Tuned Intra- and Intermolecular Photoreactions of Tridentate Cyanostilbenes with Distinct Aggregated-State Photomechanical and Dispersed-State Photochromic Behaviors

Yanglan Ding; Jing Guo; Xuan HeWei TaoYadong ShiJiahui XuLei XuMingxing TangDengke ShenHong BiZong-Quan WuKun YangZebing ZengPeifa Wei

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Tuned Intra- and Intermolecular Photoreactions of Tridentate Cyanostilbenes with Distinct Aggregated-State Photomechanical and Dispersed-State Photochromic Behaviors

机译：Tuned Intra- and Intermolecular Photoreactions of Tridentate Cyanostilbenes with Distinct Aggregated-State Photomechanical and Dispersed-State Photochromic Behaviors

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摘要

Developing a new strategy to realize on-demand photoreactions with distinguishablesignals is highly desirable. Herein, by simply tuning the molecularstate, tuned photoreactions with different dynamic signals based on a seriesof tridentate cyanostilbene molecules (TCS1-5) are realized. The results showthat in the crystalline state, the ordered and densely molecular packingfacilitates the successive intermolecular photocycloaddition between adjacentcyanostilbene molecules and causes accumulated stresses within thecrystals, which further induces variable photo-induced mechanical motionssuch as peeling, bending, twisting, and so on. In the monodispersed solutionstate, however, the larger distances between TCS1-5 molecules afforda photo-induced radical-assisted intramolecular photocyclization processand give rise to multiple domino photochromic and photofluorochromicbehaviors. Based on their distinct yet controllable thermostability and radicalcolors, photochromic films are fabricated from TCS1@PMMA and TCS1/TFA@PMMA for Morse code and rewritable photopatterning applications,showing excellent photochromism. By coating TCS3 on a piece of plastic bag,the macroscopic mechanical motion is achieved by amplifying the collectivemolecular motion from the nanoscale up to the macroscopic dimension. Themolecular state-based strategy reveals the regularity between photoreactionsand molecular packing and further provides an opportunity to rapidly accesscontrollable photoresponsive systems.

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来源
《Advanced functional materials》 |2023年第23期|2212886.1-2212886.11|共11页
作者
Yanglan Ding; Jing Guo; Xuan HeWei TaoYadong ShiJiahui XuLei XuMingxing TangDengke ShenHong BiZong-Quan WuKun YangZebing ZengPeifa Wei;
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Institutes of Physical Science and Information TechnologyKey Laboratory of Structure and Functional Regulation of HybridMaterials of Ministry of EducationAnhui Graphene Engineering LaboratoryAnhui UniversityHefei 230601, P. R. China;

Shenzhen Research Institute of Hunan UniversityShenzhen 518000, P. R. China State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082, P. R. China;

School of Materials Science and EngineeringAnhui UniversityHefei 230601, P. R. ChinaDepartment of Polymer Science and EngineeringSchool of Chemistry and Chemical Engineering, and Anhui KeyLaboratory of Advanced Catalytic Materials and Reaction EngineeringHefei University of TechnologyHefei 230009, P. R. ChinaShenzhen Research Institute of Hunan UniversityShenzhen 518000, P. R. China;

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cyanostilbenes; molecular states; photochromisms; photoreactions; photosalience;

Tuned Intra- and Intermolecular Photoreactions of Tridentate Cyanostilbenes with Distinct Aggregated-State Photomechanical and Dispersed-State Photochromic Behaviors

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