Photo-responsive Hydrogen-Bonded Molecular Networks Capable of Retaining Crystalline Periodicity after Isomerization

This study describes a photo-responsive single crystal based on hydrogen-bonded (H-bonded) network of dihydrodimethylbenzo[e]pyrene derivative 4BDHP. A crystal composed of H-bonded undulate layers, 4BDHP-2, underwent photoisomerization in the crystalline state due to loose stacking of the layers, resulting loss of crystallinity. Enantio-pure crystal (S,S)-4BDHP-2, on the other hand, allowed to reveal the structure of the photoisomerized crystal, in which the closed form (4BDHP) and open form (4CPD) were arranged alternately with keeping crystalline periodicity, although side reactions were also implied. The present proof-of-concept system of a photochromic framework that retains crystalline periodicity after photoisomerization may provide new light-driven porous functional materials.PMID:38577718 | DOI:10.1002/anie.202404700

Source: Angewandte Chemie - April 5, 2024 Category: Chemistry Authors: Koki Kasuya Ryusei Oketani Souta Matsuda Hiroyasu Sato Fumitaka Ishiwari Akinori Saeki Ichiro Hisaki Source Type: research