WATER-SOLUBLE ORGANIC PHOTOCHROMES - SULFONATED SPIRO (INDOLINONAPHTHOXAZINES)

Authors
ALLEGRINI P MALATESTA V
Citation
P. Allegrini et V. Malatesta, WATER-SOLUBLE ORGANIC PHOTOCHROMES - SULFONATED SPIRO (INDOLINONAPHTHOXAZINES), Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 246, 1994, pp. 25-28
Citations number
10
Categorie Soggetti
Crystallography
Journal title
Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals → ACNP
ISSN journal
1058725X
Volume
246
Year of publication
1994
Pages
25 - 28
Database
ISI
SICI code
1058-725X(1994)246:<25:WOP-SS>2.0.ZU;2-H
Abstract
Two photochromic disulphonated spiro (indolino-naphthoxazines) have be en synthesized. Both compounds crystallize in the open merocyanine for m. The molar extinction coefficients of the coloured forms have been c alculated and the rate constant kb for the thermal bleaching measured. The presence of sulphonic groups lowers the kb value by two orders of magnitude with respect to that of the unsubstituted compound.