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Hemipiperazines are an emerging class of robust molecular photoswitches based on a 2,5-diketopiperazine scaffold. We resolve the excited-state pathway responsible for efficient photoisomerisation of a model hydrogen-bonded hemipiperazine photoswitch using ultrafast time-resolved infrared spectroscopy and temperature-dependent fluorescence measurements.
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Ashworth et al. (2026) studied this question.
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