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A unimolecular platform based on diarylethene with multiple stimuli-gated photochromism
摘要： The gated photochromic systems have attracted great interest in scientific researches due to their merits in the opto-electronic fields, whereas the multi-stimuli gating function in a unimolecular platform has rarely been addressed. Herein, a new strategy to realize multi-stimuli gated photochromic function was devised relying on a simple Schiff-based diarylethene derivative. The compound shows no photoswitching properties in solution under irradiation with any wavelength of light. It is noteworthy that mecury(II) ions, water and protons can trigger its photo-reactivity independently with different absorption changes, respectively. Therefore, a molecular logic circuit with four inputs, including mecury(II) ions, water, protons and UV light, was fabricated on the basis of the unimolecular platform, suggesting promise for application in multi-controlled photoswitchings. These results could be valuable for the further development of photoswitchings with multiple stimuli responses.
关键词： Diarylethenes,photoswitching,molecular logic circuit,multiple stimuli responses,gated photochromism
更新于2025-09-23 15:23:52
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A photochromic benzothiadiazole-diarylethene with tuneable on-off fluorescence modulation
摘要： Organic molecules with photoswitchable emission properties are of interest in the optical devices field. We present herein in-solution studies for two dimethoxy-DTE-fluorophore-conjugates with carboxylic acid anchor group attachable to semiconductor surfaces (DTE-BODIPY and BTD-DTE). Both conjugates show almost quantitative reversible photoisomerization between open (OF) and closed form (CF). With excitation of the fluorophores, both conjugates emit fluorescence with highly solvent dependent OFs (BTD-DTE > DTE-BODIPY) and minor solvent dependent CFs. In the polar solvent MeCN for BTD-DTE a TICT state is clearly observed, which will be located in the twisted conjugated structure of the benzoic acid-BTD-fluorophore-methoxy thiophene unit. BTD-DTE shows positive solvatofluorochromism with decrease of fluorescence quantum yields by increasing Δf verified in Lippert-Mataga plots. This leads to solvent dependent on-off/off-on (CF-OF) emission modulation by FRET with well-separated emission bands for BTD-DTE.
关键词： Diarylethenes,Photochromism,Solvatochromism,Fluorescence,Energy transfer
更新于2025-09-23 15:22:29
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Oxidative and reductive cyclization in stiff dithienylethenes
摘要： The electrochemical behavior of stiff dithienylethenes, undergoing double bond isomerization in addition to ring-closure, has been investigated. Electrochromism was observed in almost all cases, with the major pathway being the oxidatively induced cyclization of the open isomers. The influence of the ring size (to lock the reactive antiparallel conformation) as well as substituents (to modulate the redox potential) on the electrocyclization was examined. In the series of derivatives with 6-membered rings, both the E- and the Z-isomer convert to the closed isomer, whereas for the 7-membered rings no cyclization from the E-isomer was observed. For both stiff and normal dithienylethenes bearing benzonitrile substituents an additional and rare reductive electrocyclization was observed. The mechanism underlying both observed electrocyclization pathways has been elucidated.
关键词： (spectro)electrochemistry,electrochromism,molecular switches,diarylethenes
更新于2025-09-23 15:22:29
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Photoinduced Modulation of the Emission from СdSe/ZnS Quantum Dots by Photochromic Transformations of Diarylethenes
摘要： A spectral study of the interaction between the molecules of photochromic compounds of the diarylethene class and CdSe/ZnS quantum dots (QDs), in dependence of the structure and nature of functional substituents of photochromes, has been performed. It is shown that both chemical and physical interactions are accompanied by photoinduced modulation of QD emission as a result of photochromic transformations of diarylethenes caused by the inductive transfer of excitation energy from QDs to the diarylethene cyclic isomer.
关键词： diarylethenes,CdSe/ZnS quantum dots,nanomaterials,photoinduced modulation,photochromic transformations,ceramics
更新于2025-09-12 10:27:22
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Photoinduced Reversible Modulation of Fluorescence of CdSe/ZnS Quantum Dots in Solutions with Diarylethenes
摘要： Steady-state absorption and fluorescence spectra, fluorescence decay kinetics of CdSe/ZnS quantum dots (QD) with photochromic diarylethenes (DAE) in toluene have been studied. Two kinds of QDs emitting at 525 and 600 nm were investigated and DAE were selected to ensure good overlap of their photoinduced absorption band with QDs emission spectra. It has been found that photochromic molecules form complexes with QD which results in partial fluorescence quenching. A reversible modulation of QDs emission intensity which correlates with magnitude of transient photoinduced absorption band of the diarylethenes during photochromic transformations has been demonstrated.
关键词： Photochromism,Nanophotoswitches,Quantum dots,Diarylethenes
更新于2025-09-12 10:27:22
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Holography with Photochromic Diarylethenes
摘要： Photochromic materials are attractive for the development of holograms for different reasons: they show a modulation of the complex refractive index, meaning they are suitable for both amplitude and phase holograms; they are self-developing materials, which do not require any chemical process after the light exposure to obtain the final hologram; the holograms are rewritable, making the system a convenient reconfigurable platform for these types of diffractive elements. In this paper, we will show the features of photochromic materials, in particular diarylethenes in terms of the modulation of a transparency and refractive index, which are mandatory for their use in holography. Moreover, we report on the strategies used to write binary and grayscale holograms and their achieved results. The outcomes are general, and they can be further applied to other classes of photochromic materials in order to optimize the system for achieving high efficiency and high fidelity holograms.
关键词： holography,refractive index,diarylethenes,photochromism,CGH
更新于2025-09-11 14:15:04
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External Reversal of Chirality Transfer in Photoswitches
摘要： The transfer of stereoinformation is at the heart of asymmetric reactions. By incorporating the natural monoterpene L-menthone into the backbone of a diarylethene, we could achieve efficient chirality transfer upon photocyclization resulting in the preferred formation of one major closed isomer in a diastereomeric ratio (dr) of 85 : 15. More significantly, we were able to completely reverse the diastereomeric outcome of the ring-closure, simply by altering the chemical environment or the irradiation conditions. As a result, we could selectively accumulate the less favored minor closed isomer, with remarkable dr values of > 99 : 1 and 74 : 26, respectively. Computations reveal that a stability inversion after photocyclization is the basis for the observed unprecedented control over diastereoselectivity.
关键词： diastereoselectivity,diarylethenes,chirality,photochromism,electrocyclization
更新于2025-09-10 09:29:36
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External Reversal of Chirality Transfer in Photoswitches
摘要： The transfer of stereoinformation is at the heart of asymmetric reactions. By incorporating the natural monoterpene L-menthone into the backbone of a diarylethene, we could achieve efficient chirality transfer upon photocyclization resulting in the preferred formation of one major closed isomer in a diastereomeric ratio (dr) of 85 : 15. More significantly, we were able to completely reverse the diastereomeric outcome of the ring-closure, simply by altering the chemical environment or the irradiation conditions. As a result, we could selectively accumulate the less favored minor closed isomer, with remarkable dr values of > 99 : 1 and 74 : 26, respectively. Computations reveal that a stability inversion after photocyclization is the basis for the observed unprecedented control over diastereoselectivity.
关键词： diarylethenes,diastereoselectivity,electrocyclization,chirality,photochromism
更新于2025-09-09 09:28:46