Low‐temperature surface‐active complex‐radical oligodert.Alkylperoxidic initiators

Carbon‐chain functional surface‐active oligoperoxides (FSAP) with ditertiary peroxidic, carboxyl or hydroxyl groups form stable oligoperoxidic metal complexes (OMC) through their interaction with transition metal salts in organic solutions. The mole fraction and formation constants of OMC are interrelated with the microstructures of FSAP, first of all, with the disposition of complex forming groups. Increasing the set of FSAP conformational structures promotes the enhancement of the local concentrations of reactants in the reaction zone during complex formation, thereby increasing the probability that the reaction will proceed. The kinetic and thermodynamic characteristics of the decomposition of peroxide fragments of FSAP in the aqueous medium providing the formation of controlled amount of free radicals, thereby the initiation of emulsion polymerization processes were investigated. The realization of the process of decomposition of – O:O – bonds as a result of homolytic dissociation or/and Red‐Ox reactions depending media polarity and OMC nature were assumed.     

Spectral and Luminescent Properties of Bis(azomethine) Based on 2-Hydroxy-1-Naphthaldehyde and 2,3-Diaminopyridine

High Energy Chemistry - The spectral and luminescent properties of solutions of bis(hydroxynaphthoazomethine) of the pyridine family have been studied in comparison with the analogue of the benzene...     

Fusibility of Agricultural Plant Waste Ash under the Conditions of High-Temperature Processing

Russian Journal of Applied Chemistry - Agricultural plant wastes such as wheat straw, rice hulls, and sunflower-seed husks were characterized experimentally. The chemical composition of the ash...     

Synthesis and Spectral-Luminescent Properties of Fluorescent Dyads Based on Tetraarylimidazole and Azomethines of Various Nature

Russian Journal of General Chemistry - Synthesis and structure of two novel dyads including two fluorophores - 1,2,4,5-tetraarylimidazole and azomethine fragments of different nature, have been...     

Dynamics of photoprocesses in novel bifunctional salicylideneiminospironaphthoxazines

The dynamics of photochemical processes in a number of novel photobifunctional compounds, whose molecules combine a photochromic spironaphthoxazine fragment with the salicylideneimine moiety containing different substituents, was studied by the flash photolysis technique. Three products of photolysis of these compounds were detected, and the effects of the substituents and the solvent nature (toluene and methanol) on their spectral and kinetic characteristics and quantum yields were studied.     

The photochromic properties of indoline spirooxazine-thermoplastic polymer systems obtained by supercritical fluid impregnation

The impregnation of thermoplastic polymers (polyethylene, polypropylene, polymethyl methacrylate, and polycarbonate) with photochromic compounds from the class of indoline spirooxazines in supercritical carbon dioxide (SC-CO₂) was studied. The concentration of the photochrome and the kinetics of decolorization of its colored form depended strongly on the type of the polymer matrix and the structure of spirooxazine. The introduction of 1,3′,3′-trimethylspiro(indoline-2′,3-3H-anthraceno[2,1-b][1,4]oxazine) (SAO) into polycarbonate caused anomalous stabilization (the prolonged conservation of the excited colored form of SAO in the polymer matrix). In contrast to other photochrome-polymer pairs, after supercritical impregnation into polycarbonate, at least 10% of all SAO molecules were in the colored form, which was highly stable and did not decolorize after 150 days; the rest of the impregnated SAO molecules were localized in the matrix as individual molecules, partially colorized after matrix relaxation, or nanocrystals of characteristic sizes ∼10–20 nm. The mechanisms of the anomalous stabilization of the colored SAO form in the polycarbonate matrix are discussed. Original Russian Text ? N.N. Glagolev, A.B. Solov’eva, A.V. Kotova, V.T. Shashkova, B.I. Zapadinskii, N.L. Zaichenko, L.S. Kol’tsova, A.I. Shienok, P.S. Timashev, V.N. Bagratashvili, 2009, published in Zhurnal Fizicheskoi Khimii, 2009, Vol. 83, No. 5, pp. 985–992.     

Spectral, luminescent, and photochemical properties of o-hydroxyazomethinespiropyrans in solid matrices

Spectral, luminescent, and photochemical properties of the novel bifunctional compounds BF1 and BF2 based on indoline spiropyrans and o-hydroxyazomethines have been studied in solid media. In PMMA films and frozen solutions, redistribution of photoexcitation relaxation channels in favor of photochemical processes leading to photochromic products in the azomethine moiety and luminescence is observed as compared with liquid solutions.     

Photochromic transformations of amphiphilic spiropyran in acetonitrile solutions and at the air/water interface

Russian Chemical Bulletin - The results of a study of the photochromic properties of 1´-hexadecyl-3´,3´-dimethyl-6-nitro-1´,3´-dihydrospiro[chromene-2,2´-indole] (SP)...     

Synthesis and properties of a novel photochromic luminophore

A photochemically bifunctional compound was obtained. Its molecule includes the spironaphthoxazine and dansylamino fragments. This compound exhibits both photochromic and luminescent properties. Its spectroscopic characteristics were studied in different solvents. The electronic systems of two constituent fragments do not interact with each other. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2802–2805, December, 2005.     

Kinetics of photochemical reactions of spironaphthopyran azomethine upon photoexcitation with light of different wavelengths

Spectral and kinetic characteristics of photolysis products in methanol of the photobifunctional compound, whose molecule contains the photochromic spironaphthopyran fragment as well as the hydroxynaphthylmethylenimine fragment in which intramolecular proton transfer can occur in the ground and excited states of the molecule, were studied by the method of nanosecond laser photolysis with excitation with light of wavelengths 337, 430, and 470 nm. The relative quantum yields of the formation of different photoproducts and their kinetic characteristics were measured. The dependence of the relative yield of the photoproducts of different nature on the wavelength of excitation light was revealed.