scholarly journals Dielectric response of light, heavy and heavy-oxygen water: isotope effects on the hydrogen-bonding network's collective relaxation dynamics

2021 ◽  
Vol 23 (9) ◽  
pp. 5467-5473
Author(s):  
Bence Kutus ◽  
Andrey Shalit ◽  
Peter Hamm ◽  
Johannes Hunger
Keyword(s):  
Hydrogen Bonding ◽  
Dielectric Relaxation ◽  
Dielectric Response ◽  
Isotope Effects ◽  
Relaxation Dynamics ◽  
Mass Effects ◽  
Relaxation Experiments ◽  
Mass Factor ◽  
Water Isotope

Dielectric relaxation experiments on light, heavy-, and heavy-oxygen water reveal that classical mass effects on the reorientational relaxation of water can be accounted for by a translational mass factor.

scholarly journals NMR of Natural Products as Potential Drugs

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3763
Author(s):  
Poul Erik Hansen
Keyword(s):  
Natural Products ◽  
Hydrogen Bonding ◽  
Density Functional ◽  
Chemical Shifts ◽  
Isotope Effects ◽  
Density Functional Theory Calculations ◽  
Intramolecular Hydrogen Bonding ◽  
Chemical Equilibria ◽  
Nmr Techniques ◽  
Intramolecular Hydrogen

This review outlines methods to investigate the structure of natural products with emphasis on intramolecular hydrogen bonding, tautomerism and ionic structures using NMR techniques. The focus is on 1H chemical shifts, isotope effects on chemical shifts and diffusion ordered spectroscopy. In addition, density functional theory calculations are performed to support NMR results. The review demonstrates how hydrogen bonding may lead to specific structures and how chemical equilibria, as well as tautomeric equilibria and ionic structures, can be detected. All these features are important for biological activity and a prerequisite for correct docking experiments and future use as drugs.

High Frequency Dielectric Response of the Ionic Liquid N-Methyl-N-ethylpyrrolidinium Dicyanamide

2007 ◽  
Vol 60 (1) ◽  
pp. 6 ◽  
Author(s):  
Simon Schrödle ◽  
Gary Annat ◽  
Douglas R. MacFarlane ◽  
Maria Forsyth ◽  
Richard Buchner ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Dielectric Loss ◽  
Dielectric Relaxation ◽  
High Frequency ◽  
Dielectric Response ◽  
Room Temperature ◽  
Room Temperature Ionic Liquid ◽  
Dielectric Relaxation Spectroscopy ◽  
Frequency Range ◽  
Fast Rotation

A study of the room-temperature ionic liquid N-methyl-N-ethylpyrrolidinium dicyanamide by dielectric relaxation spectroscopy over the frequency range 0.2 GHz ≤ ν ≤ 89 GHz has revealed that, in addition to the already known lower frequency processes, there is a broad featureless dielectric loss at higher frequencies. The latter is probably due to the translational (oscillatory) motions of the dipolar ions of the IL relative to each other, with additional contributions from their fast rotation.

scholarly journals Jonscher indices for dielectric materials

2019 ◽  
Vol 09 (06) ◽  
pp. 1950046
Author(s):  
C. L. Wang
Keyword(s):  
Experimental Data ◽  
Asymptotic Behavior ◽  
Dielectric Relaxation ◽  
Time Domain ◽  
Dielectric Response ◽  
Relaxation Function ◽  
Dielectric Materials ◽  
Dielectric Response Function ◽  
Barium Stannate ◽  
Two Parameters

Two parameters are proposed as Jonscher indices, named after A. K. Jonscher for his pioneering contribution to the universal dielectric relaxation law. Time domain universal dielectric relaxation law is then obtained from the asymptotic behavior of dielectric response function and relaxation function by replacing parameters in Mittag–Leffler functions with Jonscher indices. Relaxation types can be easily determined from experimental data of discharge current in barium stannate titanate after their Jonscher indices are determined.

Dielectric relaxation and dielectric response mechanism in (Li, Ti)-doped NiO ceramics

2008 ◽  
Vol 20 (39) ◽  
pp. 395227 ◽  
Author(s):  
Prasit Thongbai ◽  
Suwat Tangwancharoen ◽  
Teerapon Yamwong ◽  
Santi Maensiri
Keyword(s):  
Dielectric Relaxation ◽  
Dielectric Response ◽  
Response Mechanism

Isotope Effects on Hydrogen Bonding and CH/CD−π Interaction

2018 ◽  
Vol 122 (26) ◽  
pp. 15026-15032 ◽  
Author(s):  
Eisuke Kanao ◽  
Takuya Kubo ◽  
Toyohiro Naito ◽  
Takatoshi Matsumoto ◽  
Tomoharu Sano ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Isotope Effects

Polaronic conduction and dielectric relaxation dynamics in V2O5 added lead bismuth silicate glass system

2020 ◽  
Vol 528 ◽  
pp. 119746 ◽  
Author(s):  
T. Annapurna ◽  
M. Kostrzewa ◽  
A. Siva Sesha Reddy ◽  
A. Ingram ◽  
J. Ashok ◽  
...  
Keyword(s):  
Dielectric Relaxation ◽  
Silicate Glass ◽  
Glass System ◽  
Relaxation Dynamics ◽  
Bismuth Silicate
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