Photomechanical Luminescence from Through‐Space Conjugated AIEgens

Guo, Jingjing; Fan, Jianzhong; Liu, Xinzhi; Zhao, Zujin; Tang, Ben Zhong

doi:10.1002/ange.201913383

Cited by 12 publications

(5 citation statements)

References 57 publications

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“…Optical spectroscopy (absorption and fluorescence) has been widely used to monitor different chemical species present during the reaction. Photodimerization reactions in particular are easy to monitor using this method because the loss of conjugation leads to large absorption shifts and fluorescence changes after irradiation [19,57,58] . Other spectroscopies that are sensitive to the chemical environment can provide more detailed information.…”

Section: Discussionmentioning

confidence: 99%

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Cooperative Photochemical Reaction Kinetics in Organic Molecular Crystals

Morimoto

Kitagawa

Bardeen

et al. 2023

Chemistry A European J

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Photoreactive molecular crystals have been intensively investigated as next-generation functional materials. Changes in physicochemical properties are usually interpreted in terms of static pre-and post-reaction molecular structures and packings determined by X-ray structure analysis. However, to elucidate the dynamic properties, it is necessary to understand the dynamic nature of photochemical kinetics in crystals. Reaction dynamics in the crystal phase can be dramatically different from those in dilute solution because the local molecular environment evolves as the surrounding reactant molecules are transformed into products. In this Review article, we summarize multiple examples of photochemical reactions in the crystalline phase that do not follow classical kinetic behavior. We also discuss different theoretical methods that can be used to describe this behavior. This Review article should help provide a foundation for future workers to understand and analyze photochemical reaction kinetics in crystals.

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Section: Discussionmentioning

confidence: 99%

“…It has been reported that physicochemical properties such as luminescence [57,58] and crystal shape [4,66] change as a result of photoreactions in the crystal. Because of these property changes, crystals are expected to be applied to optical sensors and photomechanical actuators.…”

Section: Discussionmentioning

confidence: 99%

Cooperative Photochemical Reaction Kinetics in Organic Molecular Crystals

Morimoto

Kitagawa

Bardeen

et al. 2023

Chemistry A European J

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“…When the crystals were full of cracks, the movement gradually slowed until stop (video S1 and Figure 3, 10-30 s). In our previous work, photosalient Br-or Isubstituted chalcones were synthesized and the motion behavior was proved to result from photo-induced [2 + 2] cycloaddition reaction [24,25], and there exist some other reports also greatly supporting this motion mechanism [26][27][28][29][30]. To verify this, crystal 1 were irradiated by UV light over 3 days and characterized by nuclear magnetic resonance (NMR) spectroscopy (Supplementary Figure S3).…”

mentioning

confidence: 88%

CHCl3-Dependent Emission Color and Jumping Behavior of Cyclic Chalcone Single Crystals: The Halogen Bond Network Effect

et al. 2021

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As a conventional strategy to modulate the structure and properties of inorganic single crystals, hydration/solvation is rarely found to function in pure organic single crystal. Herein, we report chalcone single crystals with CHCl3-dependent emission color and jumping behavior. Two crystals: a pure crystal phase (1) with green-yellow emission and a CHCl3-containing co-crystal phase (1•2CHCl3) with orange-red emission were constructed by fine-controlling the crystallization conditions. The special halogen bond network in the crystal packing structure effectively narrows the bandgap and thereby redshift the emission of 1•2CHCl3. 1•2CHCl3 would revert to 1 together with emission color change when losing CHCl3. These findings are similar to the effect of H2O in hydrated inorganic crystals. Notably, owing to a special pre-organized “molecular pair” structure for [2 + 2] cycloaddition, the pure crystal phase 1 exhibits violently photo-induced jumping phenomenon, indicating large potentials in intelligent devices. This work would overturn the previous perception that the structurally simple solvent molecules without conjugation cannot greatly affect the structure and properties of pure organic single crystals and provide a new strategy to construct multi-colored organic fluorescent crystals.

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“…Smart‐responsive materials whose properties, such as electrochemical potential, [1] absorption, [2] luminescence, [3] electroconductivity, [4] spin state [5] can be modulated tractably by external stimuli, e.g., temperature, pressure, optical radiation, and magnetic/electric fields [6–9] . Light is recognized as an ideal external stimulus source as its superiority of contactless remote control for manipulating materials′ properties [10, 11] .…”

Section: Introductionmentioning

confidence: 99%

Photo‐controllable Luminescence from Radicals Leading to Ratiometric Emission Switching via Dynamic Intermolecular Coupling

et al. 2023

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The development of photoinduced luminescent radicals with dynamic emission color is still challenging. Herein we report a novel molecular radical system (TBIQ) that shows photo-controllable luminescence, leading to a wide range of ratiometric color changes via light excitation. The conjugated skeleton of TBIQ is decorated with steric-demanding tertiary butyl groups that enable appropriate intermolecular interaction to make dynamic intermolecular coupling possible for controllable behaviors. We reveal that the helicenic pseudo-planar conformation of TBIQ experiences a planarization process after light excitation, leading to more compactly stacked supermolecules and thus generating radicals via intermolecular charge transfer. The photo-controllable luminescent radical system is employed for a highlevel information encryption application. This study may offer unique insight into molecular dynamic motion for optical manufacturing and broaden the scope of smart-responsive materials for advanced applications.

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Photomechanical Luminescence from Through‐Space Conjugated AIEgens

Abstract: Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Cited by 12 publications

References 57 publications

Cooperative Photochemical Reaction Kinetics in Organic Molecular Crystals

Cooperative Photochemical Reaction Kinetics in Organic Molecular Crystals

CHCl3-Dependent Emission Color and Jumping Behavior of Cyclic Chalcone Single Crystals: The Halogen Bond Network Effect

Photo‐controllable Luminescence from Radicals Leading to Ratiometric Emission Switching via Dynamic Intermolecular Coupling

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