The precursors and hybrid compounds, including photochromic fulgimides and fluorescent benzothiazolylthienothiophene units, have been synthesized. Spectroscopic investigations by absorption and fluorescence methods showed that fulgimide hybrids display photochromism, but do not display fluorescence properties. A possible explanation for this fact is proposed and also the decreased effectiveness of photochromic conversion.Currently photochromic materials are actively under consideration as potential recording media for three-dimensional storage [1]. Important properties which determine their utility for these uses are nondestructive sensing of optical information, which is possible only in those cases when the sensed irradiation is not absorbed by two forms of photochromic compounds mutually transformed under the influence of light. One of the most fruitful routes for the solution of this problem is the creation of photochromic materials capable of sensing optical information by the fluorescence method [2,3]. For this objective in particular hybrid photochromic compounds were synthesized which contained in their structure both photochromic and fluorophoric units [4][5][6][7][8][9] in which the absorption bands of the fluorescent part of the molecule were located in addition to the adsorption bands of the two forms of the photochromic part, but the fluorescent spectrum coincides with the absorption spectrum of one of the forms of the photochromic compound.In the present work an attempt was made to synthesize new hybrid compounds based on photochromic amino-substituted fulgimides and fluorescent derivatives of benzothiazolylthienothiophene.
We showed previously that derivatives of 3-acetyl-2-furylchromones are promising components of recording media for providing a single two-photon record on multilayer optical disks of ultra-high information capacity [1,2]. It is known that 3-acetyl-2-furylchromones in the initial form A do not possess fluorescence, but on irradiation with UV light undergo irreversible photochemical conversion with the formation of the fluorescing form B [1-4], which provides multiple fluorescent reading of optical information.In the present work we have continued the study of the effect of structural factors on the photochemical properties of 3-acyl-2-furylchromones. In the previous investigation it was shown that the spectral characteristics of chromones depend to a significant extent on the substituents in the furan ring. The introduction of halogen atoms or a nitro group leads to a strong bathochromic shift of the absorption band of the initial form A, and also a shift of the absorption and fluorescence band of the photoproduct B [2]. It seemed expedient to study the effect of donor groups on the photochemical and fluorescent properties of chromones.
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