Karmakar, Manisha and Bag, Sayan Kumar and Mondal, Bijan and Thakur, Arunabha (2022) A conjugated photoresponsive dithienylethene-ferrocene system: applications in secret writing and decoding information. JOURNAL OF MATERIALS CHEMISTRY C, 10 (22). pp. 8860-8873. ISSN 2050-7526, 2050-7534
Full text not available from this repository. (Request a copy)Abstract
Although photoswitchable or photoactivatable fluorescent diarylethenes are extensively applied in various fields such as optical memory, optical transistors, bioimaging, and super-resolution imaging, they encounter drawbacks of fluorescence quenching in the aggregated/solid state. Therefore, the design and synthesis of solid state "turn-on" fluorescent photochromic materials remain a great challenge. Here, in this work, a ferrocene appended dithienylethene (DTE-Fc) bridged pi-conjugated photochromic material, 4o/4c, with high photoreaction quantum yields (Phi(o -> c) = 0.83 and Phi(c -> o) = 0.021) and fatigue resistance properties, was rationally designed. The conversion of pale violet, 4o, to green color, 4c, is associated with a slightly higher rate constant (k(solution) = 0.007 s(-1) and k(solid) = 0.005 s(-1)) than the conversion of 4c to 4o (k(solution) = 0.004 s(-1) and k(solid) = 0.003 s(-1)) both in solution and in the solid state indicating that photocyclization occurs at a higher rate than cycloreversion. It is a unique example of a "turn-on" mode fluorescent (Phi(F) = 0.299) DAE without a traditionally known fluorophore or a S,S-dioxide moiety, in solution and in the solid state. The "turn-on" mode fluorescence behaviour was further validated by the time-resolved fluorescence spectroscopic measurement and quantum chemical calculations (DFT). Furthermore, this DTE-Fc derivative, 4o/4c, is found to be highly efficient in a lithographic technique (erasable ink) and deciphering secret codes (QR/bar code), opening real opportunities for practical applications in anti-counterfeiting.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FLUORESCENT PHOTOCHROMIC DIARYLETHENE; AGGREGATION-INDUCED EMISSION; NONLINEAR-OPTICAL PROPERTIES; EFFECTIVE CORE POTENTIALS; SET MODEL CHEMISTRY; MOLECULAR CALCULATIONS; FATIGUE RESISTANCE; TOTAL ENERGIES; MEMORY; SWITCH |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Feb 2024 06:41 |
| Last Modified: | 15 Feb 2024 06:41 |
| URI: | https://pred.uni-regensburg.de/id/eprint/57560 |
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