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International Journal of Photoenergy
Volume 3, Issue 3, Pages 153-163
http://dx.doi.org/10.1155/S1110662X01000198

Photobehaviour of Z-1,2-di-(3-methoxynaphth-2-yl)ethene as model compound of biphotochromic supermolecules with Z-ethenic bridge

1Università di Perugia, Dipartimento di Chimica, Perugia 06123, Italy
2Université de la Méditerranée, Faculté des Sciences de Luminy, UMR CNRS 6114, Marseille Cedex 9 13288, France

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This work is part of a research project aimed at investigating the behaviour of biphotochromic supermolecules where two photochromic units of the spirooxazine or chromene series are linked through a conjugated or unconjugated spacer. Preliminary investigations showed that the compounds with ethane, acetylene or ester bridges behave as classical photochromes while those with an ethene bridge showed good coloration accompanied by unusual thermal irreversibility at room temperature. The temperature effect on the spectral behaviour allowed such irreversibility to be explained by the occurrence of a cyclization process at the central ethene bond, typical of Z-diarylethenes. To better understand this photobehaviour, a deep investigation of a model molecule, Z-1,2-di-(3-methoxynaphth-2-yl)ethene, was carried out. This paper reports the results obtained on the model molecule and two biphotochromic systems containing benzochromene and spirooxazine units.