Ion Hydration and Ion Pairing as Probed by THz Spectroscopy

2019 ◽  
Vol 58 (10) ◽  
pp. 3000-3013 ◽  
Author(s):  
Gerhard Schwaab ◽  
Federico Sebastiani ◽  
Martina Havenith
Keyword(s):  
Ion Pairing ◽  
Thz Spectroscopy ◽  
Ion Hydration

scholarly journals Selectivity in heterovalent anion exchange. Ion pairing vs. ion hydration

1972 ◽  
Vol 76 (17) ◽  
pp. 2459-2462 ◽  
Author(s):  
J. Bucher ◽  
R. M. Diamond ◽  
B. Chu
Keyword(s):  
Anion Exchange ◽  
Ion Pairing ◽  
Ion Hydration

scholarly journals Stripping away ion hydration shells in electrical double-layer formation: Water networks matter

2021 ◽  
Vol 118 (47) ◽  
pp. e2108568118
Author(s):  
Serena R. Alfarano ◽  
Simone Pezzotti ◽  
Christopher J. Stein ◽  
Zhou Lin ◽  
Federico Sebastiani ◽  
...  
Keyword(s):  
Double Layer ◽  
Hydration Shell ◽  
Thz Spectroscopy ◽  
Layer Formation ◽  
Ion Hydration ◽  
Hydration Shells ◽  
Synchrotron Light ◽  
Dynamics Simulations ◽  
Anion Hydration ◽  
Structure Calculations

The double layer at the solid/electrolyte interface is a key concept in electrochemistry. Here, we present an experimental study combined with simulations, which provides a molecular picture of the double-layer formation under applied voltage. By THz spectroscopy we are able to follow the stripping away of the cation/anion hydration shells for an NaCl electrolyte at the Au surface when decreasing/increasing the bias potential. While Na+ is attracted toward the electrode at the smallest applied negative potentials, stripping of the Cl− hydration shell is observed only at higher potential values. These phenomena are directly measured by THz spectroscopy with ultrabright synchrotron light as a source and rationalized by accompanying molecular dynamics simulations and electronic-structure calculations.

A Study of the Use of Solubility Isotherms to Obtain Information about Ion Hydration and Ion Pairing in Concentrated Solutions of Electrolytes

1994 ◽  
Vol 59 (1) ◽  
pp. 126-137 ◽  
Author(s):  
Jitka Eysseltová
Keyword(s):  
Computational Analysis ◽  
Ternary Systems ◽  
Ion Pairing ◽  
Electrolyte Solutions ◽  
Model Systems ◽  
Concentrated Solutions ◽  
Ion Hydration ◽  
Solutions Of Electrolytes ◽  
Common Ion ◽  
Solubility Isotherms

Computational analysis of solubility isotherms in ternary systems consisting of water and two solutes having a common ion was suggested and the respective software was developed. This hydration analysis was applied to model systems NH4CNS - NaCNS - H2O at 5, 25 and 50 °C and NaX - KX - H2O (X = Cl, Br, I) at 25 °C. The results obtained are discussed and the way in which the hydration analysis gives information on ionic processes in saturated electrolyte solutions is demonstrated.

Hydration of ferric chloride and nitrate in aqueous solutions: water-mediated ion pairing revealed by Raman spectroscopy

2019 ◽  
Vol 21 (35) ◽  
pp. 19172-19180
Author(s):  
Stephen M. Baumler ◽  
William H. Hartt V. ◽  
Heather C. Allen
Keyword(s):  
Raman Spectroscopy ◽  
Aqueous Solutions ◽  
Ferric Chloride ◽  
Ion Pairing ◽  
Ion Pair ◽  
Pair Formation ◽  
Ferric Ion ◽  
Ion Hydration ◽  
Ion Pair Formation

Ferric ion hydration differences are governed by ion pair formation uniquely affected by anion identity.

Ion Pairing and Dielectric Decrement in Glycosaminoglycan Brushes

2020 ◽  
Author(s):  
James Sterling ◽  
Wenjuan Jiang ◽  
Wesley M. Botello-Smith ◽  
Yun L. Luo
Keyword(s):  
Molecular Dynamics ◽  
Ion Pairs ◽  
Mean Field ◽  
Salt Bridge ◽  
Ion Pairing ◽  
Donnan Potential ◽  
Mean Field Models ◽  
Ion Exclusion ◽  
Dynamics Simulations ◽  
Contact Ion Pairs

Molecular dynamics simulations of hyaluronic acid and heparin brushes are presented that show important effects of ion-pairing, water dielectric decrease, and co-ion exclusion. Results show equilibria with electroneutrality attained through screening and pairing of brush anionic charges by cations. Most surprising is the reversal of the Donnan potential that would be expected based on electrostatic Boltzmann partitioning alone. Water dielectric decrement within the brush domain is also associated with Born hydration-driven cation exclusion from the brush. We observe that the primary partition energy attracting cations to attain brush electroneutrality is the ion-pairing or salt-bridge energy associated with cation-sulfate and cation-carboxylate solvent-separated and contact ion pairs. Potassium and sodium pairing to glycosaminoglycan carboxylates and sulfates consistently show similar abundance of contact-pairing and solvent-separated pairing. In these crowded macromolecular brushes, ion-pairing, Born-hydration, and electrostatic potential energies all contribute to attain electroneutrality and should therefore contribute in mean-field models to accurately represent brush electrostatics.

Photoisomerization-induced patterning of ion-pairing materials based on anionic azobenzene and its complex with a fluorescent π-electronic system

2021 ◽  
Vol 57 (35) ◽  
pp. 4287-4290
Author(s):  
Ryohei Yamakado ◽  
Issei Kitamura ◽  
Mitsuo Hara ◽  
Shusaku Nagano ◽  
Takahiro Seki ◽  
...  
Keyword(s):  
Surface Tension ◽  
Mass Transport ◽  
Trace Amount ◽  
Ion Pairs ◽  
Ion Pairing ◽  
Electronic System ◽  
Large Mass ◽  
System P ◽  
The Difference

Large mass transport driven by the difference in the photoisomerization-induced surface tension was demonstrated in ion pairs, enabling fluorescence patterning using a trace amount of photoisomerized anions in complexation with a π-electronic system.

Pyrrole-bridged quinones: π-electronic systems that modulate electronic structures by tautomerism and deprotonation

2021 ◽  
Author(s):  
Shinya Sugiura ◽  
Hiromitsu Maeda
Keyword(s):  
Infrared Absorption ◽  
Electronic Structures ◽  
Near Infrared ◽  
Ion Pairing ◽  
Anion Binding ◽  
Electronic Systems

A new series of π-extended quinone derivatives containing a pyrrole bridge exhibited NH/OH-type tautomerization and anion binding along with deprotonation that induced near-infrared absorption and ion-pairing assemblies.

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