非常规价态锰元素化合物的研究
西南大学, 教师教育学院, 重庆 400700
| 摘 要： | 锰是一种重要的金属元素，广泛应用于工业、医药等各个领域，然而中学教材中缺乏对锰及其化合物系统的介绍。为制备几种非常规价态锰元素化合物锰化合物，阐明锰元素各氧化态间的内在联系，帮助学生认识锰元素的各种氧化态。本研究设计了三组有关锰元素不同价态间相互转化的实验，涉及氧化还原反应、可逆反应以及配位化合物等相关知识，并通过紫外—可见分光光度计分析产物。结果表明，锰酸钾（VI）与二氧化锰在强碱性条件下制得不稳定的蓝色锰酸钾（V）；高锰酸钾与浓硫酸在不同条件下分别制得不稳定的红色三氧化锰以及在强酸性环境中相对稳定的三价锰离子，且发生丰富的颜色变化。这可以为学生感受锰元素各种氧化态的转化过程提供实验证据，也能有效激发学生的学习兴趣。 |
| 关 键 词： | 锰酸钾（V）; 三氧化锰; 三价锰离子; 配合物; 归中反应; 歧化反应 |
| DOI： | 10.57237/j.edu.2022.01.011 |
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收稿日期: 2022-09-29
接受日期: 2022-11-09
在线出版日期: 2022-11-23
Study of Unconventional Valence Compounds of Manganese Elements
College of Teacher Education, Southwest University, Chongqing 400700, China
| Abstract: | Manganese is an important metal element and is widely used in various fields such as industry and medicine. However, there is a lack of systematic introduction of manganese and its compounds in secondary school textbooks The purpose of the experiment is to prepare several unconventional valence compounds of manganese elements, to clarify the intrinsic connection between the oxidation states of manganese, and to help students recognize the various oxidation states of manganese. In this study, three sets of experiments on the interconversion of different valence states of manganese elements were designed, involving the knowledge of redox reactions, reversible reactions and coordination compounds, and the products were analyzed by UV-Vis spectrophotometer. The results showed that the unstable blue potassium manganate (V) was prepared from potassium manganate (VI) and manganese dioxide under strong alkaline conditions. Potassium permanganate and concentrated sulfuric acid under different conditions produced relatively stable red manganese trioxide and trivalent manganese ions, respectively, with rich color changes. This can provide experimental evidence for students to feel the transformation process of various oxidation states of manganese element, and also can effectively stimulate students' interest in learning. |
| Keywords: | Potassium Manganite (V); Threemanganese Trioxide; Trivalent Manganese Ion; Coordination Compounds; Comproportionation Disproportionation Reaction |
基金
| 1. | 2021重庆市高等教育教学改革研究项目 (212024) |
| 2. | 2021年重庆市儿童发展与教师教育研究中心重点项目 (JSJY2104) |
| 3. | 中国教育学会2021年度教育科研规划项目 (202100170809B) |
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