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Oka K, Shibue T, Sugimura N, Watabe Y, Tanaka M, Winther-Jensen B, Nishide H. Two States of Water Converge to One State below 215 K. J Phys Chem Lett 2021; 12:5802-5806. [PMID: 34137615 DOI: 10.1021/acs.jpclett.1c01132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Anomalies of water have been explained by the two-state water model. In the model, water becomes one state upon supercooling. However, water crystallizes completely below 235 K ("no man's land"). The structural origin of the anomalous of the water is hidden in the "no man's land". To understand the properties of water, the spectroscopic experiment in "Norman's land" is inevitable. Hence, we proposed a new soft-confinement method for standard nuclear magnetic resonance spectroscopy to explore the "no man's land". We found the singularity temperature (215 K) at ambient pressure. Water exists in one state below 215 K. Above 215 K, the two states of water are supercritical states of the liquid-liquid critical point. The current study provides a perspective to determine the liquid-liquid critical point of water existing in a high-pressure condition.
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Affiliation(s)
- Kouki Oka
- Department of Applied Chemistry and Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan
| | - Toshimichi Shibue
- Materials Characterization Central Laboratory, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan
| | - Natsuhiko Sugimura
- Materials Characterization Central Laboratory, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan
| | - Yuki Watabe
- Materials Characterization Central Laboratory, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan
| | - Midori Tanaka
- Materials Characterization Central Laboratory, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan
| | - Bjorn Winther-Jensen
- Department of Applied Chemistry and Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan
- Fortescue Metals Group Ltd., Level 2, 87 Adelaide Terrace East, Perth, WA 6004, Australia
| | - Hiroyuki Nishide
- Department of Applied Chemistry and Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan
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2
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Oka K, Shibue T, Sugimura N, Watabe Y, Winther-Jensen B, Nishide H. Nonpolar Water Clusters: Proton Nuclear Magnetic Resonance Spectroscopic Evidence for Transformation from Polar Water to Nonpolar Water Clusters in Liquid State. J Phys Chem Lett 2021; 12:276-279. [PMID: 33337164 DOI: 10.1021/acs.jpclett.0c02646] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The hydrophilic/hydrophobic interactions of water are important in biological and chemical self-assembly phenomena. Water clusters in hydrophobic environments exhibit a unique morphology. Their process of formation and nonpolar properties have been extensively studied, but no direct experimental evidence has been available until now. This study provides spectroscopic evidence for the transformation of water to nonpolar configuration via clustering. Although individual water molecules form hydrogen bonds with the hydroxyl protons of n-hexanol when codissolved in a nonpolar solvent (toluene-d8), the water clusters are comprised solely of hydrogen bonds between water molecules and do not form hydrogen bonds with the hydroxyl protons of n-hexanol. This behavior indicates that the water clusters are nonpolar rather than polar. This study reports the first example of nonpolar water configuration produced via a liquid-state clustering. This property is a common and important interfacial phenomenon of water in chemistry, biology, materials science, geology, and meteorology.
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Affiliation(s)
- Kouki Oka
- Department of Applied Chemistry and Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan
| | - Toshimichi Shibue
- Materials Characterization Central Laboratory, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan
| | - Natsuhiko Sugimura
- Materials Characterization Central Laboratory, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan
| | - Yuki Watabe
- Materials Characterization Central Laboratory, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan
| | - Bjorn Winther-Jensen
- Department of Applied Chemistry and Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan
| | - Hiroyuki Nishide
- Department of Applied Chemistry and Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan
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3
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Wang H, Shibue T, Komine H. Hydration and dehydration of water of bentonite: A solid-state 1H magic-angle spinning NMR study. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2020.110796] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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4
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Casabianca LB. Calculating nuclear magnetic resonance chemical shifts in solvated systems. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2020; 58:611-624. [PMID: 31916612 DOI: 10.1002/mrc.4994] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 12/30/2019] [Accepted: 01/02/2020] [Indexed: 06/10/2023]
Abstract
The nuclear magnetic resonance (NMR) chemical shift is extremely sensitive to molecular geometry, hydrogen bonding, solvent, temperature, pH, and concentration. Calculated magnetic shielding constants, converted to chemical shifts, can be valuable aids in NMR peak assignment and can also give detailed information about molecular geometry and intermolecular effects. Calculating chemical shifts in solution is complicated by the need to include solvent effects and conformational averaging. Here, we review the current state of NMR chemical shift calculations in solution, beginning with an introduction to the theory of calculating magnetic shielding in general, then covering methods for inclusion of solvent effects and conformational averaging, and finally discussing examples of applications using calculated chemical shifts to gain detailed structural information.
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Affiliation(s)
- Leah B Casabianca
- Department of Chemistry, Clemson University, Clemson, South Carolina
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5
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Graham TR, Pope DJ, Ghadar Y, Clark S, Clark A, Saunders SR. Alcohol Clustering Mechanisms in Supercritical Carbon Dioxide Using Pulsed-Field Gradient, Diffusion NMR and Network Analysis: Feedback on Stepwise Self-Association Models. J Phys Chem B 2019; 123:5316-5323. [DOI: 10.1021/acs.jpcb.9b02305] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Flores ME, Shibue T, Sugimura N, Nishide H, Moreno-Villoslada I. Aggregation Number in Water/n-Hexanol Molecular Clusters Formed in Cyclohexane at Different Water/n-Hexanol/Cyclohexane Compositions Calculated by Titration 1H NMR. J Phys Chem B 2017; 121:10285-10291. [DOI: 10.1021/acs.jpcb.7b08848] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mario E. Flores
- Instituto
de Ciencias Químicas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia 52017, Chile
| | | | | | | | - Ignacio Moreno-Villoslada
- Instituto
de Ciencias Químicas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia 52017, Chile
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7
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Shahraki S, Heydari A. Binding forces between a novel Schiff base palladium(II) complex and two carrier proteins: human serum albumi and β-lactoglobulin. J Biomol Struct Dyn 2017; 36:2807-2821. [PMID: 28812944 DOI: 10.1080/07391102.2017.1367723] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Ligand binding studies on carrier proteins are crucial in determining the pharmacological properties of drug candidates. Here, a new palladium(II) complex was synthesized and characterized. The in vitro binding studies of this complex with two carrier proteins, human serum albumin (HSA), and β-lactoglobulin (βLG) were investigated by employing biophysical techniques as well as computational modeling. The experimental results showed that the Pd(II) complex interacted with two carrier proteins with moderate binding affinity (Kb ≈ .5 × 104 M-1 for HSA and .2 × 103 M-1 for βLG). Binding of Pd(II) complex to HSA and βLG caused strong fluorescence quenching of both proteins through static quenching mechanism. In two studied systems hydrogen bonds and van der Waals forces were the major stabilizing forces in the drug-protein complex formation. UV-Visible and FT-IR measurements indicated that the binding of above complex to HSA and βLG may induce conformational and micro-environmental changes of two proteins. Protein-ligand docking analysis confirmed that the Pd(II) complex binds to residues located in the subdomain IIA of HSA and site A of βLG. All these experimental and computational results suggest that βLG and HSA might act as carrier protein for Pd(II) complex to deliver it to the target molecules.
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Key Words
- Ala, Alanine
- Cys, Cysteine
- DFT, Density Functional Theory
- DMSO, Dimethyl sulfoxide
- HOMO, highest occupied molecular orbital
- HSA, Human Serum Albumin
- LUMO, lowest unoccupied molecular orbital
- Leu, Leucine
- Lys, Lysine
- NMR, Nuclear Magnetic Resonance
- Pd(II) complex
- Pro, Proline
- Schiff base
- TMS, Tetramethylsilane
- Trp, Tryptophan
- Tyr, Tyrosine
- Val, Valine
- human serum albumin
- protein interactions
- β-lactoglobulin
- βLG, β-lactoglobulin
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Affiliation(s)
- Somaye Shahraki
- a Department of Chemistry , University of Zabol , Zabol , Iran
| | - Ali Heydari
- b Department of Chemistry , University of Sistan and Baluchestan , Zahedan , Iran
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Flores ME, Martínez F, Olea AF, Shibue T, Sugimura N, Nishide H, Moreno-Villoslada I. Water-Induced Phase Transition in Cyclohexane/n-Hexanol/Triton X-100 Mixtures at a Molar Composition of 1/16/74 Studied by NMR. J Phys Chem B 2017; 121:876-882. [DOI: 10.1021/acs.jpcb.6b11752] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Mario E. Flores
- Departamento
de Ciencia de los Materiales, Facultad de Ciencias Físicas
y Matemáticas, Universidad de Chile, Avenida Tupper 2069, Santiago 8370451, Chile
- Instituto
de Ciencias Químicas, Facultad de Ciencias, Universidad Austral de Chile, Las Encinas 220, Valdivia 5090000, Chile
| | - Francisco Martínez
- Departamento
de Ciencia de los Materiales, Facultad de Ciencias Físicas
y Matemáticas, Universidad de Chile, Avenida Tupper 2069, Santiago 8370451, Chile
| | - Andrés F. Olea
- Instituto
de Ciencias Químicas Aplicadas, Facultad de Ingeniería, Universidad Autónoma de Chile, El Llano Subercaseaux 2801, Santiago 8320325, Chile
| | - Toshimichi Shibue
- Material
Characterization Central Laboratory, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Natsuhiko Sugimura
- Material
Characterization Central Laboratory, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Hiroyuki Nishide
- Department
of Applied Chemistry, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Ignacio Moreno-Villoslada
- Instituto
de Ciencias Químicas, Facultad de Ciencias, Universidad Austral de Chile, Las Encinas 220, Valdivia 5090000, Chile
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