Results 31 to 40 of about 10,338 (283)

Nucleofugality and Nucleophilicity of Fluoride in Protic Solvents [PDF]

open access: yes, 2016
A series of p-substituted benzhydryl fluorides (diarylfluoromethanes) were prepared and subjected to solvolysis reactions, which were followed conductometrically.
Johannes Ammer (1353501)   +2 more
core   +1 more source

Polarity-Dependent Twisted Intramolecular Charge Transfer in Diethylamino Coumarin Revealed by Ultrafast Spectroscopy

open access: yesChemosensors, 2022
Twisting intramolecular charge transfer (TICT) is a common nonradiative relaxation pathway for a molecule with a flexible substituent, effectively reducing the fluorescence quantum yield (FQY) by swift twisting motions.
Jiawei Liu, Cheng Chen, Chong Fang
doaj   +1 more source

Functionalized Oxatriquinanes and Their Structural Equilibrium in Protic Solvent

open access: yesChemical and Pharmaceutical Bulletin, 2014
We synthesized oxatriquinane hexafluorophosphate bearing an ethoxycarbonylmethyl group 7 or a 2-oxopropyl group 11. Both of these organic oxonium cation compounds were obtained as stable solids. However, (1)H-NMR analysis showed that oxatriquinane 7 was present as the oxonium cation in aprotic solvent CD₃CN, but was in rapid equilibrium with ring ...
Suzuki, Hideyuki, Muratake, Hideaki
openaire   +3 more sources

Influence of Swelling Media on the Crystallinity and Accessibility of Lyocell Fibers: An FTIR and 13C NMR Analysis

open access: yesJournal of Natural Fibers, 2022
Cellulose swelling using different protic, aprotic and alkaline solvents, which are capable of penetrating crystalline parts of cellulose is one of the important methods to enhance the accessibility and, as a result, the reactivity of cellulose in ...
Fereshteh Fadavi   +3 more
doaj   +1 more source

Dissociation constants of some substituted cinnamic acids in protic solvents: measurements by hyper-Rayleigh scattering and potentiometric techniques [PDF]

open access: yes, 1996
Recently, we have demonstrated [J. Phys. Chem. 99 (1995) 17891] that dissociation constants of weak organic acids in protic solvents can be measured by the recently revived hyper-Rayleigh scattering technique.
Munichandraiah, N.   +2 more
core   +3 more sources

Assisted dipeptide bond formation: glycine as a case study

open access: yesHeliyon, 2021
Peptide bond formation is a crucial chemical process that dominates most biological mechanisms and is claimed to be a governing factor in the origin of life.
Sofiene Achour   +3 more
doaj   +1 more source

Ultrafast Excited-State Dynamics of Hydrogen-Bonded Cytosine Microsolvated Clusters with Protic and Aprotic Polar Solvents [PDF]

open access: yes, 2018
Microsolvation effects on the ultrafast excited-state deactivation dynamics of cytosine (Cy) were studied in hydrogen-bonded Cy clusters with protic and aprotic solvents using mass-resolved femtosecond pump–probe ionization spectroscopy.
Hung-Chien Yen   +17 more
core   +1 more source

Evaluation of solvents’ effect on solubility, intermolecular interaction energies and habit of ascorbic acid crystals

open access: yesJournal of Saudi Chemical Society, 2019
Solubility of active pharmaceutical ingredient (API) in solvents is very important for drug development and manufacturing. Solubility data may provide further information such as thermochemical properties and intermolecular interactions that may lead to ...
S. Hassan   +3 more
doaj   +1 more source

Utilization of the dye N-methyl-6-oxyquinolone as an optical acidometer in molecular solvents and protic ionic liquids [PDF]

open access: yes, 2017
We developed a procedure to use the highly sensitive dyeN-methyl-6-oxyquinolone as an acidity probe in molecular solvents and protic ionic liquids.
Stella Schmode, Ralf Ludwig
core   +1 more source

Dissociation constants of weak organic acids in protic solvents obtained from their first hyperpolarizabilities in solution [PDF]

open access: yes, 1995
The first hyperpolarizabilities (beta) of some weak aromatic organic acids have been measured in protic solvents by the hyper-Rayleigh scattering (HRS) technique at low concentrations.
Ray, Paresh Chandra, Das, Puspendu Kumar
core   +1 more source

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