Spatial photocontrol of the passive optical output direction of the elastic molecular crystals based on acylhydrazone derivatives
The photo-reactive acylhydrazone derivatives (4-FBAc, 4-ClBAc, 4-BrBAc and 4-IBAc) had been prepared, and they could undergo reversible E-Z isomerization reactions in the crystals under UV (365 nm) irradiation and heating condition. Meanwhile, the significant photomechanical behaviors were observed...
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Veröffentlicht in: | Dyes and pigments 2021-10, Vol.194, p.109529, Article 109529 |
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Sprache: | eng |
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Zusammenfassung: | The photo-reactive acylhydrazone derivatives (4-FBAc, 4-ClBAc, 4-BrBAc and 4-IBAc) had been prepared, and they could undergo reversible E-Z isomerization reactions in the crystals under UV (365 nm) irradiation and heating condition. Meanwhile, the significant photomechanical behaviors were observed for the crystals with different shapes. The crystals of 4-FBAc (block-like), 4-ClBAc (block-like) and 4-BrBAc (rod-like) showed light-induced cracking, salient and cracking behaviors, respectively. Interestingly, the crystals of 4-FBAc (needle-like) and 4-IBAc (needle-like) bent away from the UV light (E→Z isomerization) firstly, then bent toward the source with the increasing of the irradiation or heating time (structure relaxation and Z→E isomerization). The theoretical study also showed that the molecules could undergo reversible E-Z isomerization reactions under UV irradiation and heating condition. Interestingly, the passive optical (635 nm) output direction of the crystal of 4-FBAc could be controlled by UV light. When mechanical force was applied or removed, the needle-like crystals of 4-FBAc and 4-IBAc exhibited reversible elastic bending properties. Analysis of the single crystal data suggested that C–H⋯π and H-bonds were responsible for the flexibility. So, the elastic organic molecular crystals based on acylhydrazone derivatives could be used as the candidate for crystal actuators and position-controllable optical transducer.
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•Upon UV irradiation, the crystals of 4-FBAc, 4-ClBAc, 4-BrBAc and 4-IBAc showed obvious macroscopic movements.•Needle-like crystals of 4-FBAc and 4-IBAc exhibited reversible elastic bending upon applying and releasing of the stress.•The output direction of passive light transmission could be controlled by UV light. |
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ISSN: | 0143-7208 1873-3743 |
DOI: | 10.1016/j.dyepig.2021.109529 |