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Substitution effect...
Substitution effect on the photochromic properties of benzo[b]thiophene-1,1-dioxide based diarylethenes
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Chen, Shangjun (författare)
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Li, Wenlong (författare)
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- Li, Xin (författare)
- KTH,Teoretisk kemi och biologi
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Zhu, Wei-Hong (författare)
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(creator_code:org_t)
- 2015
- 2015
- Engelska.
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Ingår i: RSC Advances. - : Royal Society of Chemistry. - 2046-2069. ; 5:106, s. 87626-87634
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Benzo[b]thiophene-1,1-dioxide based diarylethenes (DAEs), BTT-1 to BTT-4, containing methyl, phenyl, formyl and triphenylamine groups at the 5,5'-position of the thiophene rings have been developed for gaining an insight into the substituent effect on the absorption and photochromic properties. Electron-donating substituents, such as phenyl and triphenylamine groups, are found to be effective at shifting the absorption band to a longer wavelength and decreasing the cyclization quantum yield. The electron-withdrawing formyl group can increase the cyclization quantum yield, but it reduces the thermal stability of the ring-closed isomer to some extent. BTT-4 bearing a triphenylamine group shows the poorest fatigue resistance among these four compounds, which is possibly due to the larger extended pi-conjugation length in the ring-closed isomer. BTT-2 bearing a phenyl unit undergoes typical photochromic reaction not only in solution, but also in PMMA thin film and in bulky crystals with excellent fatigue resistance and thermal stability.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- Ethene Bridge; Hindered Diarylethenes; Molecular Switch; Logic Gates; Bisthienylethene; Derivatives; Light; Dithienylethenes; Photocyclization; Naphthalimide
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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