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Honegger P, Steinhauser O, Schröder C. Collective Spectroscopy of Solvation Phenomena: Conflicts, Challenges, and Opportunities. J Phys Chem Lett 2023; 14:609-618. [PMID: 36634000 DOI: 10.1021/acs.jpclett.2c03574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Different spectroscopy types reveal different aspects of molecular processes in soft matter. In particular, collective observables can provide insights into intermolecular correlations invisible to the more popular single-particle methods. In this perspective we feature the dielectric relaxation spectroscopy (DRS) with an emphasis on the proper interpretation of this complex observable aided by computational spectroscopy. While we focus on the history and recent advances of DRS in the fields of biomolecular hydration and nanoconfinement, the discussion transcends this particular field and provides a guide for how collective spectroscopy types supported by computational decomposition can be employed to further our understanding of soft matter phenomena.
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Affiliation(s)
- Philipp Honegger
- University of Vienna,Faculty of Chemistry, Department of Computational Biological Chemistry, Wien, 1090, Austria
- Department of Systems Biology, Harvard Medical School, 200 Longwood Avenue, BostonMassachusetts02115, United States
| | - Othmar Steinhauser
- University of Vienna,Faculty of Chemistry, Department of Computational Biological Chemistry, Wien, 1090, Austria
| | - Christian Schröder
- University of Vienna,Faculty of Chemistry, Department of Computational Biological Chemistry, Wien, 1090, Austria
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2
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Sofronov O, Bakker HJ. Slow Proton Transfer in Nanoconfined Water. ACS CENTRAL SCIENCE 2020; 6:1150-1158. [PMID: 32724849 PMCID: PMC7379388 DOI: 10.1021/acscentsci.0c00340] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Indexed: 06/11/2023]
Abstract
The transport of protons in nanoconfined environments, such as in nanochannels of biological or artificial proton conductive membranes, is essential to chemistry, biology, and nanotechnology. In water, proton diffusion occurs by hopping of protons between water molecules. This process involves the rearrangement of many hydrogen bonds and as such can be strongly affected by nanoconfinement. We study the vibrational and structural dynamics of hydrated protons in water nanodroplets stabilized by a cationic surfactant using polarization-resolved femtosecond infrared transient absorption spectroscopy. We determine the time scale of proton hopping in the center of the water nanodroplets from the dynamics of the anisotropy of the transient absorption signals. We find that in small nanodroplets with a diameter <4 nm, proton hopping is more than 10 times slower than in bulk water. Even in relatively large nanodroplets with a diameter of ∼7 nm, we find that the rate of proton hopping is slowed by ∼4 times compared with bulk water.
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3
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Honegger P, Heid E, Schröder C, Steinhauser O. Dielectric spectroscopy and time dependent Stokes shift: two faces of the same coin? Phys Chem Chem Phys 2020; 22:18388-18399. [DOI: 10.1039/d0cp02840a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Different types of spectroscopy capture different aspects of dynamics and different ranges of intermolecular contributions.
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Affiliation(s)
- Philipp Honegger
- University of Vienna
- Faculty of Chemistry
- Department of Computational Biological Chemistry
- 1090 Vienna
- Austria
| | - Esther Heid
- University of Vienna
- Faculty of Chemistry
- Department of Computational Biological Chemistry
- 1090 Vienna
- Austria
| | - Christian Schröder
- University of Vienna
- Faculty of Chemistry
- Department of Computational Biological Chemistry
- 1090 Vienna
- Austria
| | - Othmar Steinhauser
- University of Vienna
- Faculty of Chemistry
- Department of Computational Biological Chemistry
- 1090 Vienna
- Austria
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4
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Breynaert E, Houlleberghs M, Radhakrishnan S, Grübel G, Taulelle F, Martens JA. Water as a tuneable solvent: a perspective. Chem Soc Rev 2020; 49:2557-2569. [DOI: 10.1039/c9cs00545e] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Water is the most sustainable solvent, but its polarity limits the solubility of non-polar solutes. Confining water in hydrophobic nanopores could be a way to modulate water solvent properties and enable using water as tuneable solvent (WaTuSo).
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Affiliation(s)
- Eric Breynaert
- KU Leuven, Centre for Surface Chemistry and Catalysis – Characterization and Application Team (COK-KAT)
- B-3001 Heverlee
- Belgium
- Center for Molecular Water Science (CMWS)
- 22607 Hamburg
| | - Maarten Houlleberghs
- KU Leuven, Centre for Surface Chemistry and Catalysis – Characterization and Application Team (COK-KAT)
- B-3001 Heverlee
- Belgium
| | - Sambhu Radhakrishnan
- KU Leuven, Centre for Surface Chemistry and Catalysis – Characterization and Application Team (COK-KAT)
- B-3001 Heverlee
- Belgium
| | - Gerhard Grübel
- Deutsches Elektronen-Synchrotron DESY
- 22607 Hamburg
- Germany
- Center for Molecular Water Science (CMWS)
- 22607 Hamburg
| | - Francis Taulelle
- KU Leuven, Centre for Surface Chemistry and Catalysis – Characterization and Application Team (COK-KAT)
- B-3001 Heverlee
- Belgium
| | - Johan A. Martens
- KU Leuven, Centre for Surface Chemistry and Catalysis – Characterization and Application Team (COK-KAT)
- B-3001 Heverlee
- Belgium
- Center for Molecular Water Science (CMWS)
- 22607 Hamburg
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5
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Ensing B, Tiwari A, Tros M, Hunger J, Domingos SR, Pérez C, Smits G, Bonn M, Bonn D, Woutersen S. On the origin of the extremely different solubilities of polyethers in water. Nat Commun 2019; 10:2893. [PMID: 31253797 PMCID: PMC6599002 DOI: 10.1038/s41467-019-10783-z] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 05/21/2019] [Indexed: 11/09/2022] Open
Abstract
The solubilities of polyethers are surprisingly counter-intuitive. The best-known example is the difference between polyethylene glycol ([-CH2-CH2-O-]n) which is infinitely soluble, and polyoxymethylene ([-CH2-O-]n) which is completely insoluble in water, exactly the opposite of what one expects from the C/O ratios of these molecules. Similar anomalies exist for oligomeric and cyclic polyethers. To solve this apparent mystery, we use femtosecond vibrational and GHz dielectric spectroscopy with complementary ab initio calculations and molecular dynamics simulations. We find that the dynamics of water molecules solvating polyethers is fundamentally different depending on their C/O composition. The ab initio calculations and simulations show that this is not because of steric effects (as is commonly believed), but because the partial charge on the O atoms depends on the number of C atoms by which they are separated. Our results thus show that inductive effects can have a major impact on aqueous solubilities.
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Affiliation(s)
- Bernd Ensing
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands.
| | - Ambuj Tiwari
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Martijn Tros
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Johannes Hunger
- Max Planck Institute for Polymer Research, Department of Molecular spectroscopy, Ackermannweg 10, 55128, Mainz, Germany.
| | - Sérgio R Domingos
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - Cristóbal Pérez
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - Gertien Smits
- Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Department of Molecular spectroscopy, Ackermannweg 10, 55128, Mainz, Germany.
| | - Daniel Bonn
- Institute of Physics, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Sander Woutersen
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands.
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Bunkin NF, Shkirin AV, Kozlov VA, Ninham BW, Uspenskaya EV, Gudkov SV. Near-surface structure of Nafion in deuterated water. J Chem Phys 2018; 149:164901. [PMID: 30384746 DOI: 10.1063/1.5042065] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The swelling of a polymer ion-exchange membrane Nafion in water with various heavy isotope contents (D2O) was studied by photoluminescent UV spectroscopy. The photoluminescence arises because of the presence of sulfonic groups attached to the ends of the perfluorovinyl ether groups that form the tetrafluoroethylene (Teflon) backbone of Nafion. The width of the colloidal region, which is formed near the membrane surface as a result of the outgrowth of Nafion microfibers toward the bulk liquid, varies non-monotonically with D2O content, displaying a narrow maximum in the low concentration region. A significant insight into the unexpected isotopic effects revealed in swelling Nafion in deuterated water is provided. Mainly, the polymer swelling is very sensitive to small changes (on the order of several tens of parts per million) in the content of deuterium, which, for instance, can help in understanding the isotopic effects in living tissues.
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Affiliation(s)
- N F Bunkin
- Bauman Moscow State Technical University, Second Baumanskaya Str. 5, Moscow 105005, Russia
| | - A V Shkirin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilova Str. 38, Moscow 119991, Russia
| | - V A Kozlov
- Bauman Moscow State Technical University, Second Baumanskaya Str. 5, Moscow 105005, Russia
| | - B W Ninham
- The Australian National University, Acton, ACT 2601, Australia
| | - E V Uspenskaya
- RUDN University, Miklukho-Maklaya Str. 6, Moscow 117198, Russia
| | - S V Gudkov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilova Str. 38, Moscow 119991, Russia
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7
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Picosecond orientational dynamics of water in living cells. Nat Commun 2017; 8:904. [PMID: 29026086 PMCID: PMC5714959 DOI: 10.1038/s41467-017-00858-0] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 08/01/2017] [Indexed: 11/18/2022] Open
Abstract
Cells are extremely crowded, and a central question in biology is how this affects the intracellular water. Here, we use ultrafast vibrational spectroscopy and dielectric-relaxation spectroscopy to observe the random orientational motion of water molecules inside living cells of three prototypical organisms: Escherichia coli, Saccharomyces cerevisiae (yeast), and spores of Bacillus subtilis. In all three organisms, most of the intracellular water exhibits the same random orientational motion as neat water (characteristic time constants ~9 and ~2 ps for the first-order and second-order orientational correlation functions), whereas a smaller fraction exhibits slower orientational dynamics. The fraction of slow intracellular water varies between organisms, ranging from ~20% in E. coli to ~45% in B. subtilis spores. Comparison with the water dynamics observed in solutions mimicking the chemical composition of (parts of) the cytosol shows that the slow water is bound mostly to proteins, and to a lesser extent to other biomolecules and ions. The cytoplasm’s crowdedness leads one to expect that cell water is different from bulk water. By measuring the rotational motion of water molecules in living cells, Tros et al. find that apart from a small fraction of water solvating biomolecules, cell water has the same dynamics as bulk water.
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van der Loop TH, Ottosson N, Vad T, Sager WFC, Bakker HJ, Woutersen S. Communication: Slow proton-charge diffusion in nanoconfined water. J Chem Phys 2017; 146:131101. [DOI: 10.1063/1.4979714] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Tibert H. van der Loop
- Van ’t Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Niklas Ottosson
- FOM Institute for Atomic and Molecular Physics, Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - Thomas Vad
- Institut für Textiltechnik, RWTH Aachen University, Otto-Blumenthal-Strasse 1, 52074 Aachen, Germany
| | - Wiebke F. C. Sager
- Peter Grünberg Institute, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Huib J. Bakker
- FOM Institute for Atomic and Molecular Physics, Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - Sander Woutersen
- Van ’t Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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9
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Hande VR, Chakrabarty S. Exploration of the presence of bulk-like water in AOT reverse micelles and water-in-oil nanodroplets: the role of charged interfaces, confinement size and properties of water. Phys Chem Chem Phys 2016; 18:21767-79. [DOI: 10.1039/c6cp04378j] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We show that the distance from the interface at which bulk-like properties are recovered strongly depends on the choice of order parameter being probed: translational < tetrahedral ≪ dipolar orientation.
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Affiliation(s)
- Vrushali R. Hande
- Physical and Materials Chemistry Division
- CSIR-National Chemical Laboratory
- Pune-411008
- India
| | - Suman Chakrabarty
- Physical and Materials Chemistry Division
- CSIR-National Chemical Laboratory
- Pune-411008
- India
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