Exploring the pH dependent aqueous speciation of metal complexes through UV-Vis spectroscopy.
Exploring the pH dependent aqueous speciation of metal complexes through UV-Vis spectroscopy.
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通过紫外-可见光谱探索金属配合物的 pH 依赖性水相形态。
DOI：
10.1021/acs.jchemed.9b01199
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发表时间：
2020
影响因子：
3
通讯作者：
Tinoco,ArthurD
中科院分区：
文献类型：
--
作者：
Gaur,Kavita;Cruz,YahairaM;SantiagoEspinoza,JoséA;MoralesRueda,CarlosA;Loza-Rosas,SergioA;Fernández-Vega,LaurenV;Benjamín-Rivera,JosuéA;Álvarez,Adelis;Tinoco,ArthurD
配位化学是本科无机化学课程的主要组成部分，然而，由于通常在一个学期内教授的课程的限制，材料的演示可能很麻烦。此外，由于化学的这个分支涵盖了所有的元素，课程设计还没有标准化。这些因素导致一些重要的配位化学主题没有得到充分的发展。在此，我们提出了一个新的活动，正式介绍金属络合物水形态的整体主动学习的方式，包括讲座组件和动手经验。这个主题与现实世界相关，并将许多重要的协调概念置于背景中。它将扩大学生的理解，通过关注pH值的影响，影响金属络合在水溶液环境中的复杂因素。活动探讨了Fe（III）和2，3-二羟基萘-6-磺酸盐之间的良好特征的相互作用的pH值依赖的形态，并揭示了整个pH值范围0-13的物种的丰富多彩的变化。学生将学习如何生成物种形成图，并了解过渡金属化合物的紫外-可见（UV-Vis）电子吸收光谱，以便能够分析他们观察到的颜色来源。活动的评估进行了24名学生谁完成了李克特量表调查，并回答了开放式问题。然后将该活动应用于实际课程设置中，对学生的理解进行定量评估。这项活动可以很容易地适应从小学到大学的不同学术发展阶段的学生。
Coordination chemistry is a major component of the undergraduate inorganic chemistry curriculum, and yet, the presentation of the material can be cumbersome due to the limitations of the course typically being taught in one semester. Also, because of the large scope of this branch of chemistry encompassing all of the elements, the course design has not been standardized. These factors result in some important coordination chemistry themes being given insufficient development. Herein, we propose a novel activity to formally introduce metal complex aqueous speciation in a holistic active-learning manner that includes a lecture component and a hands-on experience. This topic has real-world relevance and contextualizes many important coordination concepts. It would extend student comprehension about the intricate factors that affect metal complexation in an aqueous solution environment by focusing on the influence of pH. The activity explores the pH dependent speciation of the well-characterized interaction between Fe(III) and 2,3-dihydroxynapthalene-6-sulfonate and reveals the colorful changes in species throughout the pH range 0–13. Students learn how to generate speciation plots and to understand the ultraviolet–visible (UV–Vis) electronic absorption spectroscopy of transition metal compounds to be able to analyze the source of color that they observe. Assessment of the activity was conducted with 24 students who completed a Likert scale survey and responded to open-ended questions. The activity was then applied in actual course settings in which student comprehension was quantitatively evaluated. The activity can be easily adapted to students of different stages of academic development from elementary to college students.