University Chemistry ›› 2022, Vol. 37 ›› Issue (5): 2109089.doi: 10.3866/PKU.DXHX202109089

Special Issue: 第2届全国大学生化学实验创新设计竞赛

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A Comprehensive Experiment of Synthesis and Photochromic Characterization of Rhodamine 6G Hydrazide Salicylaldehyde Schiff Base Zinc Ion Complex

Yuanyuan Li1,*(), Yang Ding1, Tingting Zhang1, Wenting Li1, Kai Li2,*()   

  1. 1 School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, China
    2 College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
  • Received:2021-09-24 Accepted:2021-10-29 Published:2022-03-08
  • Contact: Yuanyuan Li,Kai Li;


A 6-class comprehensive chemistry experiment was designed to introduce the research hotspot of photochromism, aiming to impart the organic synthesis, spectral analysis, and other related knowledge to students. In this experiment, the rhodamine 6G hydrazide salicylaldehyde Schiff base was synthesized through two steps. This molecule was then combined with zinc ion to obtain the rhodamine 6G hydrazide salicylaldehyde Schiff base zinc ion complex, which exhibits photochromic property. Students can learn about photochromic phenomena by observing the color and UV spectrum changes in the complex before and after UV light irradiation, both in solution and in solid substrates. This, combined with classroom instructions and literature reading, allows students to understand the mechanism of photochromism. The reagents and instruments required for this experiment are simple and cost-effective, which makes the experiment suitable for undergraduate chemistry experiments or other related majors. In addition, these experimental phenomena are notable and interesting. Through this experiment, students can not only improve their knowledge and professional qualities but also cultivate their interest and love for chemistry.

Key words: Photochromism, Rhodamine 6G, Complex


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