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Sissaoui J, Efimov A, Kumpulainen T, Vauthey E. Photoinduced Electron Transfer in a Porphyrin-Fullerene Dyad at a Liquid Interface. J Phys Chem B 2022; 126:4723-4730. [PMID: 35727678 DOI: 10.1021/acs.jpcb.2c02405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The excited-state properties of an amphiphilic porphyrin-fullerene dyad and of its porphyrin analogue adsorbed at the dodecane/water interface are investigated by using surface second-harmonic generation. Although the porphyrin is formally centrosymmetric, the second-harmonic spectra of both compounds are dominated by the intense Soret band of the porphyrin. Polarization-selective measurements and molecular dynamics simulations suggest an angle of about 45° between the donor-acceptor axis and the interfacial plane, with the porphyrin interacting mostly with the nonpolar phase. Time-resolved measurements reveal a marked concentration dependence of the dynamics of both compounds upon Q-band excitation, indicating the occurrence of intermolecular quenching processes. The significant differences in dynamics and spectra between the dyad and the porphyrin analogue are explained by a self-quenching of the excited dyad via an intermolecular electron transfer.
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Affiliation(s)
- Jihad Sissaoui
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland
| | - Alexander Efimov
- Faculty of Engineering and Natural Sciences, Tampere University, Korkeakoulunkatu 8, 33100 Tampere, Finland
| | - Tatu Kumpulainen
- Department of Chemistry/Nanoscience Center, University of Jyväskylä, Survontie 9 C, 40014 Jyväskylä, Finland
| | - Eric Vauthey
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland
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2
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Hamkalo M, Fita P, Fedorynski M, Makosza M. Interfacial Generation of a Carbanion: The Key Step of PTC Reaction Directly Observed by Second Harmonic Generation. Chemistry 2018; 24:3975-3979. [PMID: 29383849 DOI: 10.1002/chem.201705597] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Indexed: 11/11/2022]
Abstract
We present the first unambiguous evidence of the interfacial mechanism of phase-transfer catalysis (PTC) by direct observation of the formation of carbanions in the interfacial region between the aqueous and the organic phase by using a surface-sensitive spectroscopic method known as second harmonic generation (SHG). Ion exchange of carbanions adsorbed at the surface after addition of lipophilic tetraalkylammonium salts (TAA) to organic phase and transport of the lipophilic ion-pairs to the organic phase is observed. Results allow for the formulation of a more detailed mechanism of PTC.
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Affiliation(s)
- Michal Hamkalo
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland.,Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5, 02-093, Warsaw, Poland
| | - Piotr Fita
- Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5, 02-093, Warsaw, Poland
| | - Michal Fedorynski
- Department of Chemistry, Warsaw University of Technology, 00-661, Warsaw, Poland
| | - Mieczyslaw Makosza
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
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Licari G, Beckwith JS, Soleimanpour S, Matile S, Vauthey E. Detecting order and lateral pressure at biomimetic interfaces using a mechanosensitive second-harmonic-generation probe. Phys Chem Chem Phys 2018; 20:9328-9336. [DOI: 10.1039/c8cp00773j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
A mechanosensitive harmonophore is used to probe the order and lateral pressure in phospholipid monolayers by surface-second harmonic generation.
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Affiliation(s)
- Giuseppe Licari
- Department of Physical Chemistry, University of Geneva
- CH-1211 Geneva 4
- Switzerland
| | - Joseph S. Beckwith
- Department of Physical Chemistry, University of Geneva
- CH-1211 Geneva 4
- Switzerland
| | - Saeideh Soleimanpour
- Department of Organic Chemistry, University of Geneva
- CH-1211 Geneva 4
- Switzerland
| | - Stefan Matile
- Department of Organic Chemistry, University of Geneva
- CH-1211 Geneva 4
- Switzerland
| | - Eric Vauthey
- Department of Physical Chemistry, University of Geneva
- CH-1211 Geneva 4
- Switzerland
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4
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Licari G, Cwiklik L, Jungwirth P, Vauthey E. Exploring Fluorescent Dyes at Biomimetic Interfaces with Second Harmonic Generation and Molecular Dynamics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:3373-3383. [PMID: 28314372 DOI: 10.1021/acs.langmuir.7b00403] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The adsorption of a DNA fluorescent probe belonging to the thiazole orange family at the dodecane/water and dodecane/phospholipid/water interfaces has been investigated using a combination of surface second harmonic generation (SSHG) and all-atomistic molecular dynamics (MD) simulations. Both approaches point to a high affinity of the cationic dye for the dodecane/water interface with a Gibbs free energy of adsorption on the order of -45 kJ/mol. Similar affinity was observed with a monolayer of negatively charged DPPG (1,2-dipalmitoyl-sn-glycero-3-phospho-rac-(1-glycerol)) lipids. On the other hand, no significant adsorption could be found with the zwitterionic DPPC (1,2-dipalmitoyl-sn-glycero-3-phosphocholine) lipids. This was rationalized in terms of Coulombic interactions between the monolayer surface and the cationic dye. The similar affinity for the interface with and without DPPG, despite the favorable Coulombic attraction in the latter case, could be explained after investigating the interfacial orientation of the dye. In the absence of a monolayer, the dye adsorbs with its molecular plane almost flat at the interface, whereas in the presence of DPPG it has to intercalate into the monolayer and adopt a significantly different orientation to benefit from the electrostatic stabilization.
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Affiliation(s)
- Giuseppe Licari
- Department of Physical Chemistry, University of Geneva , 30 quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
| | - Lukasz Cwiklik
- J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences , Dolejškova 2155/3, 182 23 Prague 8, Czech Republic
| | - Pavel Jungwirth
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences , Flemingovo nam. 2, 16610 Prague 6, Czech Republic
| | - Eric Vauthey
- Department of Physical Chemistry, University of Geneva , 30 quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
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5
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George C, Ammann M, D’Anna B, Donaldson DJ, Nizkorodov S. Heterogeneous photochemistry in the atmosphere. Chem Rev 2015; 115:4218-58. [PMID: 25775235 PMCID: PMC4772778 DOI: 10.1021/cr500648z] [Citation(s) in RCA: 287] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Indexed: 02/06/2023]
Affiliation(s)
- Christian George
- Université
de Lyon 1, Lyon F-69626, France
- CNRS, UMR5256,
IRCELYON, Institut de Recherches sur la Catalyse et
l’Environnement de Lyon, Villeurbanne F-69626, France
| | - Markus Ammann
- Laboratory
of Radiochemistry and Environmental Chemistry, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Barbara D’Anna
- Université
de Lyon 1, Lyon F-69626, France
- CNRS, UMR5256,
IRCELYON, Institut de Recherches sur la Catalyse et
l’Environnement de Lyon, Villeurbanne F-69626, France
| | - D. J. Donaldson
- Department
of Chemistry and Department of Physical & Environmental Sciences, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Sergey
A. Nizkorodov
- Department
of Chemistry, University of California, Irvine, California 92697, United States
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Svechkarev D, Kolodezny D, Mosquera-Vázquez S, Vauthey E. Complementary surface second harmonic generation and molecular dynamics investigation of the orientation of organic dyes at a liquid/liquid interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:13869-13876. [PMID: 25393042 DOI: 10.1021/la503121g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The second-order nonlinear response of two dyes adsorbed at the dodecane/water interface was investigated by surface second harmonic generation (SSHG). These dyes consist of the same chromophoric unit, 2-pyridinyl-5-phenyloxazole, with an alkyl chain located at the two opposite ends. The analysis of the polarization dependence of the SSHG intensity as usually performed points to similar tilt angles of the two dyes with respect to the interface but does not give information on the absolute direction. Molecular dynamics (MD) simulations reveal that both dyes lie almost flat at the interface but have opposite orientations. A refined SSHG data analysis with the width of the orientational distribution yields tilt angles that are in very satisfactory agreement with the MD simulations.
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Affiliation(s)
- Denis Svechkarev
- Department of Physical Chemistry, University of Geneva , 30 quai Ernest-Ansermet, 1211 Geneva, Switzerland
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Richert S, Mosquera Vazquez S, Grzybowski M, Gryko DT, Kyrychenko A, Vauthey E. Excited-State Dynamics of an Environment-Sensitive Push–Pull Diketopyrrolopyrrole: Major Differences between the Bulk Solution Phase and the Dodecane/Water Interface. J Phys Chem B 2014; 118:9952-63. [DOI: 10.1021/jp506062j] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Sabine Richert
- Department
of Physical Chemistry, University of Geneva, 30 quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
| | - Sandra Mosquera Vazquez
- Department
of Physical Chemistry, University of Geneva, 30 quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
| | - Marek Grzybowski
- Institute of Organic Chemistry of the Polish Academy of Sciences, 01-224 Warsaw, Poland
| | - Daniel T. Gryko
- Institute of Organic Chemistry of the Polish Academy of Sciences, 01-224 Warsaw, Poland
| | - Alexander Kyrychenko
- V. N. Karazin Kharkiv National University, 4 Svobody Square, Kharkiv 61022, Ukraine
| | - Eric Vauthey
- Department
of Physical Chemistry, University of Geneva, 30 quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
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Fedoseeva M, Letrun R, Vauthey E. Excited-State Dynamics of Rhodamine 6G in Aqueous Solution and at the Dodecane/Water Interface. J Phys Chem B 2014; 118:5184-93. [DOI: 10.1021/jp502058e] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Marina Fedoseeva
- Department
of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, Geneva, Switzerland
| | - Romain Letrun
- Department
of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, Geneva, Switzerland
| | - Eric Vauthey
- Department
of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, Geneva, Switzerland
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Fedoseeva M, Fita P, Vauthey E. Excited-state dynamics of charged dyes at alkane/water interfaces in the presence of salts and ionic surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:14865-14872. [PMID: 24245476 DOI: 10.1021/la402191p] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The excited-state dynamics of the cationic dye malachite green (MG) and of the dianionic dye eosin B at the dodecane/water interface has been investigated using femtosecond time-resolved surface second harmonic generation (TR-SSHG). By using different probe wavelengths, the contributions of monomeric and aggregated MG to the signal could be spectroscopically distinguished. The effect of the addition of a small amount of surfactants was found to strongly depend on the relative charges of surfactant and dye. For surfactant/dye pairs with opposite charges, the TR-SSHG signal is dominated by the contribution from aggregates, whereas for pairs with the same charges, the signal intensity becomes vanishingly small. These effects are explained in terms of electrostatic interactions between surfactants and dyes that favor either attraction of the dye toward the interface or its repulsion toward the bulk. As a very similar behavior is observed with MG upon addition of NaSCN, we conclude that, in this case, this effect reflects the affinity of SCN¯ for the interface. On the other hand, the guanidinium cation was found to have a different effect than that of a positively charged surfactant on the SSHG signal of MG, indicating this cation does not accumulate in the interfacial region.
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Affiliation(s)
- Marina Fedoseeva
- Department of Physical Chemistry, University of Geneva , 30 Quai Ernest-Ansermet, Geneva, Switzerland
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Beierlein FR, Krause AM, Jäger CM, Fita P, Vauthey E, Clark T. Molecular dynamics simulations of liquid phase interfaces: understanding the structure of the glycerol/water-dodecane system. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:11898-11907. [PMID: 23980615 DOI: 10.1021/la4021355] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Modern spectroscopic techniques such as time-resolved second-harmonic-generation spectroscopy allow molecules to be examined selectively directly at phase interfaces. Two-phase systems formed by glycerol/water and alkane layers have previously been studied by time-resolved second-harmonic-generation spectroscopic measurements. In this molecular dynamics study, a triphenylmethane dye was inserted at the glycerol/water-alkane interface and was used as a probe for local properties such as viscosity. We now show how extensive simulations over a wide range of concentrations can be used to obtain a detailed view of the molecular structure at the glycerol/water-alkane interface. Glycerol is accumulated in a double layer adjacent to the alkane interface, which results in increased viscosity of the glycerol/water phase in the direct vicinity of the interface. We also show that conformational ensembles created by classical molecular-dynamics simulations can serve as input for QM/MM calculations, yielding further information such as transition dipoles, which can be compared with spectroscopic measurements.
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Affiliation(s)
- Frank R Beierlein
- Computer-Chemie-Centrum and Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg , Nägelsbachstr. 25, 91052 Erlangen, Germany
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11
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Zwier TS. Photoinduced Dynamics in Membranes and at Interfaces. J Phys Chem Lett 2012; 3:1721. [PMID: 26285735 DOI: 10.1021/jz300645m] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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