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Updated: Dec 8, 2025

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
Published on: May 29, 2018
Colorimetric probing of in both solution and thin film
1Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, Technical Institute of Physics and Chemistry, The Chinese Academy of Science, Beijing, 100190, China. yichencas@yahoo.com.cn.
Abstract:
A reagent for colorimetric detection of Hg2+ in both solution and PMMA thin film has been investigated. It is found that 7-hydroxy-spiro-(2H-1-benzopyran-2,2'-indoline) shows highly selective colorimetric probing for Hg2+ in both solution and PMMA thin film. Addition of Hg2+ to the solution of reagent or dipping the reagent thin film into the solution of Hg2+ produces a distinct color change from colorless to red. Control experiments show that the colorimetric detection of Hg2+ is not affected by other competitive metal ions.
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