Supramolecular photochemistry is an emerging and rapidly growing research area, most attractive from fundamental point of view and very promising for a variety of applications. An appropriate assembly of molecular components capable of performing light-induced functions can be called a photochemical molecular device (PMD). The most functions that can be performed by PMDs are (i) generation and migration of electronic energy, (ii) photoinduced vectorial transport of electric charge, (iii) photoinduced conformational changes, and (iv) control and tuning of photochemical and photophysical properties. On the other hand, by the low-temperature sol-gel process are produced rigid and porous xerogel materials. The important point is that the sol-gel materials are transparent, therefore can be used as hosts for supramolecular photo-chemical devices.
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