Results 151 to 160 of about 3,195 (187)

Spectroscopic studies of the solvation of carbon dioxide in protic and aprotic solvents

Journal of Molecular Liquids, 1990
The asymmetric C=0 stretching band (υ 3 ) for dilute solutions of carbon dioxide in a range of protic and aprotic solvents has been measured. Relative to «inert» solvents such as cyclohexane and tetrachloromethane, both classes of solvent induce high frequency ...
Graham Eaton, Martyn C.R. Symons
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Cellulose Swelling by Aprotic and Protic Solvents: What are the Similarities and Differences?

Macromolecular Chemistry and Physics, 2008
AbstractThe swelling of microcrystalline, native and mercerized cotton and eucalyptus celluloses by 16 aprotic solvents was investigated. The number of moles of solvent/anhydroglucose unit, nSw, correlates well with solvent molar volume, basicity and dipolarity/polarizability.
Ludmila C. Fidale, Naiara Ruiz, Thomas Heinze, Omar A. El Seoud   +3 more
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Photophysical Properties of Coumarin-30 Dye in Aprotic and Protic Solvents of Varying Polarities¶

Photochemistry and Photobiology, 2004
ABSTRACTExperimental results on various photophysical properties of coumarin‐30 (C30) dye, namely, Stokes' shift (Δv), fluorescence quantum yield (τf), fluorescence lifetime (τf), radiative rate constant (kf) and nonradiative rate constant (knr), as obtained using absorption and fluorescence measurements have been reported.
Sadasivam, Senthilkumar, Sukhendu, Nath, Haridas, Pal   +2 more
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Kinetic solvent effects on acid-catalyzed hydrolysis of sucrose in aqueous mixtures of some protic, aprotic, and dipolar aprotic solvents

Canadian Journal of Chemistry, 1986
Rate constants of acid-catalyzed hydrolysis of sucrose (S) to D-glucose and L-fructose have been determined at 25 °C by optical rotation measurements in aqueous mixtures of protophobic protic glycerol (GL), protophilic protic urea (UH), aprotic dioxane (D), and dipolar aprotic dimethyl sulphoxide (DMSO). Transfer free energies of the substrate sucrose,
Urmila Mandal, Kaushik Das, Kiron Kumar Kundu   +2 more
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Products of the reactions of sparteine-2-thione with CuBr2 in protic and aprotic solvents

Polyhedron, 2011
Abstract Reactions of copper(II) bromide with racemic sparteine-2-thione (SSp) in a 1:1 M ratio yielded two new complexes, whose structures depend on the solvent used. In acetonitrile, the reaction product is a sulfur-bridged dinuclear [CuBr2(μ-SSp)]2 complex (1) in which sparteine-2-thione acts as a bridging S-ligand, while in methanol it is a CuBr2
Urszula Rychlewska, Beata Warżajtis, Beata Jasiewicz, Tomasz Toliński   +3 more
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Electrochemical and photochemical reduction of a series of azobenzene dyes in protic and aprotic solvents

Coloration Technology, 2003
The electrochemical and photochemical reduction in ethanol of a series of azobenzene dyes containing tertiary amine groups has been investigated. It has been shown that the two mechanisms are of parallel importance and an explanation suggested using quantum chemical calculations (AM1, DFT).
R Podsiadły, J Sokołowska, A Marcinek, J Zielonka, E Chrześcijańska, A Socha   +5 more
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Photolysis of acetyl esters of 2,2′-dinitrodiphenyl-carbinols in protic and aprotic solvents

Research on Chemical Intermediates, 1991
Irradiation ofacetyl esters of 2,2′-dinitrodiphenyl-carbinols (1a-d) in aprotic medium like 2-propanol yielded dibenzol [c,f]-[1,2]diazepin-11-one-5-oxides (5a-d) as the major product. Dibenzoi[c,f]-[1,2]diazepin-11-one (2a-d), 2,2′-dinitrobenzophenones (3a-d), 2-amino-2′-nitrobenzophenones (4a-d), and N-hydroxyacridones (6a-d) were also formed in ...
T. Mathew, C. P. Joshua
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SET-LRP of 2-hydroxyethyl acrylate in protic and dipolar aprotic solvents

Polymer Chemistry, 2013
Cu(0) wire-mediated single-electron transfer living radical polymerization (SET-LRP) of 2-hydroxyethyl acrylate (HEA) was performed in protic solvents, MeOH, binary mixtures of MeOH and EtOH with HO, and HO, and in the dipolar aprotic solvent, DMSO.
Leng, X.; Nguyen, N. H. van Beusekom, Wilson, D.A., Percec, V.   +6 more
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Infrared Spectroscopic Study of the Solvation of Tetramethylurea in Protic + Aprotic Mixed Solvents

Journal of Solution Chemistry, 2002
The infrared spectra of tetramethylurea have been measured in mixtures of dimethylsulfoxide or acetonitrile with D2O or deuterated methanol (CH3OD). Marked solvatochroism is observed for bands associated with the C=O and C–N stretches of tetramethylurea, with the former moving to lower wavenumber, and the latter to higher, as the concentration of the ...
G. Rezaei Behbehani, Marie Dillon, Jennifer Smyth, W. Earle Waghorne   +3 more
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Protic vs Aprotic Solvent Effect on Proton Transfer in 3-Hydroxyisoquinoline: A Theoretical Study

The Journal of Physical Chemistry A, 2015
In this work, the structures, energetics, and tautomerizations in 3-hydroxyisoquinoline (3HIQ) in both the ground state and the excited state have been theoretically investigated by the MP2, TDDFT, and CASPT2 methods, respectively. The solvent effect including the implicit solvent and explicit solvent on the structures, energetics, and tautomeizations ...
Bo, Xiao, Yan-chun, Li, Xue-fang, Yu, Jian-bo, Cheng   +3 more
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