Results 181 to 190 of about 12,878 (240)

Photooxidation of Co-thiolato complexes in protic and aprotic solvents

Chemical Communications, 2006
Protic solvents decrease the susceptibility of the thiolate ligand in Co(III) thiolato complexes toward attack by singlet oxygen, but greatly increase the conversion of the peroxidic intermediate to the sulfenato product.
Billy, Hernandez, Yanju, Wang, Dong, Zhang, Matthias, Selke   +3 more
openaire   +2 more sources

Formation, stability and catalase-like activity of mononuclear manganese(ii) and oxomanganese(iv) complexes in protic and aprotic solvents

, 2020
Synthetic compounds as biomimics of catalase enzymes may have potential biomedical applications as therapeutic agents for the detoxification of H2O2 and may give further information about the role of metal cofactors during the dismutation process.
Balázs Kripli, Zoltán Garda, B. Sólyom, Gyula Tircsó, J. Kaizer   +4 more
semanticscholar   +1 more source

Aminolysis of oxime ethers in protic and aprotic solvents

Journal of the Chemical Society, Perkin Transactions 2, 1989
Reactions of oxime ethers with the primary amines, n-propyl-, n-butyl-, n-pentyl-, and n-hexylamine in DMSO, DMF, and MeCN are strongly catalysed by general bases. The observed secondorder rate constants (kA) exhibit a curvilinear dependence on amine concentration leaving a positive intercept.
Ajay K. Jain, Anurag Kumar, Kula N. Sarma   +2 more
openaire   +1 more source

Entering chloride kinetic isotope effects in protic and aprotic solvents

Journal of the American Chemical Society, 1976
Chlorine kinetic isotope effects for the reaction of ethylene oxide and chloride ion are normal (/sup 35/Cl//sup 37/Cl greater than unity) in protic solvents and in acetone and dimethylformamide (DMF) in the presence of 1 equiv of 2,6-lutidinium ion. In the presence of 0.1 equiv of this cation (and 0.9 of Li/sup +/) the isotope effect in DMF is inverse
Thomas H. Cromartie, C. Gardner Swain
openaire   +1 more source

Isotropic magnetic shielding constants of retinal derivatives in aprotic and protic solvents

The Journal of Chemical Physics, 2013
We investigate the nuclear isotropic shielding constants σ(13C) and σ(17O) of isomers of retinoic acid and retinal in gas-phase and in chloroform, acetonitrile, methanol, and water solutions via Monte Carlo simulation and quantum mechanics calculations using the GIAO-B3LYP/6-311++G(2d,2p) approach.
G, Colherinhas, T L, Fonseca, M A, Castro, K, Coutinho, S, Canuto   +4 more
openaire   +2 more sources

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
openaire   +2 more sources

Diffusion of symmetrical and spherical solutes in protic, aprotic, and hydrocarbon solvents

Journal of Solution Chemistry, 1979
The diffusion coefficients of a series of symmetrical tetraalkyltins (tetramethyltin, tetraethyltin, tetrapropyltin, tetrabutyltin, tetradodecyltin) of the gases argon, krypton, xenon, methane, and tetramethylmethane and of carbon tetrachloride and tetraethylmethane in hexane, decane, and tetradecane at 25°C have been determined using the Taylor ...
D. Fennell Evans, Toshihiro Tominaga, C. Chan   +2 more
openaire   +1 more source

Solvent effect on nonradiative process of pyronin B in protic and aprotic solvent systems

Journal of Luminescence, 2002
Abstract Absorption and emission spectra of pyronin B were taken in acetonitrile and acetonitrile-benzene solvent mixtures. Fluorescence lifetime (τf) and quantum yield (Φf) were determined as a function of temperature and nonradiative rate constant (knr) was calculated from τf and Φf.
ARIK, M, ACEMIOGLU, B, Onganer, Yavuz
openaire   +2 more sources

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
openaire   +1 more source

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 H2O, and H2O, and in the dipolar aprotic solvent, DMSO.
Leng, X.; Nguyen, N. H. van Beusekom, Wilson, D.A., Percec, V.   +6 more
openaire   +1 more source