Construction of Supramolecular Photochromic System

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1 Photochromism of Fulgides in Amorphous GlassesAn indolylfulgide showed the ordinary photochromism in the amorphous organic glasses prepared by sol-gel method. It has been shown that organic glasses can be used for application of fulgides to materials such as optical recording media.2 Reversible Complexation between Fulgimide and Diaminopyridine DerivativesThe association constants between fulgimide and guest molecules such as 2,5-diacylaminopyridine which can form complementary multiplex hydrogen-bonding can be altered largely by photoirradiation.3 Reversible Control of Cholesteric Pitch Values of Cholesteric Liquid CrystalsAddition of chiral photochromic dopant such as binaphthol-condensed indolylfulgide to nematic liquid crystals induced cholesteric liquid crystaline phase. Photoirradiation changed the cholesteric pitch length largely. This phenomena can be used to control the selective reflection wavelength of cholesteric phases.4 Complexation and Photochromism of Crowned FulgenatesPhotochromism of fulgenate derivatives possessing crown-ether moieties as the cyclic diesters was clarified. Addition of alkali metal cations, which fit the crown-ether rings, to the open forms inhibited photochromic ring closing coloration reactions because of changing of molecular conformations. Control of photochromic properties by co-existing chemical species was thus achieved.