Ultrafast Dynamics and Liquid Structure in Mesoporous Silica: Propagation of Surface Effects in a Polar Aprotic Solvent

2021 ◽  
Author(s):  
Samantha T. Hung ◽  
Steven A. Yamada ◽  
Weizhong Zheng ◽  
Michael D. Fayer
Keyword(s):  
Mesoporous Silica ◽  
Aprotic Solvent ◽  
Surface Effects ◽  
Liquid Structure ◽  
Ultrafast Dynamics ◽  
Polar Aprotic Solvent

Cyclic trimers of phosphinic acids in polar aprotic solvent: symmetry, chirality and H/D isotope effects on NMR chemical shifts

2018 ◽  
Vol 20 (7) ◽  
pp. 4901-4910 ◽  
Author(s):  
V. V. Mulloyarova ◽  
I. S. Giba ◽  
M. A. Kostin ◽  
G. S. Denisov ◽  
I. G. Shenderovich ◽  
...  
Keyword(s):  
Aprotic Solvent ◽  
Chemical Shifts ◽  
Isotope Effects ◽  
Nmr Chemical Shifts ◽  
Polar Aprotic Solvent ◽  
Phosphinic Acids ◽  
Proton Chemical Shifts ◽  
Bonded Complexes ◽  
Hydrogen Bonded

By using NMR in liquefied gases, the stoichiometry of hydrogen-bonded complexes is determined via H/D isotope effects on proton chemical shifts.

Solvolysis of sulphonyl halides. VIII. Reaction of methane and ethane sulphony1 chlorides with methanol, ethanol, and mixed solvent systems

1971 ◽  
Vol 24 (4) ◽  
pp. 713 ◽  
Author(s):  
R Foon ◽  
AN Hambly
Keyword(s):  
Carbon Tetrachloride ◽  
Room Temperature ◽  
Reaction Rate ◽  
Mixed Solvent ◽  
Aprotic Solvent ◽  
Excess Enthalpies ◽  
Initial State ◽  
Polar Aprotic Solvent ◽  
Rate Of Reaction ◽  
Solvent Systems

At room temperature methanesulphonyl chloride reacts more rapidly than ethanesulphonyl chloride in solvolysis by ethanol. Their rates of reaction with methanol are approximately equal while ethanesulphonyl chloride is the more reactive in hydrolysis. The enthalpies and entropies of activation have been determined for the solvolysis of ethanesulphonyl chloride in mixtures of ethanol with benzene, carbon tetrachloride, or 2,2,4-trimethylpentane. A comparison of the excess enthalpies and entropies of mixing in the formation of these solvents with the corresponding parameters for reaction shows that the effects on reaction rate are not due merely to the modification of the initial state of the system. The effect of the polar aprotic solvent nitrobenzene on the rate of reaction with methanol is attributed to an increase in the nucleophilic tendency of the methanol rather than to solvation of the reactive centre in the transition state.

Poly(vinylpyrrolidone) Coated Iron Nanoparticles in Polar Aprotic Solvent

2008 ◽  
Vol 8 (4) ◽  
pp. 2091-2095 ◽  
Author(s):  
Zhihui Ban ◽  
Brian L. Cushing ◽  
Charles J. O'Connor
Keyword(s):  
Iron Nanoparticles ◽  
Aprotic Solvent ◽  
Shell Structures ◽  
Iron Core ◽  
Capping Agent ◽  
Squid Magnetometry ◽  
X Ray ◽  
Transmission Electron ◽  
Polar Aprotic Solvent ◽  
Core Nanoparticles

Poly(vinylpyrrolidone) (PVP) coated iron nanoparticles which show well-defined core–shell structures have been successfully synthesized in a polar aprotic solvent. In this approach, PVP was employed not as capping agent, but as coating polymer directly applied to the metallic (iron) core nanoparticles. The morphologies, structures, compositions and magnetic properties of the products were investigated by transmission electron microscopy (TEM), X-ray powder diffraction (XRD), energy dispersive X-ray spectroscopy (EDXS), SQUID magnetometry and FTIR spectroscopy.

scholarly journals UV, FTIR and DFT Studies of Chlorochromones in Polar Protic and Polar Aprotic Solvent Mixtures

IARJSET ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 95-103
Author(s):  
Walmik B. Shirsath
Keyword(s):  
Aprotic Solvent ◽  
Solvent Mixtures ◽  
Dft Studies ◽  
Polar Aprotic Solvent

Oxidative Rearrangement via 1,2-Aryl Migration using Hydroxy(tosyloxy)iodobenzene in a Polar Aprotic Solvent

Synlett ◽  
2020 ◽  
Vol 31 (10) ◽  
pp. 959-964
Author(s):  
Raj Kamal ◽  
Vipan Kumar ◽  
Ravinder Kumar ◽  
Sangeeta Saini ◽  
Rajesh Kumar
Keyword(s):  
Aprotic Solvent ◽  
Unsaturated Ketones ◽  
Oxidative Rearrangement ◽  
Polar Aprotic Solvent

A series of geminal β,β-ditosyloxy ketones were synthesized in moderate to good yields through hydroxy(tosyloxy)iodobenzene-mediated ditosyloxylation of readily accessible α,β-unsaturated ketones in a polar aprotic solvent. A mechanism has been proposed for the synthesis of the geminal β,β-ditosyloxy ketones, and entails an oxidative rearrangement involving a 1,2-aryl migration.

Electrodeposition of NiO Films and Inverse Opal Organized Layers from Polar Aprotic Solvent-Based Electrolyte

2016 ◽  
Vol 219 ◽  
pp. 638-646 ◽  
Author(s):  
S. Koussi-Daoud ◽  
O. Majerus ◽  
D. Schaming ◽  
T. Pauporté
Keyword(s):  
Aprotic Solvent ◽  
Inverse Opal ◽  
Polar Aprotic Solvent ◽  
Nio Films

Preparation of defect-free asymmetric gas separation membranes with dihydrolevoglucosenone (CyreneTM) as a greener polar aprotic solvent

2021 ◽  
pp. 120173
Author(s):  
Alexander T. Bridge ◽  
Benjamin J. Pedretti ◽  
Joan F. Brennecke ◽  
Benny D. Freeman
Keyword(s):  
Gas Separation ◽  
Aprotic Solvent ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Polar Aprotic Solvent
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