Photochromism of palmitoylamide-substituted indoline spiropyrans

A comparative spectral-kinetic and luminescent study of photochromic transformations of two palmitoylamide-substituted indoline spiropyrans was performed in solvents with various polarities and polyvinylbutyral binding and amorphous layers. The compounds were found to be photochromic and form aggregates of two types in addition to the monomeric merocyanine form under the action of UV irradiation. The formation of these photoproducts depended on solvent polarity and the state of aggregation of the substances.     

Photoinduced Modulation of the Emission from СdSe/ZnS Quantum Dots by Photochromic Transformations of Diarylethenes

Crystallography Reports - A spectral study of the interaction between the molecules of photochromic compounds of the diarylethene class and CdSe/ZnS quantum dots (QDs), in dependence of the...     

Synthesis and structure of indoline spiropyrans of the coumarin series

New indoline spiropyrans of the coumarin series were synthesized by the condensation of indoline and hydroxyformylcoumarin derivatives. Spiropyrans, viz., derivatives of 8-formyl-7-hydroxy-4-methylcoumarin and 5-formyl-6-hydroxy-4-methylcoumarin, under irradiation are transformed into open forms, which are recyclized in the dark. The compounds formed by the condensation of the indoline derivatives with 3-formyl-4-hydroxycoumarin have an open structure of the merocyanine dyes and are transformed into spiro forms neither in the dark nor under irradiation with the visible light. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2342–2349, October, 2005.     

Preparation,photochromism, and complex formation with metal ions of pyrazolylazomethine derivative of spirooxazine

New hybrid spirooxazine has been prepared, based on amino-substituted spironaphthoxazine and pyrazolone. Photochromism and photoinduced complex formation with metal ions of the prepared compound has been studied. The effects of solvent polarity and the metal ion nature on the spirooxazine photochromism and the complex formation ability have been elucidated.     

Study of the Possibility of Functionalization of Graphene Oxide Nanoplatelets with Photochromic Chromene and Spiropyrans in Solutions

Russian Journal of General Chemistry - Spectral and kinetic studies of the interaction of the surface groups of graphene oxide nanoplatelets with the molecules of photochromic compounds from the...     

Synthesis of new spirobenzopyrans with two long-chain substituents

Two new photochromic compounds each containing two substituents with long alkyl chains in different parts of a molecule were synthesized by a sequence of direct reduction, acylation, and nitration reactions of substituted spirobenzopyrans. The structures of the compounds synthesized were determined using the ¹H NMR spectra. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2530–2533, November, 2005.     

Study of Selected Spectral Properties and Complex Formation with Transition Metals Ions of a New Schiff’s Base Containing Fluorescein and Sulfamide Fragments

Russian Journal of General Chemistry - A new azomethine based on N-aminofluorescein and ortho-tosylaminobenzaldehyde has been synthesized. Structure and properties of the obtained compound have...     

Optically controlled field effect transistors based on photochromic spiropyran and fullerene C60 films

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Photochromic Systems with Dynamic Adaptive Photobleaching

Results of own investigations on photochromic systems bleaching reversibly under sun light depending on the intensity of excitant radiation are described. The results are aimed to be used for the development of camouflage coatings and civil cloths with photoinduced dynamic automatic color change.

     

Excited State Proton Transfers in Hybrid Compound Based on Indoline Spiropyran of the Coumarin Type and Azomethinocoumarin in the Presence of Metal Ions

Spectral-luminescence properties of a hybrid compound containing a coumarin-type spiropyran and an azomethinocoumarin fragment in toluene-acetonitrile solution in the presence of Li⁺, Ca²⁺, Zn²⁺ and Mg²⁺ ions are reported. Two excited state proton transfers can occur in the hybrid compound—the transfer of a proton from the OH group of the 7-hydroxy coumarin tautomer to the N atom of the C=N bond of the azomethine fragment leading to green ESIPT fluorescence with a maximum at 540 nm and from the OH group of the 7-hydroxy coumarin tautomer to the carbonyl group of the pyrone chromophore, which leads to the formation of the 2-hydroxyl-tautomer T of coumarin with blue fluorescence with a maximum at 475 nm. Dependence of these excited state proton transfers on the metal nature and irradiation with an external UV source is discussed.