Reduction in mesoscopic structural fluctuations of liquid water induced by the large amphiphilicity of ionic liquid cations

Morita, Takeshi; Yonenaga, Kazuki; Nitta, Ayako; Shibuta, Satoshi; Nishikawa, Keiko

doi:10.1016/j.molliq.2018.09.100

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…However, macroscopic parameters fail to mirror the microscopic properties of solvent structures. Numerous studies explore the microscopic solution structures of binary systems in reality. ,− The selective interaction between solutes and solvent components might alter the microscopic solvent structure, inducing phase separation on a microscopic scale . To decipher the microscopic structure of the water-glycerol binary system containing [Ru(bpy) 3 ] 2+ , we conducted infrared (IR) spectroscopy using the attenuated total reflection method.…”

Section: Resultsmentioning

confidence: 99%

Elucidating the Quenching Mechanism of Tris(2,2′-bipyridyl)ruthenium(II) Complex in the Water–Glycerol Binary System Based on the Microscopic Structure of the Media

Hamano,

Inagawa,

Otsuka

et al. 2024

J. Phys. Chem. B

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Kinetic studies on the photochemical quenching reaction of the tris(2,2′-bipyridyl) ruthenium(II) complex ([Ru(bpy) 3 ] 2+ ) in water-glycerol binary media were conducted based on the Einstein−Smoluchowski (E-S) theory. Dynamic and static quenching behaviors were analyzed by comparing results from time-resolved spectroscopy and emission spectroscopy. While the dynamic quenching reaction aligns well with the E-S theory, static quenching was observed, leading to a notable increase in the overall photoquenching reaction rate constant. Employing chromatography and infrared spectroscopy, we correlated the microscopic molecular structure of the binary solvent system and the solvation environment around the emitters with the reaction mechanism. This correlation was found to correspond to ion pair formation and the confinement effect of the emitter, respectively.

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Section: Resultsmentioning

confidence: 99%

Elucidating the Quenching Mechanism of Tris(2,2′-bipyridyl)ruthenium(II) Complex in the Water–Glycerol Binary System Based on the Microscopic Structure of the Media

Hamano,

Inagawa,

Otsuka

et al. 2024

J. Phys. Chem. B

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Kinetic study on bimolecular photochemical quenching of tris(2,2′-bipyridyl)ruthenium(II) complex in water–ethylene glycol binary media

Hamano,

Otsuka,

Higashiguchi

et al. 2024

ANAL. SCI.

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The Solution Chemistry of Mixing States Probed via Fluctuations: a Direct Description of Inhomogeneity in Mixing

Nishikawa

2021

Bulletin of the Chemical Society of Japan

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Radial distribution functions are commonly used to represent the structures of solutions, which represent the probability of finding another atom in the shell at a distance r from the atom of interest. This method has been used to study the structures of many non-crystalline materials. However, the information gained in this method is microscopic, and is limited to the first or second nearest neighbors from the featured atom. The present author proposed a completely different method to describe the solution structure by expressing the inhomogeneity in distribution of atoms and molecules and in concentration as “density fluctuation” and “concentration fluctuation”, respectively; namely the structure of a solution is described in terms of the “mixing state” or “mixing scheme.” This paper introduces density fluctuation and concentration fluctuation, as well as Kirkwood-Buff Integrals. Fluctuations of solutions become more pronounced in the mesoscale region. The relationship with solution thermodynamics, which represents the macroscopic limit, is also discussed. The features and cautions of experiments to measure the fluctuations are described. Finally, as analytical examples, temperature and concentration dependences of mixing schemes for two solution systems with upper critical and lower critical solution temperatures are presented.

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Reduction in mesoscopic structural fluctuations of liquid water induced by the large amphiphilicity of ionic liquid cations

Cited by 3 publications

References 32 publications

Elucidating the Quenching Mechanism of Tris(2,2′-bipyridyl)ruthenium(II) Complex in the Water–Glycerol Binary System Based on the Microscopic Structure of the Media

Elucidating the Quenching Mechanism of Tris(2,2′-bipyridyl)ruthenium(II) Complex in the Water–Glycerol Binary System Based on the Microscopic Structure of the Media

Kinetic study on bimolecular photochemical quenching of tris(2,2′-bipyridyl)ruthenium(II) complex in water–ethylene glycol binary media

The Solution Chemistry of Mixing States Probed via Fluctuations: a Direct Description of Inhomogeneity in Mixing

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