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Abstract A selective fluorescent and colorimetric chemosensor for the detection of Al3+ and CN− was constructed from diarylethene with a salicylidene Schiff base. When triggered by Al3+, the diarylethene exhibited a remarkable fluorescence color change from dark to bright green. The interaction between its open-ring and closed-ring isomer with CN− caused a notable change in its absorption spectrum with significant color change from colorless to yellow and pink to darkcyan, respectively. Additionally, its light and metal-responsive fluorescence behaviors could be applied to logic gate with the fluorescence intensity as output and combinational stimuli of light and chemical species as inputs. Graphical abstract A novel photochromic diarylethene with a salicylidene Schiff base substituent could serve as a selective fluorescent and colorimetric chemosensor for Al3+ and CN− based on completely different mechanisms. Image 1 Highlights • A new diarylethene-based chemosensor by using 2-aminophenol and perfluorodiarylethene via a salicylidene Schiff base linkage was synthesized. • The chemosensor can serve as a selective fluorescent and colorimetric chemosensor for Al3+ and CN− based on completely different mechanisms. • An integrated logic circuit were successfully designed and constructed with the fluorescence intensity as the output signals and the inputs of UV/Vis, Al3+ and EDTA stimuli. [ABSTRACT FROM AUTHOR]

A new photochromic diarylethene derivative with a hydralazine unit was designed and synthesized. It was not only acted as a Zn 2+ sensor with the fluorescent color change from dark blue to bright orange, but also acted as a fluorescent sensor for HSO 4 − with the fluorescent color change from dark blue to bright blue. Furthermore, the derivative also exhibits multi-addressable switching properties by the stimulations of lights and chemical reagents. Based on these characteristics, two combinational logic circuits were constructed with the emission intensity as the output signals, and the UV/vis lights, chemical species as the input signals. [ABSTRACT FROM AUTHOR]

A new photochromic diarylethene with formyl and fluorene groups, 1-[2-methyl-5-(9,9-diethyl-fluoren-2-yl)-3-thienyl]-2-[(2-methyl-5-formyl)-3-thienyl]perfluorocyclopentene, has been synthesized and characterized with single-crystal X-ray diffraction. Due to the interaction between the formyl group in its ring-closed isomer with cysteine/homocysteine, there was an evident color change in its absorption spectrum from blue to pale yellow and light brick-red upon addition of cysteine and homocysteine, respectively. Moreover, it was revealed that no obvious interference was observed during the titrations with the mixtures of cysteine/homocysteine and other amino acids. These results indicated that the diarylethene could be used as a colorimetric sensor to recognize cysteine/homocysteine with high selectivity. [ABSTRACT FROM AUTHOR]

A new photochromic diarylethene with a triazole-linked fluorescein unit has been synthesized by click chemistry and its multi-controllable fluorescence characteristics have been systematically investigated by the stimulation of light, base/acid, and metal ions. The absorption and fluorescence behaviors of the diarylethene displayed sequence-dependent responses via efficient interactions of the fluorescein unit with triethylamine/trifluoroacetic acid and UV/Vis light. As a result, a logic gate was constructed by using combinational stimuli of UV, Vis, and base as three inputs and the fluorescence intensity at 541 nm as the output. Furthermore, the diarylethene could serve as a highly selective ‘turn-on’ fluorescence chemosensor for the recognition of Cu 2+ . When the diarylethene was treated with Cu 2+ and AscH − , the fluorescence intensity at 541 nm was dramatically enhanced by ten fold with remarkable fluorescence change from dark to bright green due to Fenton reaction-assisted fluorescence signal amplification. [ABSTRACT FROM AUTHOR]

New fluorescent derivatives of 1-(thien-2-yl)-3-methyl-9 H -thieno[3,4- b ]-chroman-9-one are synthesized and their spectral properties studied. The prepared fluorescent compounds are combined with several photochromic benzothienyl dihetarylethenes to provide mixed systems exhibiting reversible photo-induced fluorescence modulation in solution. The obtained results are promising for the development of polymeric photochromic recording media with a non-destructive fluorescence readout of optical information for RAM with extra large information capacity. [ABSTRACT FROM AUTHOR]

Photoswitchable nanomaterials are key materials in the development of advanced imaging techniques, such as super-resolution fluorescence microscopy. The combination of perovskite CsPbBr 3 nanocrystals (NCs) with bright photoluminescence (PL) emission and diarylethenes (DAEs) with structural changes in response to ultraviolet (UV) and visible light is a promising candidate system. Herein, CsPbBr 3 NCs are coupled with photochromic DAE molecules to control the PL emission from the NCs by light stimulation. The PL emission is successfully switched ON and OFF by alternating UV and visible light irradiation. Time-resolved PL emission studies suggest that Förster resonance energy transfer from CsPbBr 3 NCs to the closed-ring form of DAE occurs after UV irradiation, and the PL emission is quenched. Upon visible-light irradiation, DAE is converted to the open-ring isomer, and the PL emission is restored. Femtosecond pump-probe spectroscopy reveals that light stimulation induces not only energy transfer but also photoinduced electron transfer in the NC-DAE pair on the picosecond timescale to form DAE radicals. Thus, it is suggested that the holes residing in the NCs react with the NCs, degrading the PL emission. Stable PL switching is realized using 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) as a hole scavenger to avoid the reaction between the holes and NCs., (© 2022 Wiley-VCH GmbH.)

Abstract: We had accomplished recording and readout of bit patterns by two-photon 3D optical storage technology using a new photochromic diarylethene, 1,2-bis(2-methyl-5-methylene-n-butylamido-thien-3-yl) perfluorocyclopentene (BMMBTP), as memory medium. The photochromic reaction, both in solution and in poly(methyl methacrylate) (PMMA) amorphous film, and fluorescence property of BMMBTP were investigated. [Copyright &y& Elsevier]