O. I. Kobeleva

Spectral-kinetic evidence of interaction of photochromic diarylethenes with silver nanoparticles

Spectral-kinetic investigations of the photochromism of some diarylethenes with sulfur-containing substituents in dimethylsulfoxide solutions with and without silver nanoparticles are performed. It is shown that silver nanoparticles chemically interact with diarylethene molecules, which is manifested in a change in the spectral and kinetic characteristics and photodegradation efficiency.

Photochromic fulgimide-containing silicones immobilized on the surface of polyarylate

Photochromic coatings immobilized on the surface of polyarylate films are prepared on the basis of fulgimides, oligosiloxanes, and oligosilazanes. The irradiation of coatings with UV light at a wavelength of @380 nm and visible light at a wavelength above 500 nm results in photoinduced reversible transitions between open and colored cyclic forms. Photochromic polymer films with the most acceptable characteristics are obtained from fulgimide-containing oligoaminosiloxane and oligovinyldimethylsilazane. It is found that the photosensitivity of these films is higher than that of similar films based on 1,2-dihetarylethenes.

Spectral indications of interaction of functionalized photochromic compounds with Ag and Au nanoparticles

A comparative investigation of the photochromism of photochromic spiropyrans, spirooxazines, and diarylethenes in solutions and in solid-phase films in the absence and in the presence of silver and gold nanoparticles was undertaken by a kinetic spectral method. On the basis of the experimental data it was concluded that hybrid photochromic nanoparticles of the core–shell type can be obtained as a result of chemical reaction of functionalized molecules with the nanoparticles of noble metals.

Investigation of complexation of functionalized 1,3-benzoxazinone spiropyrans with metal ions

For the first time, complexation between the metal ions and the molecules of photochromic benzooxazine spiropyrans was found and studied. The observed spectral-kinetic changes are explained by the complex formation between molecules of the merocyanine type, resulted from the dissociation of -C-O- bonds, and by electrostatic interaction between complex components depending on the compound structure and the metal ion nature.

Studies of complex formation of photochromic hybride spirooxazine with metal ions

Spectral kinetic studies of complex formation of molecules of the hybrid spirooxazine containing spironaphthooxazine, hydroxyazomethine, and azobenzene fragments with a series of cations was carried out. Spectral and kinetic differences in the complex formation between this substance and previously studied spirooxazine derivatives were found.

Synthesis of new spiropyranes and study of the effect of the nature of substituents on their photochromism and complexation

A series of new hydrazones based on 3,3-dimethyl-7-hydroxy-8-formyl-[2H]-1-benzopyran-2,1-[2]-oxaindane] with the substituents of different nature in the hydrazone moiety was synthesized. A comparative study of photochromism and complexation of the synthesized spiropyrans with a number of metal cations was carried out. Spectral and kinetic differences in photochromism and complexation of these compounds were revealed.

Synthesis, photochromic properties, and complex formation with metal ions of hydrazones based on a spiropyran of oxaindane series

A series of hydrazones based on a new spiropyran oxaindane series was synthesized. The compounds were found to possess photochromism and are characterized by a high rate of spontaneous decoloration of their photoinduced merocyanine form. Dark and photoinduced formation of complex compounds in the reaction of metal ions with molecules of the hydrazones in solution was observed.

Spectrokinetic study of photochromic transformations of spironaphthopyran metal complexes

Five new metal complexes of 3,3-bis(phenyl)-5-hydroxy-3H-naphtho[2,1-b]pyran with the Pb2+, Zn2+, Ni2+, UO22+, and Tl2+ ions were synthesized. A comparative spectrokinetic study of photochromic transformations of these complexes and uncoordinated naphthopyran was performed. It was shown that the metal complexes exhibit photochromism properties similar to the reversible phototransformations of the precursor. The differences found in the photochromic transformations are explained by the influence of the metal atom on the conjugated bonds and steric changes in the molecule of the complexes.

Synthesis, photochromism, and complexing ability of new derivatives of N-aminofulgimide

On the basis of N-aminofulgimide two new photochromic compounds of the fulgimide class were synthesized. The performed spectral-kinetic studies have shown that the obtained fulgimide derivatives suffer thermally irreversible transformation similar to those observed for the starting N-aminofulgimide except for the absorption bands of the corresponding cyclic forms to undergo red shift. One of the obtained compounds is capable to form complexes with rare-earth metal ions.