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Strazdaite S, Versluis J, Ottosson N, Bakker HJ. Correction to "Orientation of Methylguanidinium Ions at the Water-Air Interface". J Phys Chem C Nanomater Interfaces 2017; 121:27774. [PMID: 31305773 PMCID: PMC5734589 DOI: 10.1021/acs.jpcc.7b11099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
[This corrects the article DOI: 10.1021/acs.jpcc.7b03752.].
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Strazdaite S, Versluis J, Ottosson N, Bakker HJ. Orientation of Methylguanidinium Ions at the Water-Air Interface. J Phys Chem C Nanomater Interfaces 2017; 121:23398-23405. [PMID: 29129985 PMCID: PMC5677249 DOI: 10.1021/acs.jpcc.7b03752] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 09/13/2017] [Indexed: 06/07/2023]
Abstract
We use heterodyne-detected vibrational sum-frequency generation (HD-VSFG) to determine the orientation of the molecular plane of methylguanidinium ions at the surface of aqueous solutions. We measure the VSFG response of the symmetric and antisymmetric methyl stretch vibrations of the methylguanidinium ion with different polarization combinations. We find that for at least 50% of the methylguanidinium ions the molecular plane is at an angle >20° with respect to the surface plane. Hence, for only a minor fraction of the ions does the molecular plane have an orientation (near-)parallel to the surface plane, in contrast to the predictions of recent molecular dynamics simulation studies.
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Affiliation(s)
- S. Strazdaite
- Institute for
Atomic and Molecular Physics AMOLF, Science Park 102, Amsterdam 1098 XG, The Netherlands
| | - J. Versluis
- Institute for
Atomic and Molecular Physics AMOLF, Science Park 102, Amsterdam 1098 XG, The Netherlands
| | - N. Ottosson
- Institute for
Atomic and Molecular Physics AMOLF, Science Park 102, Amsterdam 1098 XG, The Netherlands
- Advanced Research
Center for Nanolithography ARCNL, Science
Park 110, Amsterdam 1098
XG, The Netherlands
| | - Huib J. Bakker
- Institute for
Atomic and Molecular Physics AMOLF, Science Park 102, Amsterdam 1098 XG, The Netherlands
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Ottosson N, Liu L, Bakker HJ. Vibrational Relaxation of the Aqueous Proton in Acetonitrile: Ultrafast Cluster Cooling and Vibrational Predissociation. J Phys Chem B 2016; 120:7154-63. [PMID: 27333302 DOI: 10.1021/acs.jpcb.6b02799] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We study the ultrafast O-H stretch vibrational relaxation dynamics of protonated water clusters embedded in a matrix of deuterated acetonitrile, using polarization-resolved mid-IR femtosecond spectroscopy. The clusters are produced by mixing triflic (trifluoromethanesulfonic) acid and H2O in molar ratios of 1:1, 1:2, and 1:3, thus varying the degree of hydration of the proton. At all hydration levels the excited O-H stretch vibration of the hydrated proton shows an ultrafast vibrational relaxation with a time constant T1 < 100 fs, leading to an ultrafast local heating of the protonated water cluster. This excess thermal energy, initially highly localized to the region of the excited proton, first re-distributes over the aqueous cluster and then dissipates into the surrounding acetonitrile matrix. For clusters with a triflic acid to H2O ratio of 1:3 these processes occur with time constants of 320 ± 20 fs and 1.4 ± 0.1 ps, respectively. The cooling of the clusters reveals a long-living, underlying transient absorption change with high anisotropy. We argue that this feature stems from the vibrational predissociation of a small fraction of the proton hydration structures, directly following the ultrafast infrared excitation.
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Affiliation(s)
- N Ottosson
- FOM Institute AMOLF , Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - L Liu
- FOM Institute AMOLF , Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - H J Bakker
- FOM Institute AMOLF , Science Park 104, 1098 XG Amsterdam, The Netherlands
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Ottosson N, Pastorczak M, van der Post ST, Bakker HJ. Conformation of the neurotransmitter γ-aminobutyric acid in liquid water. Phys Chem Chem Phys 2014; 16:10433-7. [DOI: 10.1039/c4cp00671b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A combined dielectric and mid-IR pump–probe spectroscopic study reveals zwitterionic GABA to exist in predominately extended conformations in liquid water.
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Affiliation(s)
- N. Ottosson
- FOM Institute AMOLF
- 1098 XG Amsterdam, The Netherlands
| | - M. Pastorczak
- FOM Institute AMOLF
- 1098 XG Amsterdam, The Netherlands
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Pokapanich W, Ottosson N, Svensson S, Ohrwall G, Winter B, Björneholm O. Bond Breaking, Electron Pushing, and Proton Pulling: Active and Passive Roles in the Interaction between Aqueous Ions and Water as Manifested in the O 1s Auger Decay. J Phys Chem B 2011; 116:3-8. [PMID: 22107172 DOI: 10.1021/jp2041247] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- W Pokapanich
- Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
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Öhrwall G, Ottosson N, Pokapanich W, Legendre S, Svensson S, Björneholm O. Charge Dependence of Solvent-Mediated Intermolecular Coster−Kronig Decay Dynamics of Aqueous Ions. J Phys Chem B 2010; 114:17057-61. [DOI: 10.1021/jp108956v] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- G. Öhrwall
- MAX-lab, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden, and Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - N. Ottosson
- MAX-lab, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden, and Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - W. Pokapanich
- MAX-lab, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden, and Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - S. Legendre
- MAX-lab, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden, and Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - S. Svensson
- MAX-lab, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden, and Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - O. Björneholm
- MAX-lab, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden, and Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
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