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  1. No Access

    Article

    Proteolytic Equilibria of Vanillic Acid in the Ground and Excited States

    Proteolytic equilibria of vanillic acid in aqueous solutions were studied using electronic spectroscopy. The pH ranges for anionic, dianionic, cationic, and neutral forms of vanillic acid in the ground and exc...

    O. V. Vusovich, O. N. Tchaikovskaya, I. V. Sokolova… in Journal of Applied Spectroscopy (2016)

  2. No Access

    Article

    Sulfation of arabinogalactan by sulfamic acid in dioxane

    The sulfation of arabinogalactan (AG) by sulfamic acid in the presence of urea in dioxane has been studied. The degree of AG sulfation increases as the sulfation temperature increases from 70 to 95°C. As indic...

    N. Yu. Vasil’eva, A. V. Levdansky… in Russian Journal of Bioorganic Chemistry (2015)

  3. No Access

    Article

    Effects of Subcutaneous Microcrystalline Cellulose Sulfate Extracted from the Wood of the Siberian Fir (Abies sibirica Ledeb) on the Clotting of Rabbit Plasma

    The anticoagulant activity of the microcrystalline cellulose sulfate (MCCS) extracted from the wood of Abies sibirica Ledeb (molecular weight 86,000, sulfur substitution level 1.63) were studied in vitro and ex v...

    N. N. Drozd, S. A. Kuznetsova, E. Yu. Savchik… in Pharmaceutical Chemistry Journal (2015)

  4. No Access

    Article

    Experimental and Quantum-Chemical Study of Electronically Excited States of Protolytic Isovanillin Species

    Methods of electronic spectroscopy and quantum chemistry are used to compare protolytic vanillin and isovanillin species. Three protolytic species: anion, cation, and neutral are distinguished in the ground st...

    O. V. Vusovich, O. N. Tchaikovskaya, I. V. Sokolova… in Russian Physics Journal (2014)

  5. No Access

    Article

    Quantum-Chemical Study of Proton Transfer and Photoreactions of Quinolone Derivatives

    The possible routes of deactivation of electronically excited states of 4-methyl-7-hydroxy-2-quinolone and its protolytic forms were analyzed. The relative contribution of radiative and nonradiative deactivati...

    N. Yu. Vasil'eva, O. V. Vusovich, N. M. Kozhevnikova in High Energy Chemistry (2002)

  6. No Access

    Article

    Quantum-chemical study of the spectral properties of stilbene isomers

    Calculations of absorption spectra of cis-and trans-forms of stilbene by the quantum-chemical method of intermediate neglect of differential overlap with spectroscopy parametrization were carried out. The electro...

    O. V. Dolgova, N. Yu. Vasil’eva, I. V. Sokolova in Optics and Spectroscopy (2002)

  7. No Access

    Article

    Nature of the Electron Excited States and Energy Transfer in Bichromophore Coumarin Molecules

    Results of experimental and theoretical research for three bichromophore molecules, trans-stilbene-CH2-coumarin 120 (I), 4-methylumbelliferone-CH2-UC 17, and 4-(3-fluoro)-methylumbelliferone-CH2-UC 17 (II, III), ...

    N. Yu. Vasil'eva, I. V. Sokolova, L. G. Samsonova… in Journal of Fluorescence (1999)

  8. No Access

    Article

    Electronic structure, spectra, and nature of electronically excited states of the bifluorophores stilbene-CH2-coumarine and phenyl-CH2-coumarine

    Quantum-chemical calculations of trans-stilbene and benzene molecules as well as molecules of bifluorophores based on them — trans-stilbene-CH2-coumarine 120 and phenyl-CH2-coumarine — were performed by the INDO/...

    I. V. Sokolova, N. Yu. Vasil'eva, Ya. O. Vylegzhanina… in Russian Physics Journal (1993)

  9. No Access

    Article

    Spectroscopy and electronic structure of coumarins with fixed amine and 3-substitution derivatives of coumarin 1

    The method of partial neglect of differential overlap has been used with spectrometric parametrization to calculate the electronic structure and absorption spectra of Kl and its 3-substitution derivatives as w...

    N. Yu. Vasil'eva, I. V. Sokolova, N. F. Vasil'ev in Soviet Physics Journal (1991)

  10. No Access

    Article

    Effect of alkylamino group fixation on the spectral-luminescence properties of coumarines and their ability to participate in intermolecular interactions

    The spectral-luminescence properties of substituted 7-alkylaminocoumarines with nonfixed and fixed amino groups and AC3F are studied theoretically and experimentally. The calculation is carried out by the meth...

    I. V. Sokolova, N. Yu. Vasil'eva, L. I. Loboda, E. A. Sidorenko… in Soviet Physics Journal (1986)