University Chemistry ›› 2021, Vol. 36 ›› Issue (3): 2006069.doi: 10.3866/PKU.DXHX202006069

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Laboratory Teaching Results and Discussions of "Preparation and Spectral Identification of trans/cis-[Co(en)2Cl2]Cl": One of the Typical Examples for Cultivating Students' Critical Thinking

Xiaoqing Ouyang, Chunyan Zhang, Rui Pan, Chanzi Ruan, Yinyun Lü, Yuhua Weng, Zhiqiang Dong, Shunü Peng, Huamin Li, Zhenling Xu, Yanping Ren()   

  • Received:2020-06-24 Accepted:2020-08-07 Published:2020-09-28
  • Contact: Yanping Ren


This article mainly introduces the laboratory teaching results and discussions of "preparation and spectral identification of trans/cis-[Co(en)2Cl2]Cl", which is specially designed for the top talented chemistry-majored students in Xiamen University. Focusing on the two synthetic targets of "quality" and "quantity", i.e., how to get "pure" and "multiple" trans/cis-[Co(en)2Cl2]Cl complexes, the synthesis process and conditions were analyzed, reflected, and judged by questions and discussions based on the detailed and intuitive preparation process and UV-Visible absorption spectrum. Through this practice, we want to show how to effectively cultivate students' critical thinking in the laboratory teaching process.

Key words: trans/cis-[Co(en)2Cl2]Cl, Preparation and identification, Analysis and discussion of experimental results, Flipped Class, Critical thinking