Organic photochromic molecules

Other Systems Using Organic Photochromic Molecules. 107... 

The photochemical as well as thermal behavior of organic photochromic molecules is influenced in various ways by the characteristics of the polymer media in which they are incorporated. More importantly, the interaction between the photochromic and polymeric entities can lead to novel photoinduced properties beyond the obvious color changes. Because of this, photochromic polymers have been of extensive interest in interdisciplinary research. 

Perhaps the largest class of organic photochromic molecules are those based on symmetry-allowed electrocyclic ring closure and opening. A variety of examples exist spiropyrans, naphthopyrans, fulgides, and diarylethenes. 

V. A. Krongauz, Environmental effects on organic photochromic systems, in Photochromism Molecules and Systems (H. Durr and H. Bouas-Laurent, eds.), pp. 793-821, Elsevier, Amsterdam (1990). 

The loss of response in a photochromic system (i.e., the irreversible formation of nonphotochromic products) is commonly referred to as fatigue (Scheme 4). Although the open form is most commonly implicated, both the closed and open forms of a photochromic molecule may be capable of undergoing such nondesirable thermal or photochemical reactions. Much like dyes, organic photochromic... 

Y. Ma, G. Cortellaro, and H. Durr, Preparation of photochromic molecules with polymerizable organic functionalities, Synthesis 3, 294-297 (1995). 

This book, Organic Photochromic and Thermochromic Compounds, is the fourth major treatise on photochromism involving organic molecules and derived systems. The first such book was edited by G. H. Brown in the Weissberger series in 19711, the second was edited by H. Durr and H. Bouas-Laurent in the Elsevier series in 19902. 

The interplay between photochromic molecules and organized molecular or macromolecular assemblies is expected to provide wide opportunities for creating new classes of photonic materials. Regarding light-triggered molecular... 

Whittal J (1990) In Durr H, Bouas-Laurent H (eds) Photochromism, molecules and systems. Studies in organic chemistry, vol 40. Elsevier, Amsterdam, chap 9, p 467... 

General G. H. Brown, Photochromism 1971, Wiley, New York Photochromism, Molecules and Systems H. Dlirr, H. Bouas-Lauient (Eds.), 1990, Elsevier, Amsterdam Frontiers in Supramolecular Organic Chemistry and Photochemistry... 

L. Zechmeister, Cis-Trans Isomeric Carotenoids, Vitamins A and Arylpolyenes, Vienna, Springer, 1962 S. E. Braslavsky, in Photochromism, Molecules and Systems, Studies in Organic Chemistry, Vol. 40, H. Diirr and H. Bouas-Laurent, Eds., Elsevier, Amsterdam, 1990, p. 738 M. Ottolenghi, Adv. Photochem. 12,97 (1980). 

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