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Titolo:
Photochromic reaction and fluorescence of dithienylethenes in solid states
Autore:
Kasatani, K; Kambe, S; Irie, M;
Indirizzi:
Yamaguchi Univ, Fac Engn, Dept Adv Mat Sci & Engn, Ube, Yamaguchi 7558611,Japan Yamaguchi Univ Ube Yamaguchi Japan 7558611 , Ube, Yamaguchi 7558611,Japan Kyushu Univ, Grad Sch Engn, Dept Chem & Biochem, Fukuoka 8128581, Japan Kyushu Univ Fukuoka Japan 8128581 Chem & Biochem, Fukuoka 8128581, Japan
Titolo Testata:
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
, volume: 345, anno: 2000,
pagine: 369 - 374
Fonte:
ISI
Lingua:
ENG
Soggetto:
REVERSIBLE PHOTOCYCLIZATION; DIARYLETHENE DERIVATIVES; SYSTEMS;
Keywords:
1,2-diarylethenes; photochromism; colloidal solution; amorphous film; polymer cast film; fluorescence;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Kasatani, K Kyushu Univ, Inst Fundamental Res Organ Chem, Fukuoka 8128581,Japan Kyushu Univ Fukuoka Japan 8128581 em, Fukuoka 8128581, Japan
Citazione:
K. Kasatani et al., "Photochromic reaction and fluorescence of dithienylethenes in solid states", MOLEC CRYST, 345, 2000, pp. 369-374

Abstract

Photochromic cyclization reaction efficiency and fluorescence of colloidalsolutions, amorphous films, and polymer cast films of two dithienyletheneswere studied. Photochromic cyclization reaction efficiency of colloidal solution of cis-1,2-dicyano-1,2-dithienylethene (1) was as high as that of hexane solution of 1. Amorphous films of 1 also showed high efficiency. On the other hand, neither colloidal solution nor polycrystal of 2,3-bis(2,4,5-trimethyl-3-thienyl)maleic anhydride (2) was photochromic; only amorphous films of 2 were colored very slightly by UV irradiation. While photochromic cyclization reaction efficiency of 1 depends little on the kind of polymer matrix, that of 2 depends significantly on the Tg (glass transition temperature) and polarity of polymer matrix, Long-wavelength fluorescence which canbe assigned to the colored closed-ring form was observed for 1 in the solid states, though deeply colored hexane solution did nor give any long-wavelength fluorescence.

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Documento generato il 26/09/20 alle ore 11:57:31