In situ observation of a stepwise [2 + 2] photocycloaddition process using fluorescence spectroscopy

Meng-Fan Wang, Yun-Hu Deng, Yu-Xuan Hong, Jia-Hui Gu, Yong-Yong Cao, Qi Liu (), Pierre Braunstein and Jian-Ping Lang ()
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Meng-Fan Wang: Soochow University
Yun-Hu Deng: Soochow University
Yu-Xuan Hong: Soochow University
Jia-Hui Gu: Soochow University
Yong-Yong Cao: Jiaxing University
Qi Liu: Soochow University
Pierre Braunstein: Université de Strasbourg, 4 rue Blaise Pascal - CS 90032
Jian-Ping Lang: Soochow University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Using highly sensitive and selective in situ techniques to investigate the dynamics of intermediates formation is key to better understand reaction mechanisms. However, investigating the early stages of solid-state reactions/transformations is still challenging. Here we introduce in situ fluorescence spectroscopy to observe the evolution of intermediates during a two-step [2 + 2] photocycloaddition process in a coordination polymer platform. The structural changes and kinetics of each step under ultraviolet light irradiation versus time are accompanied by the gradual increase-decrease of intensity and blue-shift of the fluorescence spectra from the crystals. Monitoring the fluorescence behavior using a laser scanning confocal microscope can directly visualize the inhomogeneity of the photocycloaddition reaction in a single crystal. Theoretical calculations allow us to rationalize the fluorescence behavior of these compounds. We provide a convenient strategy for visualizing the solid-state photocycloaddition dynamics using fluorescence spectroscopy and open an avenue for kinetic studies of a variety of fast reactions.

Date: 2023
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DOI: 10.1038/s41467-023-42604-9

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