Results 191 to 200 of about 10,116 (242)

Nucleofugality and Nucleophilicity of Fluoride in Protic Solvents

The Journal of Organic Chemistry, 2012
A series of p-substituted benzhydryl fluorides (diarylfluoromethanes) were prepared and subjected to solvolysis reactions, which were followed conductometrically. The observed first-order rate constants k(1)(25 °C) were found to follow the correlation equation log k(1)(25 °C) = s(f)(N(f) + E(f)), which allowed us to determine the nucleofuge-specific ...
Christoph, Nolte, Johannes, Ammer, Herbert, Mayr   +2 more
openaire   +2 more sources

The fate of phosphobetaines in protic solvents

Journal of the Chemical Society D: Chemical Communications, 1971
Reactions in protic solvents of 2-hydroxyalkyltriphenylphosphonium salts with base and of triphenylphosphine with propylene oxide produce numerous unexpected products, thereby revealing a much wider scope of reactivity for the phosphobetaine intermediates of these reactions than was previously recognized.
J. W. Rakshys, S. V. McKinley
openaire   +1 more source

Anion solvation in protic solvents

Journal of the Chemical Society, Chemical Communications, 1977
Spectroscopic evidence is advanced in favour of the concept of continuous hydrogen-bonding from anions into bulk solvent with no intervention of an intermediate structureless region.
Susan E. Jackson, Imants M. Strauss, Martyn C. R. Symons   +2 more
openaire   +1 more source

Products of Degradation of Black Phosphorus in Protic Solvents

ACS Nano, 2018
Deterioration of the surface of black phosphorus (BP) caused by ambient atmosphere is an undesired process, limiting broader use of BP in many areas. The mechanism of BP degradation was explained theoretically, and the oxidized materials were thoroughly characterized experimentally.
Jan Plutnar, Zdeněk Sofer, Martin Pumera   +2 more
openaire   +2 more sources

Photophysical properties of safranine O in protic solvents

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2004
Spectroscopic and photophysical properties of safranine O (Sf) were investigated in binary water/solvent mixtures. It was found that these properties are strongly solvent-dependent. A blue shift is observed for both the ground-state absorption and the triplet-triplet main absorption band when the solvent polarity augments.
María L, Gómez, Carlos M, Previtali, Hernán A, Montejano   +2 more
openaire   +2 more sources

Photochemistry of 5-aminoquinoline in protic and aprotic solvents

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011
Photophysical properties of 5-aminoquinoline (5AQ) have been investigated in various non-polar and polar (protic and aprotic) solvents using steady state and time resolved fluorescence. In aprotic solvents, the spectral maxima depend on the polarity. However, in protic solvents both the fluorescence intensity as well decay time show decrease depending ...
Jagat P, Bridhkoti, Hirdyesh, Mishra, H C, Joshi, Sanjay, Pant   +3 more
openaire   +2 more sources

PHOTOCHEMISTRY OF 1,2-DIPHENYLCYCLOBUTENE IN PROTIC SOLVENTS

Chemistry Letters, 1974
Abstract Irradiation of 1,2-diphenylcyclobutene (1) in methanol solution afforded a mixture of α-(1-phenylcyclopropyl)benzyl methyl ether and 1,2-diphenylcyclobutyl methyl ether. In acetic acid corresponding esters were obtained. Evidence supporting the involvement of a singlet species was obtained by the finding that the fluorescence of
Masako Sakuragi, Masaki Hasegawa
openaire   +1 more source

Rotational diffusion in aprotic and protic solvents

Chemical Physics, 1978
Abstract We present the orientational relaxation times in protic and aprotic solvents for rose bengal in its lowest excited singlet state. The method uses a mode locked dye laser for polarized excitation, and time correlated single photon counting for determination of the time resolved polarized fluorescence.
Kenneth G. Spears, Laurence E. Cramer
openaire   +1 more source

Selective Recognition of Alkyl Pyranosides in Protic and Aprotic Solvents

Journal of the American Chemical Society, 2008
The design and synthesis of receptors capable of selective, noncovalent recognition of carbohydrates continues to be a signature challenge in bioorganic chemistry. We report a new generation of tripodal receptors incorporating three pyridine (compound 2) or quinoline (compound 3) rings around a central cyclohexane core for use in molecular recognition ...
Prakash B, Palde, Peter C, Gareiss, Benjamin L, Miller   +2 more
openaire   +2 more sources

Solvation properties of protic ionic liquids and molecular solvents

Physical Chemistry Chemical Physics, 2020
Ionic liquids (ILs) are highly tailorable solvents with many potential applications. Knowledge about their solvation properties is highly beneficial in the utilization of ILs for specific tasks, though for many ILs this is currently unknown.
Dilek Yalcin, Calum J. Drummond, Tamar L. Greaves   +2 more
openaire   +2 more sources