3.6 溶剂PH对甘氨酸与亚铁离子配位反应的影响………………………………19
 3.7 讨论……………………………………………………………………………21
4．总结与展望…………………………………………………………………………22
致谢……………………………………………………………………………………24
参考文献………………………………………………………………………………25