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Kozlov N.G.,National Academy of Sciences of Belarus | Bondarev S.L.,Minsk State Higher Radiotechnical College | Knyukshto V.N.,National Academy of Sciences of Belarus | Odnoburtsev B.A.,National Academy of Sciences of Belarus | Basalaeva L.I.,National Academy of Sciences of Belarus
Russian Journal of Organic Chemistry | Year: 2010

The three-component condensation of 1- or 2-naphthylamines, aromatic aldehydes, and methyl 2-(benzo[1,3]dioxol-5-yl)-4,6-dioxocyclohexane-1- carboxylate led to the formation of methyl 9-(cis,trans)-10-(1,3- benzodioxol-5-yl)-7-aryl-8-oxo-7,8,9,10,11,12-hexahydrobenzo[c] acridine-9-carboxylates or methyl 10-(cis,trans)- 9-(1,3-benzodioxol-5-yl)-12- aryl-11-oxo-7,8,9,10,11,12-hexahydrobenzo[a]acridine-10-carboxylates. The spectral luminescence properties of compounds obtained were investigated in ethanol at 293 and 77 K. © Pleiades Publishing, Ltd., 2010. Source


Bondarev S.L.,Minsk State Higher Radiotechnical College | Knyukshto V.N.,B. I. Stepanov Institute of Physics | Tikhomirov S.A.,B. I. Stepanov Institute of Physics | Buganov O.V.,B. I. Stepanov Institute of Physics | Pyrko A.N.,International Sakharov Environmental University
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2012

Using methods of steady state luminescence and femtosecond spectroscopy, we have studied the mechanism of intramolecular proton transfer in synthesized 3,7-dihydroxy-2,8-di(4-methoxyphenyl)-4H,6H-pyrano[3,2-g]chromen-4,6-dion in polar and nonpolar solutions, films, and polycrystals at 293 and 77 K. In an excited singlet state, intramolecular proton transfer occurs in two stages. At the first stage, a tautomer with one transferred proton (OTP tautomer) is formed from the Franck-Condon state within τ1 = 0.6 ps. At the second stage, the second proton is transferred within τ2 = 3.1 ps and a tautomer with two transferred protons (TTP tautomer) is formed, which fluoresces in toluene at 293 K with a high quantum yield, Φf = 0.66, and the fluorescence spectrum of which is characterized by a large Stokes shift, 9900 cm-1. At 293 K, polar solvents (dimethylformamide, dimethyl sulfoxide, ethanol, etc.) solvate the BFV molecule in the ground state, while, in the excited state, an OTP tautomer is mainly formed. In polar ethanol at 77 K, a dual fluorescence spectrum is observed, which is caused by the fluorescence emission of polysolvates with λf max = 460 nm and TTP phototautomers at λf max = 610 nm. © Pleiades Publishing, Ltd., 2012. Source


Kozlov N.G.,National Academy of Sciences of Belarus | Kozlov N.G.,Minsk State Higher Radiotechnical College | Kozlov N.G.,Ivan Franko National University of Lviv | Bondarev S.L.,National Academy of Sciences of Belarus | And 20 more authors.
Russian Journal of Applied Chemistry | Year: 2014

9,9-Dimethyl-12-[(5-aryl-2-furyl) (or 5-aryl-2-thienyl, or 5-aryl-1-methyl-1H-pyrrolyl)]-7,8,9,10,11,12-hexahydrobenzo[a]acridin-11-ones were synthesized, and their absorption and luminescence spectrum characteristics in ethanol at room temperature and at 77 K were studied. The spectra suggest the existence of these compounds in a liquid solution as mixtures of conformers, each of which is characterized by its own absorption and fluorescence spectra. © 2014 Pleiades Publishing, Ltd. Source

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