邻二氮菲合铁(Ⅱ)组成及稳定常数测定实验的改进与优化

doi:10.3866/PKU.DXHX202110066

大学化学 >> 2022, Vol. 37 >> Issue (7): 2110066.doi: 10.3866/PKU.DXHX202110066

邻二氮菲合铁(Ⅱ)组成及稳定常数测定实验的改进与优化

张斌(), 刘爽, 朱艳艳, 张家源, 伍敏, 刘春梅

郑州大学化学学院, 郑州 450001

收稿日期:2021-10-22 录用日期:2021-11-22 发布日期:2021-12-16
通讯作者: 张斌 E-mail:bz@zzu.edu.cn
作者简介:张斌, Email: bz@zzu.edu.cn
基金资助:
国家级大学生创新创业训练计划项目(202110459093);国家留学基金委资助项目(202007045014)

Improvement and Optimization of Stoichiometric Ratio and Stability Constant Determination of Fe(phen)₃²⁺ Complex

Bin Zhang(), Shuang Liu, Yanyan Zhu, Jiayuan Zhang, Min Wu, Chunmei Liu

College of Chemistry, Zhengzhou University, Zhengzhou 450001, China

Received:2021-10-22 Accepted:2021-11-22 Published:2021-12-16
Contact: Bin Zhang E-mail:bz@zzu.edu.cn

摘要/Abstract

摘要：

“分光光度法测定邻二氮菲合铁(Ⅱ)组成及稳定常数”是化学类及相关专业广泛开设的经典实验。随着各高校实验条件的完善和进步，有必要对此实验进行系统化设计，以适应对学生培养质量的进一步提升要求。本文中，利用紫外-可见分光光度计测试配合物的紫外-可见吸收曲线，确定检测波长；结合配合物的前线轨道对配位显色机理进行解释。利用Origin软件对实验数据进行分析，得到准确、可靠的实验结果。通过内容的改进与扩充，本实验有助于提高教学训练的系统性与综合性，实现对学生科学思维能力的培养。

关键词: 紫外-可见分光光度计, 邻二氮菲合铁(Ⅱ), 等摩尔连续变化法, 配合物组成, 稳定常数

Abstract:

Determination of the stoichiometric ratio and stability constants of iron(Ⅱ)-(1, 10-phenanthroline) complex via UV-Visible spectrophotometry is an important experiment in chemistry and related fields. Because laboratory conditions have been significant improved in recent times, the experimental procedure was optimized systematically in this study. The UV-Visible absorption spectra of the Fe(phen)₃²⁺ complex together with the free ligand were measured to determine the wavelength (λ) for the continuous variation methods. Meanwhile, frontier molecular orbital analysis of the complex provides clear visual evidence that the long-wavelength absorption band corresponds mainly to the metal-to-ligand charge transfer (MLCT) transition. Additionally, the experiments could achieve reliable and unbiased results for the composition and stability constants by analyzing experimental data using the Origin software. It is expected that these improvements and optimizations in the stoichiometric and stability constant determination experiments could help students become acquainted with the scientific experimental method, which is a critical requisite for student learning and development.

Key words: UV-Vis spectrophotometer, Tris(1, 10-phenanthroline)iron(Ⅱ), Method of continuous variation, Stoichiometric ratio of complex, Stability constant

张斌, 刘爽, 朱艳艳, 张家源, 伍敏, 刘春梅. 邻二氮菲合铁(Ⅱ)组成及稳定常数测定实验的改进与优化[J]. 大学化学, 2022, 37(7): 2110066.

Bin Zhang, Shuang Liu, Yanyan Zhu, Jiayuan Zhang, Min Wu, Chunmei Liu. Improvement and Optimization of Stoichiometric Ratio and Stability Constant Determination of Fe(phen)₃²⁺ Complex[J]. University Chemistry, 2022, 37(7): 2110066.

链接本文: https://www.dxhx.pku.edu.cn/CN/10.3866/PKU.DXHX202110066

https://www.dxhx.pku.edu.cn/CN/Y2022/V37/I7/2110066

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键	晶体值	计算值
Fe-N(1)	1.984(6)	2.0269
Fe-N(2)	1.974(6)	2.0280
Fe-N(3)	1.983(6)	2.0280
Fe-N(4)	1.967(5)	2.0269
Fe-N(5)	1.981(6)	2.0268
Fe-N(6)	1.971(6)	2.0272

编号	V(HAc–NaAc)/mL	V(Fe²⁺)/mL	V(Phen)/mL	χ^a	A
1#	10.00	0.00	10.00	0.00	0.000
2#	10.00	0.50	9.50	0.050	0.103
3#	10.00	1.00	9.00	0.100	0.229
4#	10.00	1.50	8.50	0.150	0.330
5#	10.00	2.00	8.00	0.200	0.449
6#	10.00	2.50	7.50	0.250	0.550
7#	10.00	3.00	7.00	0.300	0.520
8#	10.00	4.00	6.00	0.400	0.449
9#	10.00	5.00	5.00	0.500	0.375
10#	10.00	6.00	4.00	0.600	0.295
11#	10.00	7.00	3.00	0.700	0.212
12#	10.00	8.00	2.00	0.800	0.140
13#	10.00	9.00	1.00	0.900	0.081
14#	10.00	10.00	0.00	1.00	-0.005

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邻二氮菲合铁(Ⅱ)组成及稳定常数测定实验的改进与优化

Improvement and Optimization of Stoichiometric Ratio and Stability Constant Determination of Fe(phen)₃²⁺ Complex

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邻二氮菲合铁(Ⅱ)组成及稳定常数测定实验的改进与优化

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Improvement and Optimization of Stoichiometric Ratio and Stability Constant Determination of Fe(phen)₃²⁺ Complex