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This activity focuses on a discussion of the article "Stabilizing Au2+ in a mixed-valence 3D halide perovskite" which was published in 2023 from the Karunadasa group at Stanford University (Lindquist, K.P., Eghdami, A., Deschene, C.R. et al. Stabilizing Au2+ in a mixed-valence 3D halide perovskite. Nat. Chem. 15, 1780–1786 (2023). https://doi.org/10.1038/s41557-023-01305-y)
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| Au2+ Perovskite Questions.docx | 26.62 KB |
After reading this article, students should see how common ideas in coordination chemistry can be applied to the solid state. These ideas include:
1) Periodic trends and the impact of relativistic effects on cation isolability.
2) Coordination geometries and ligand field theory, and their impact in extended solid state structure.
3) An introduction to (potentially) new methods of structural characterization, including Mossbauer and X-ray Absorption spectroscopy
4) The impact of unpaired electrons on atoms, and the resultant magnetic properties of different materials.
5) Intervalence charge transfer, and how ideas of Marcus theory can explain conductivity of materials.
This discussion was created as an end of semester "exam" for students in my "Advanced Inorganic Chemistry" course. For the exam, students were given the article in class to read and answer questions. The class I used this activity in is quite small (~3, so I let them work as a group).
I had spent a decent amount of time discussing relativistic effects at the beginning of the semester (because I think it's cool), and this article was a natural extension of that discussion. I think the more impactful aspects were students using ideas from ligand field theory and coordination chemistry to answer these questions. I am a materials chemist by training, and we actually did not spend very long on ionic structures, but students only needed a brief overview of perovskites to read this article. I believe this is because the ideas in the article are truly presented from a molecular perspective.