A new photochromic system - potential limitations and perspectives

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Abstract
A definition and a survey of property changes of photochro- mic systems is given. The known photochromic molecules are treated. A new class of photochromics is introduced, proper- ty changes are discussed and a short general overview of applications for classical and new systems is presented. Chemistry, especially photochemistry is developing rapidly in new directions. Whereas in the past molecules and their properties have been in the center of interest this aspect is only the basis for further problems or questions. Functions of molecules are an additi- onal requirement which have to be investigated. Functions open then a way to applications either in the field of material science or life sciences. Photochromism is an exemplary field in this respect (ref. 1). This paper is treating these aspects in the context mentioned. Photochromism can be defined in simple terms as a light induced (at last in one direction) conversion of a species A to an isomer B, where A and B have different absorption spectra and energy content.

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