Ion effects on the structure of water studied by terahertz time-domain spectroscopy

Kondoh, Masato; Ohshima, Yasuhiro; Tsubouchi, Masaaki

doi:10.1016/j.cplett.2013.11.055

Cited by 46 publications

(39 citation statements)

References 27 publications

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“…The three-Debye model, in which we vary τ D , τ 2 , τ 3 , ε 1 , ε 2 and ε ∞, achieves a significantly improved correlation coefficient relative to the two-Debye model ( Fig In addition to the two-and three-Debye models we have, for completeness, also fitted our data using a model that includes a resonant process suggested by prior authors as an important component in the femto-to-picosecond dynamics of liquid water 13,41,42 .…”

Section: Introductionmentioning

confidence: 99%

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High-precision gigahertz-to-terahertz spectroscopy of aqueous salt solutions as a probe of the femtosecond-to-picosecond dynamics of liquid water

Vinh

Sherwin

Allen

et al. 2015

The Journal of Chemical Physics

102

110

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Abstract. Because it is sensitive to fluctuations occurring over femtoseconds to picoseconds, gigahertz-to-terahertz dielectric relaxation spectroscopy can provide a valuable window into water's most rapid intermolecular motions. In response, we have built a vector network analyzer dielectric spectrometer capable of measuring absorbance and index of refraction in this frequency regime with unprecedented precision. Using this to determine the complex dielectric response of water and aqueous salt solutions from 5.9GHz to 1.12 THz (which we provide in the SI), we have obtained strong new constraints on theories of water's collective dynamics. For example, while the salt-dependencies we observe for water's two slower relaxations (8 and 1 ps) are easily reconciled with suggestions that they arise due to rotations of fully and partially hydrogen bonded molecules, respectively, the salt-dependence of the fastest relaxation (180 fs) appears difficult to reconcile with its prior assignment to liberations of single hydrogen bonds.

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Section: Introductionmentioning

confidence: 99%

“…The second is a two-Debye-plus-resonance model likewise promulgated by numerous previous authors 13,41,42 .…”

Section: Introductionmentioning

confidence: 99%

High-precision gigahertz-to-terahertz spectroscopy of aqueous salt solutions as a probe of the femtosecond-to-picosecond dynamics of liquid water

Vinh

Sherwin

Allen

et al. 2015

The Journal of Chemical Physics

102

110

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“…Signals from labile protons shift steadily upfield as the counterion is changed from sulphate to thiocyanate. While it was proved that the chemical shifts of solvent's atoms can change in the presence of ions in a manner not directly translatable to Hofmeister series rationale 24 , the solvent-mediated impact on other solutes remains in agreement with the notion that poorly solvated anions render the polar solvent less aggressive 25 (by actually allowing it to retain its typical, hydrogen-bonded structure or, in the case of DMSO, one based on other strong dipole-dipole interactions). It follows that a sufficiently selective ion-ion interaction would be visible as a deviation from the uniform changes brought about by the dominant solvent-ion interactions.…”

Section: Comparison Of 1 H Nmr Spectra Although Not Ideal In Order mentioning

confidence: 93%

Exploring ion-ion preferences through structure-property correlations: amino acid-derived, bis(guanidinium) disiloxane salts

Tabisz

Rozwadowski

Katrusiak

et al. 2020

Sci Rep

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present study that valuable information could be obtained from comparative analysis of series of compounds: complicated enough to include more than one functionality, yet simple enough to allow for differentiation of their individual impact on bulk physicochemical properties. Starting with the abovementioned lysozyme/ionic liquid behaviour discrepancy and wanting to also investigate the structuring effect of anions on the separating organic phase, we decided to synthesize amino acid-linked bis(guanidines), in which the polar moieties are separated by a siloxane bridge. This idea stemmed from a previous study, which revealed an abnormally low water solubility of the prepared 1,3-bis(3-guanidinopropyl)-t etramethyldisiloxane nitrate (parent chloride was fully water-miscible) 17. Addition of amide bonds seemed very attractive, as they often co-exist with guanidine moieties in many polypeptides and are a key ingredient in their higher-than-primary structure. Guanidines, on the other hand, have well-established "chaotropic" properties in their own right 18. Siloxane bridges, though fairly chemically and very thermally resistant, impart a strong tendency for disorganization and non-crystallinity on the molecule, which stems from the extremely low energy barrier for rotation around the Si-O bond 19. This results in most siloxanes presenting as liquids, oils or waxy solids at room temperature (a point of connection with ionic liquids). The apparent crystallinity of the abovementioned nitrate was yet another reason for choosing that particular class of compounds. Apart from the obvious advantage of easily comparable results, one of the drawbacks of articles referring to Hofmeister series as a common denominator is the limitation of studied anions to those with well-established places on that spectrum: phosphate, sulphate, halides, nitrate, perchlorate and thiocyanate. In an effort to find more subtle differences, we expanded our search. For example, while the charge density difference between sulphate and perchlorate explains why these two geometrically similar oxoanions exert significantly different influences on water solutions, we chose chromate and molybdate (same geometry and charge) instead. Azide, an ion very rarely studied in this context, was also included-due to its specific linear geometry (similar to thiocyanate) and significant electronic contribution from the characteristic − N = N + = N − resonance structure. Results and Discussion Design and synthesis. The intramolecular hydrogen bonding between amide moieties determines the

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“…Specifically, salt aqueous solution play an important role in solution chemistry and some aspects of cell and membrane biology [16,17]. In order to explain the microcosmic structure in the salts in water, there was widely experimental investigation [18][19][20][21], for example, Raman spectroscopy [22], X-ray [23], microwave relaxation spectroscopy [24][25][26][27] and neutron diffraction [28]. In the salt aqueous solution, ions cause to the hydrogen-bond network of water at the microscopic level is closely related to biological effects.…”

Section: Introductionmentioning

confidence: 99%

Non-thermal effects of microwave in sodium chloride aqueous solution: Insights from molecular dynamics simulations

Liu

Jia

2017

Journal of Molecular Liquids

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Ion effects on the structure of water studied by terahertz time-domain spectroscopy

Cited by 46 publications

References 27 publications

High-precision gigahertz-to-terahertz spectroscopy of aqueous salt solutions as a probe of the femtosecond-to-picosecond dynamics of liquid water

High-precision gigahertz-to-terahertz spectroscopy of aqueous salt solutions as a probe of the femtosecond-to-picosecond dynamics of liquid water

Exploring ion-ion preferences through structure-property correlations: amino acid-derived, bis(guanidinium) disiloxane salts

Non-thermal effects of microwave in sodium chloride aqueous solution: Insights from molecular dynamics simulations

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