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Hashimoto K, Kobayashi Y, Kokubo H, Ueki T, Ohara K, Fujii K, Watanabe M. Solvation Structure of Poly(benzyl methacrylate) in a Solvate Ionic Liquid: Preferential Solvation of Li-Glyme Complex Cation. J Phys Chem B 2019; 123:4098-4107. [PMID: 31009222 DOI: 10.1021/acs.jpcb.9b02458] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the solvation structure of a lower critical solution temperature (LCST)-type thermoresponsive polymer in a solvate ionic liquid (SIL, i.e., an ionic liquid comprising solvate ions) to elucidate the predominant interaction for the dissolution of the thermoresponsive polymer in SIL at low temperatures. The solvation structure of poly(benzyl methacrylate) (PBnMA) and a model compound of its monomer in a typical glyme-based SIL, [Li(G4)][TFSA] (G4: tetraglyme; TFSA: bis(trifluoromethanesulfonyl)amide), have been investigated using high-energy X-ray total scattering and all-atom molecular dynamics simulations. In the model compound/SIL system, the intermolecular components extracted from the total G( r)s revealed that the ester moiety of BnMA is preferentially solvated by Li cations through a cation-dipole interaction, which induces slight desolvation of the G4 molecules, and the aromatic ring of BnMA is secondarily solvated by the [Li(G4)] cation complex through a cation-π interaction with maintaining the complex structure. In contrast, TFSA anions are attracted only by the [Li(G4)] cation. These interactions result in the formation of a solvation layer of SILs around the aromatic ring, which plays a key role in the negative entropy and enthalpy of mixing. Meanwhile, in the polymer solution, the coordination number of the Li cation around the ester moiety significantly decreased. This could be ascribed to the steric effect of the bulky side chains, preventing the approach of the [Li(G4)] cation complex to the ester moiety located near the main chain. These solvation structures lead to small absolute values of negative entropy and enthalpy of mixing, which together are key factors to understand the LCST-type phase behavior in the IL system.
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Affiliation(s)
- Kei Hashimoto
- Department of Chemistry and Biotechnology , Yokohama National University , 79-5 Tokiwadai , Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Yumi Kobayashi
- Department of Chemistry and Biotechnology , Yokohama National University , 79-5 Tokiwadai , Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Hisashi Kokubo
- Department of Chemistry and Biotechnology , Yokohama National University , 79-5 Tokiwadai , Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Takeshi Ueki
- WPI Research Center International Center for Materials Nanoarchitectonics (WPI-MANA) , National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - Koji Ohara
- Japan Synchrotron Radiation Research Institute (JASRI) , 1-1-1 Koto, Sayocho , Sayogun , Hyogo 679-5198 , Japan
| | - Kenta Fujii
- Graduate School of Sciences and Technology for Innovation , Yamaguchi University , 2-16-1 Tokiwadai , Ube , Yamaguchi 755-8611 , Japan
| | - Masayoshi Watanabe
- Department of Chemistry and Biotechnology , Yokohama National University , 79-5 Tokiwadai , Hodogaya-ku, Yokohama 240-8501 , Japan
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Arifin, Yokogawa D, Schnupf U, Irle S. Statistical Mechanics-Based Theoretical Investigation of Solvation Effects on Glucose Anomer Preferences. J Phys Chem B 2018; 122:290-296. [PMID: 29271652 DOI: 10.1021/acs.jpcb.7b10270] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The importance of solvation effects on the stability of glucose anomers has been studied by the combination of quantum mechanics and statistical mechanics, namely, the reference interaction site model self-consistent field spatial electron density distribution. The preferences of α- and β-glucose in H2O are well reproduced with the obtained ratio of 35:65 for α- and β-glucose, respectively. Indirect interactions and bulk effects, described by the Onsager model, are relatively small compared to the direct solute-solvent interactions, especially in [DMIM]Cl and dimethyl sulfoxide. From the decomposition of solvation free energy and solvation structures, it can be seen that the interactions with the solvent molecules greatly contribute to the anomer preferences.
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Affiliation(s)
- Arifin
- Department of Chemistry, Graduate School of Science, Nagoya University , Chikusa, Nagoya 464-8601, Japan.,Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University , Chikusa, Nagoya 464-8602, Japan
| | - Daisuke Yokogawa
- Department of Chemistry, Graduate School of Science, Nagoya University , Chikusa, Nagoya 464-8601, Japan.,Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University , Chikusa, Nagoya 464-8602, Japan
| | - Udo Schnupf
- Mund-Lagowski Department of Chemistry & Biochemistry, Bradley University , Peoria 61625, Illinois, United States
| | - Stephan Irle
- Department of Chemistry, Graduate School of Science, Nagoya University , Chikusa, Nagoya 464-8601, Japan.,Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University , Chikusa, Nagoya 464-8602, Japan
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3
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Solvation free energy of solvation of biomass model cellobiose molecule: A molecular dynamics analysis. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.06.083] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Hirosawa K, Fujii K, Hashimoto K, Shibayama M. Solvated Structure of Cellulose in a Phosphonate-Based Ionic Liquid. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01138] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Kazu Hirosawa
- Institute
for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Kenta Fujii
- Graduate
School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai,
Ube, Yamaguchi 755-8611, Japan
| | - Kei Hashimoto
- Department
of Chemistry and Biotechnology, Yokohama National University, 79-5 Tokiwadai,
Hodogaya-ku, Yokohama 240-8501, Japan
| | - Mitsuhiro Shibayama
- Institute
for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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Fujii K, Ueki T, Hashimoto K, Kobayashi Y, Kitazawa Y, Hirosawa K, Matsugami M, Ohara K, Watanabe M, Shibayama M. Microscopic Structure of Solvated Poly(benzyl methacrylate) in an Imidazolium-Based Ionic Liquid: High-Energy X-ray Total Scattering and All-Atom MD Simulation Study. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00840] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Kenta Fujii
- Graduate
School of Sciences and Technology for Innovation, Yamaguchi University, 1-16-2 Tokiwadai, Ube, Yamaguchi 755-8611, Japan
| | - Takeshi Ueki
- National Institute
for Materials Science, 1-1 Namiki, Tsukuba-city, Ibaraki 305-0044, Japan
| | - Kei Hashimoto
- Department of Chemistry & Biotechnology, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Kanagawa 240-8501, Japan
| | - Yumi Kobayashi
- Department of Chemistry & Biotechnology, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Kanagawa 240-8501, Japan
| | - Yuzo Kitazawa
- Department of Chemistry & Biotechnology, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Kanagawa 240-8501, Japan
| | - Kazu Hirosawa
- Institute
for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Masaru Matsugami
- Faculty
of Liberal Studies, National Institute of Technology, Kumamoto College, 2659-2 Suya, Koshi, Kumamoto 861-1102, Japan
| | - Koji Ohara
- Japan Synchrotron
Radiation
Institute (JASRI), Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Masayoshi Watanabe
- Department of Chemistry & Biotechnology, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Kanagawa 240-8501, Japan
| | - Mitsuhiro Shibayama
- Institute
for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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