Mallétroit Julien, Djian Aurélie, Nakatani Keitaro, Xie Juan, Métivier Rémi, Laurent Guillaume
Photophysique et Photochimie Supramoléculaires et Macromoléculaires, University Paris-Saclay, ENS Paris-Saclay, CNRS, Gif-sur-Yvette, 91190, France.
Phys Chem Chem Phys. 2025 Jan 15;27(3):1320-1326. doi: 10.1039/d4cp02267j.
Donor-acceptor Stenhouse adducts (DASA) are negative photochromic compounds exhibiting a multi-step photoisomerization mechanism. Previous studies have described a first photoactivated step, followed by a thermally controlled one. This study emphasizes the key role of the intermediate species, using high-rate acquisition photokinetic absorption spectroscopy. We have investigated the multi-step processes at different temperatures and irradiation power values. For the first time, we have combined our experimental setup with a three-species photokinetic model to determine the kinetic constants and quantum yields of each step of a DASA compound. Finally, we have identified the key role of the intermediate species, showing that double irradiation experiments allow the tuning of the photochromic reaction.
给体-受体施滕豪斯加合物（DASA）是一类具有多步光异构化机制的负性光致变色化合物。先前的研究描述了一个初始的光活化步骤，随后是一个热控制步骤。本研究利用高速采集光动力学吸收光谱法强调了中间物种的关键作用。我们研究了在不同温度和辐照功率值下的多步过程。首次将我们的实验装置与一个三物种光动力学模型相结合，以确定一种DASA化合物各步骤的动力学常数和量子产率。最后，我们确定了中间物种的关键作用，表明双辐照实验能够调节光致变色反应。
