Results 221 to 230 of about 8,250 (257)

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
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New protic salts of aprotic polar solvents

Tetrahedron Letters, 2004
Abstract Aprotic polar solvents such as DMF, acetonitrile or DMSO can be protonated to form stable triflate salts when treated with triflic acid. The reaction of the same solvents with N , N -bis(trifluoromethanesulfonyl)imide led to the isolation of the corresponding N , N -bis(trifluoromethanesulfonyl)imide salts.
Isabelle Favier, Elisabet Duñach
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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
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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
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Solvation properties of protic ionic liquid–molecular solvent mixtures

Physical Chemistry Chemical Physics, 2020
In this study, we have investigated the solvation properties of binary mixtures of PILs with molecular solvents. The selected binary solvent systems are the PILs ethylammonium nitrate (EAN) and propylammonium nitrate (PAN) combined with either water, methanol, acetonitrile or DMSO.
Dilek Yalcin, Andrew J. Christofferson, Calum J. Drummond, Tamar L. Greaves   +3 more
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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
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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
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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
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Neutral Nazarov reaction using protic solvents as activators

Bulletin of the Chemical Society of Japan, 2023
Abstract Herein, we report a neutral Nazarov reaction using protic solvents instead of strong acids as activators. The key to the success of this reaction lies in the rational design of the divinyl ketone substrates. In particular, the introduction of electron-donating groups (EDGs) at the β- and β′-positions of the carbonyl group in the
Takayuki Iwata, Shingo Funatsu, Kohei Kajiwara, Yoshihito Shiota, Kazunari Yoshizawa, Mitsuru Shindo   +5 more
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Polyglycerol‐Tagged Molecular Clips as Receptors in Protic Solvents

European Journal of Organic Chemistry, 2012
AbstractFour charge‐neutral molecular clips modified with polyglycerol (PG) dendrons of first and second generation and with hyperbranched polyglycerols (HPG) in the central unit as solubilizing units were synthesized. Their use as supramolecular hosts for the complexation of several guest molecules such as caffeine, N‐methylnicotinamide iodide, and ...
Zieringer, Maximilian, Casas Cartagena, Marçal, Burakowska, Ewelina, Taktikos, Johannes, Neuthe, Katja, Bandmann, Heinz, Klärner, Frank-Gerrit, Haag, Rainer   +7 more
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