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Thomaz JE, Kramer PL, Fica-Contreras SM, Hoffman DJ, Fayer MD. Reorientation-induced Stokes shifts caused by directional interactions in electronic spectroscopy: Fast dynamics of poly(methyl methacrylate). J Chem Phys 2019; 150:194201. [PMID: 31117782 DOI: 10.1063/1.5094806] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Dynamic Stokes shift measurements report on structural relaxation, driven by a dipole created in a chromophore by its excitation from the ground electronic state to the S1 state. Here, we demonstrate that it is also possible to have an additional contribution from orientational relaxation of the Stokes shift chromophore. This effect, called reorientation-induced Stokes shift (RISS), can be observed when the reorientation of the chromophore and the solvent structural relaxation occur on similar time scales. Through a vector interaction, the electronic transition of the chromophore couples to its environment. The orientational diffusive motions of the chromophores will have a slight bias toward reducing the transition energy (red shift) as do the solvent structural diffusive motions. RISS is manifested in the polarization-dependence of the fluorescence Stokes shift using coumarin 153 (C153) in poly(methyl methacrylate) (PMMA). A similar phenomenon, reorientation-induced spectral diffusion (RISD), has been observed and theoretically explicated in the context of two dimensional infrared (2D IR) experiments. Here, we generalize the existing RISD theory to include properties of electronic transitions that generally are not present in vibrational transitions. Expressions are derived that permit determination of the structural dynamics by accounting for the RISS contributions. Using these generalized equations, the structural dynamics of the medium can be measured for any system in which the directional interaction is well represented by a first order Stark effect and RISS or RISD is observed. The theoretical results are applied to the PMMA data, and the structural dynamics are obtained and discussed.
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Affiliation(s)
- Joseph E Thomaz
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | - Patrick L Kramer
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | | | - David J Hoffman
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | - Michael D Fayer
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
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2
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Heid E, Hunt PA, Schröder C. Evaluating excited state atomic polarizabilities of chromophores. Phys Chem Chem Phys 2018. [PMID: 29542743 PMCID: PMC5885803 DOI: 10.1039/c7cp08549d] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Ground and excited state atomic polarizabilities of the chromophores N-methyl-6-oxyquinolinium betaine and coumarin 153 have been evaluated via quantum mechanics.
Ground and excited state dipoles and polarizabilities of the chromophores N-methyl-6-oxyquinolinium betaine (MQ) and coumarin 153 (C153) in solution have been evaluated using time-dependent density functional theory (TD-DFT). A method for determining the atomic polarizabilities has been developed; the molecular dipole has been decomposed into atomic charge transfer and polarizability terms, and variation in the presence of an electric field has been used to evaluate atomic polarizabilities. On excitation, MQ undergoes very site-specific changes in polarizability while C153 shows significantly less variation. We also conclude that MQ cannot be adequately described by standard atomic polarizabilities based on atomic number and hybridization state. Changes in the molecular polarizability of MQ (on excitation) are not representative of the local site-specific changes in atomic polarizability, thus the overall molecular polarizability ratio does not provide a good approximation for local atom-specific polarizability changes on excitation. Accurate excited state force fields are needed for computer simulation of solvation dynamics. The chromophores considered in this study are often used as molecular probes. The methods and data reported here can be used for the construction of polarizable ground and excited state force fields. Atomic and molecular polarizabilities (ground and excited states) have been evaluated over a range of functionals and basis sets. Different mechanisms for including solvation effects have been examined; using a polarizable continuum model, explicit solvation and via sampling of clusters extracted from a MD simulation. A range of different solvents have also been considered.
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Affiliation(s)
- Esther Heid
- University of Vienna, Faculty of Chemistry, Department of Computational Biological Chemistry, Währingerstraße 19, A-1090 Vienna, Austria.
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Mukherjee K, Barman A, Biswas R. Impact of the aggregation behaviour of sodium cholate and sodium deoxycholate on aqueous solution structure and dynamics: A combined time resolved fluorescence and dielectric relaxation spectroscopic study. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.07.053] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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4
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Study of Microheterogeneity in Acetonitrile-Water Binary Mixtures by using Polarity-Resolved Solvation Dynamics. Chemphyschem 2015; 16:3518-26. [DOI: 10.1002/cphc.201500663] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Indexed: 11/07/2022]
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5
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Koley S, Kaur H, Ghosh S. Probe dependent anomalies in the solvation dynamics of coumarin dyes in dimethyl sulfoxide–glycerol binary solvent: confirming the local environments are different for coumarin dyes. Phys Chem Chem Phys 2014; 16:22352-63. [DOI: 10.1039/c4cp03525a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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6
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Kaur H, Koley S, Ghosh S. Probe Dependent Solvation Dynamics Study in a Microscopically Immiscible Dimethyl Sulfoxide–Glycerol Binary Solvent. J Phys Chem B 2014; 118:7577-7585. [DOI: 10.1021/jp502003x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Harveen Kaur
- School of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar 751 005, India
| | - Somnath Koley
- School of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar 751 005, India
| | - Subhadip Ghosh
- School of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar 751 005, India
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7
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Elola MD, Rodriguez J. Solvation of Coumarin 480 within nano-confining environments: structure and dynamics. J Chem Phys 2014; 140:034702. [PMID: 25669402 DOI: 10.1063/1.4861586] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Equilibrium and dynamical characteristics pertaining to the solvation of the fluorescent probe Coumarin 480 within different confining environments are investigated using molecular dynamics simulations. Three kinds of confining systems are examined: (i) the cetyltrimethylammonium bromide (CTAB)/isooctane/1-hexanol/water; cationic inverse micelle (IM) (ii) a CTAB/water direct micelle (DM), and (iii) a silica-surfactant nanocomposite, comprising a cylindrical silica pore (SP) containing small amounts of water and CTAB species adsorbed at the pore walls. The solvation structures in the three environments differ at a qualitative level: an exchange between bulk- and interface-like solvation states was found in the IM, whereas in the DM, the solvation states of the probe are characterized by its embedding at the interface, trapped among the surfactant heads and tails. Within the SP structure, the coumarin exhibits alternations between internal and interfacial solvation states that occur on a ∼20 ns time scale and operate via 90° rotations of its molecular plane. The solvation responses of the environment following a vertical excitation of the probe are also investigated. Solvation times resulted between 2 and 1000 times longer than those found in bulk water, with a fast-to-slow trend IM→DM→SP, which can be interpreted in terms of the solvation structures that prevail in each case.
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Affiliation(s)
- M Dolores Elola
- Departamento de Física, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429 Buenos Aires, Argentina
| | - Javier Rodriguez
- Departamento de Física, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429 Buenos Aires, Argentina
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8
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Sun X, Stratt RM. The molecular underpinnings of a solute-pump/solvent-probe spectroscopy: the theory of polarizability response spectra and an application to preferential solvation. Phys Chem Chem Phys 2012; 14:6320-31. [DOI: 10.1039/c2cp24127g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Basilevsky M, Odinokov A, Nikitina E, Petrov N. The dielectric continuum solvent model adapted for treating preferential solvation effects. J Electroanal Chem (Lausanne) 2011. [DOI: 10.1016/j.jelechem.2010.09.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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10
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George SJ, Tomović Ž, Schenning APHJ, Meijer EW. Insight into the chiral induction in supramolecular stacks through preferential chiral solvation. Chem Commun (Camb) 2011; 47:3451-3. [DOI: 10.1039/c0cc04617e] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Nguyen CN, Stratt RM. Preferential solvation dynamics in liquids: How geodesic pathways through the potential energy landscape reveal mechanistic details about solute relaxation in liquids. J Chem Phys 2010; 133:124503. [DOI: 10.1063/1.3481655] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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12
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Shim Y, Kim HJ. MD Study of Solvation in the Mixture of a Room-Temperature Ionic Liquid and CO2. J Phys Chem B 2010; 114:10160-70. [DOI: 10.1021/jp105021b] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Youngseon Shim
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, Department of Chemistry, Seoul National University, Seoul 151-747, Korea, and School of Computational Sciences, Korea Institute for Advanced Study, Seoul 130-722, Korea
| | - Hyung J. Kim
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, Department of Chemistry, Seoul National University, Seoul 151-747, Korea, and School of Computational Sciences, Korea Institute for Advanced Study, Seoul 130-722, Korea
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13
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Xu J, Wang QD, Zhu Q, Fu KX, He FC, Li XY. Time-Dependent Stokes Shift from Solvent Dielectric Relaxation. CHINESE J CHEM PHYS 2010. [DOI: 10.1088/1674-0068/23/03/297-302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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14
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Basilevsky M, Odinokov A, Nikitina E, Grigoriev F, Petrov N, Alfimov M. Preferential solvation of spherical ions in binary DMSO/benzene mixtures. J Chem Phys 2009; 130:024504. [DOI: 10.1063/1.3010707] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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Swalina C, Arzhantsev S, Li H, Maroncelli M. Solvation and Solvatochromism in CO2-Expanded Liquids. 3. The Dynamics of Nonspecific Preferential Solvation. J Phys Chem B 2008; 112:14959-70. [DOI: 10.1021/jp805620q] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chet Swalina
- Department of Chemistry, Penn State University, 104 Chemistry Building, University Park, Pennsylvania 16802
| | - Sergei Arzhantsev
- Department of Chemistry, Penn State University, 104 Chemistry Building, University Park, Pennsylvania 16802
| | - Hongping Li
- Department of Chemistry, Penn State University, 104 Chemistry Building, University Park, Pennsylvania 16802
| | - Mark Maroncelli
- Department of Chemistry, Penn State University, 104 Chemistry Building, University Park, Pennsylvania 16802
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Singh PK, Nath S, Bhasikuttan AC, Kumbhakar M, Mohanty J, Sarkar SK, Mukherjee T, Pal H. Effect of donor orientation on ultrafast intermolecular electron transfer in coumarin-amine systems. J Chem Phys 2008; 129:114504. [DOI: 10.1063/1.2975192] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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17
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Rodriguez J, Martí J, Guàrdia E, Laria D. Exploring the Picosecond Time Domain of the Solvation Dynamics of Coumarin 153 within β-Cyclodextrins. J Phys Chem B 2008; 112:8990-8. [DOI: 10.1021/jp8023765] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Javier Rodriguez
- Departamento de Física, Comisión Nacional de Energia Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina, Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departament de Fısica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, B4-B5 Campus Nord 08034, Barcelona, Spain
| | - Jordi Martí
- Departamento de Física, Comisión Nacional de Energia Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina, Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departament de Fısica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, B4-B5 Campus Nord 08034, Barcelona, Spain
| | - Elvira Guàrdia
- Departamento de Física, Comisión Nacional de Energia Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina, Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departament de Fısica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, B4-B5 Campus Nord 08034, Barcelona, Spain
| | - Daniel Laria
- Departamento de Física, Comisión Nacional de Energia Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina, Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departament de Fısica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, B4-B5 Campus Nord 08034, Barcelona, Spain
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18
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Tiwari S, Shukla PK, Mishra PC. Improved electrostatic properties using combined Mulliken and hybridization-displaced charges for radicals. J Mol Model 2008; 14:631-40. [DOI: 10.1007/s00894-008-0308-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2008] [Accepted: 03/26/2008] [Indexed: 11/29/2022]
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19
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Tiftickjian CN, Egorov SA. Absorption and emission lineshapes and solvation dynamics of NO in supercritical Ar. J Chem Phys 2008; 128:114501. [PMID: 18361585 DOI: 10.1063/1.2840348] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
We perform a theoretical study of electronic spectroscopy of dilute NO in supercritical Ar fluid. Absorption and emission lineshapes for the A(2)Sigma(+)<--X(2)Pi Rydberg transition of NO in argon have been previously measured and simulated, which yielded results for the NO/Ar ground- and excited-state pair potentials [Larregaray et al., Chem. Phys. 308, 13 (2005)]. Using these potentials, we have performed molecular dynamics simulations and theoretical statistical mechanical calculations of absorption and emission lineshapes and nonequilibrium solvation correlation functions for a wide range of solvent densities and temperatures. Theory was shown to be in good agreement with simulation. Linear response treatment of solvation dynamics was shown to break down at near-critical temperature due to dramatic change in the solute-solvent microstructure upon solute excitation to the Rydberg state and the concomitant increase of the solute size.
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20
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Pradhan T, Ghoshal P, Biswas R. Excited State Intramolecular Charge Transfer Reaction in Binary Mixtures of Water and Tertiary Butanol (TBA): Alcohol Mole Fraction Dependence. J Phys Chem A 2008; 112:915-24. [DOI: 10.1021/jp0770460] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Tuhin Pradhan
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India
| | - Piue Ghoshal
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India
| | - Ranjit Biswas
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India
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Sýkora J, Slavícek P, Jungwirth P, Barucha J, Hof M. Time-dependent stokes shifts of fluorescent dyes in the hydrophobic backbone region of a phospholipid bilayer: combination of fluorescence spectroscopy and ab initio calculations. J Phys Chem B 2007; 111:5869-77. [PMID: 17488002 DOI: 10.1021/jp0719255] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We explored the time-dependent Stokes shifts of fluorescent dyes containing an anthroyloxy chromophore (2-AS, 9-AS, and 16-AP) in bilayers composed of palmitoyl-oleoyl-phosphatidylcholine. The obtained data revealed a nontrivial solvation response of these dyes, which are located in the backbone region of the bilayer with a gradually increasing depth. For comparison, steady-state emission spectra in the neat solvents of various polarities and viscosities were also recorded. The results indicate that on the short picosecond time scale the AS dyes undergo complex photophysics including formation of states with a charge-transfer character. This observation is supported by ab initio calculations of the excited states of 9-methylanthroate. The slower nanosecond part of the relaxation process can be attributed to the solvation response of the dyes. A slowdown in solvent relaxation is observed upon moving toward the center of the bilayer. A mechanism similar to preferential solvation present in the mixture of a polar and nonpolar solvent is considered to explain the obtained data.
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Affiliation(s)
- Jan Sýkora
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, Prague 8, Czech Republic.
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Li H, Arzhantsev S, Maroncelli M. Solvation and Solvatochromism in CO2-Expanded Liquids. 2. Experiment−Simulation Comparisons of Preferential Solvation in Three Prototypical Mixtures. J Phys Chem B 2007; 111:3208-21. [PMID: 17388463 DOI: 10.1021/jp067916y] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Electronic absorption and emission spectra of 10-bis(phenylethynyl)anthracene (PEA) and coumarin 153 (C153) are measured as functions of composition along the bubble-point curve at 25 degrees C in CO2-expanded cyclohexane (c-C6H12), acetonitrile (CH3CN), and methanol (CH3OH). The nonlinear dependence of the spectral frequencies on composition suggests substantial preferential solvation of both solutes by the liquid components of these mixtures. Estimates of enrichment factors (local mole fraction of a component divided by its bulk value) based on the assumption that spectral shifts are linearly related to local composition are quite large (approximately 10) in the cases of the C153/CH3CN + CO2 and C153/CH3OH + CO2 systems at high xCO2. Computer simulations of anthracene, the chromophore of PEA, and C153 in these three CO2-expanded liquids are used to clarify the relationship between local composition and spectral shift. A semiempirical model consisting of additive electrostatic and dispersive interactions is able to capture the main features observed experimentally in all six solute/solvent combinations. The simulations show that the commonly used assumption of a linear relation between spectral shifts and local compositions grossly exaggerates the extent of preferential solvation in these mixtures. The collective nature of electrostatic solvation and the composition dependence of the solute's coordination number are shown to be responsible for the breakdown of this assumption.
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Affiliation(s)
- Hongping Li
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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23
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Murata S, Yoshimori A. Nonlinear effects on solvation dynamics in simple mixtures. J Chem Phys 2006; 125:244501. [PMID: 17199349 DOI: 10.1063/1.2409713] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The authors applied the time dependent density functional method (TDDFM) and a linear model to solvation dynamics in simple binary solvents. Changing the solute-solvent interactions at t=0, the authors calculated the time evolution of density fields for solvent particles after the change (t>0) by the TDDFM and linear model. First, the authors changed the interaction of only one component of solvents. In this case, the TDDFM showed that the solvation time decreased monotonically with a mole fraction of the solvent strongly interacting with the solute. The monotonical decreases agreed with experimental results, while the linear model did not reproduce these results. The authors also calculated the solvation time by changing the interaction of both components. The calculation showed that the mole fraction dependence had the peak. The TDDFM presented a much higher peak than the linear model. The difference between the TDDFM and the linear model was caused by a nonlinear effect on an exchange process of solvent particles.
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Affiliation(s)
- Shuhei Murata
- Department of Physics, Kyushu University, Fukuoka 812-8581, Japan
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Tablet C, Jelea A, Hillebrand M. Experimental and theoretical study of 3-carboxy-5,6-benzocoumarin. J Photochem Photobiol A Chem 2006. [DOI: 10.1016/j.jphotochem.2006.02.028] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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25
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Ladanyi BM, Nugent S. The effects of solute-solvent electrostatic interactions on solvation dynamics in supercritical CO2. J Chem Phys 2006; 124:044505. [PMID: 16460183 DOI: 10.1063/1.2148967] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
We present here the results of molecular-dynamics simulation of solvation dynamics in supercritical CO(2) at a temperature of about 1.05T(c), where T(c) is the critical temperature, and at a series of densities ranging from 0.4 to 2.0 of the critical density rho(c). We focus on electrostatic solvation dynamics, representing the electronic excitation of the chromophore as a change in its charge distribution from a quadrupolar-symmetry ground state to a dipolar excited state. Two perturbations are considered, corresponding to different magnitudes of solute excited-state dipoles, denoted as d5 and d8. The d8 solute is more attractive, leading to a larger enhancement in CO(2) clustering upon solute electronic excitation. This has a large impact on solvation dynamics, especially at densities below rho(c). At these densities, solvation dynamics is much slower for the d8 than for the d5 solute. For both solutes, solvation dynamics becomes faster at densities above rho(c) at which solvent clustering diminishes. We show that the slowest solvation time scale is associated with solvent clustering and we relate it to solute-solvent mutual translational diffusion and the extent of change in effective local density resulting from solute electronic excitation.
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Affiliation(s)
- Branka M Ladanyi
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA.
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27
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Petrov NK. A fluorescence spectroscopy study of preferential solvation in binary solvents. HIGH ENERGY CHEMISTRY 2006. [DOI: 10.1134/s001814390601005x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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28
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Sahu K, Mondal SK, Roy D, Karmakar R, Bhattacharyya K. Slow solvation dynamics of 4-AP and DCM in binary mixtures. J Photochem Photobiol A Chem 2005. [DOI: 10.1016/j.jphotochem.2004.12.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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29
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Study of relationship of atomic orbital hybridization with bonding using hybridization displacement charge: optimal hybridization principle. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.theochem.2004.08.067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Sakurai M, Yoshimori A. Bandwidth analysis of solvation dynamics in a simple liquid mixture. J Chem Phys 2005; 122:104509. [PMID: 15836334 DOI: 10.1063/1.1857480] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The time-dependent energy distribution of solvation dynamics is studied by molecular dynamics simulations of a Lennard-Jones mixture. We calculate the response functions of the average and the variance which correspond to the spectral peak shift and bandwidth. Our calculation shows that the variance relaxation is slower than that of the average. The result agrees qualitatively with the experimental results. Dividing the obtained response functions into subcomponents caused by each solvent, we find that the relaxation is dominated by that solvent which strongly interacts with the solute. Extracting the redistribution component from the response functions, we find that it causes the slower relaxation of the response function. Thus, we conclude that the difference of the slower relaxations between the average and variance is caused by the redistribution process.
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Affiliation(s)
- M Sakurai
- Department of Physics, Kyushu University, Fukuoka 812-8581, Japan.
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31
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Solvation response in water: a study based on molecular dynamics simulations and quantum mechanical calculations. J Mol Liq 2005. [DOI: 10.1016/j.molliq.2004.08.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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32
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Egorov SA. Solvation dynamics in supercritical fluids: Equilibrium versus nonequilibrium solvent response functions. J Chem Phys 2004; 121:6948-55. [PMID: 15473754 DOI: 10.1063/1.1789932] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
We present a theoretical study of solvation dynamics in supercritical fluids. Molecular dynamics simulations show a significant difference between equilibrium and nonequilibrium solvent response functions, especially pronounced at medium and low solvent densities. We propose an analytical theory for the nonequilibrium solvation function based on the generalized nonlinear Smoluchowski-Vlasov equation. The theory is shown to be in good agreement with simulation, providing an accurate description of the nonequilibrium time-dependent solvent density profile around the solute over a wide range of supercritical solvent densities. The nonequilibrium solvent response function is shown to reflect gradual solvent clustering around the excited solute.
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Affiliation(s)
- S A Egorov
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22901, USA
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33
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Hybridization displacement charges in molecules involving second and third row atoms: correlation with polarizability. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.theochem.2004.03.045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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34
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Egorov SA. Ion solvation dynamics in supercritical fluids. PHYSICAL REVIEW LETTERS 2004; 93:023004. [PMID: 15323911 DOI: 10.1103/physrevlett.93.023004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2004] [Indexed: 05/24/2023]
Abstract
We present a theoretical study of ion solvation dynamics in a supercritical solvent. Molecular dynamics simulations show a significant difference between equilibrium and nonequilibrium solvent response functions, especially pronounced at medium and low solvent densities. We propose a simple analytical theory for the nonequilibrium solvation function based on the generalized nonlinear Smoluchowski-Vlasov equation. The theory is shown to be in excellent agreement with simulation over a wide range of supercritical solvent densities.
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Affiliation(s)
- S A Egorov
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22901, USA
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Affiliation(s)
- Abderrazzak Douhal
- Departamento de Química Física, Sección de Químicas, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N. 45071 Toledo, Spain.
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Gorbatsevich SK, Smirnova OY. Solvatochromic and thermochromic shifts of electronic spectra of polar solute molecules in a mixture of polar and nonpolar solvent; the role of solvent–solvent interactions. J Chem Phys 2004; 120:1369-74. [PMID: 15268262 DOI: 10.1063/1.1633753] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A theoretical model is proposed to describe the influence of the concentration of a polar solvent and the temperature of a solution on the electronic spectra of a polar solute in a binary solvent mixture. It is shown that the interaction between molecules of the polar solvent in the first solvation shell makes the significant contribution to the formation of absorption and fluorescence bands of the solute. An experimental study of solvatochromic and thermochromic shifts of steady-state fluorescence spectra of 3-amino-N-methylphthalimide in decalin--propanol mixture for different values of propanol mole fraction is carried out. Good qualitative agreement between the experimental data and calculation results is observed.
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Affiliation(s)
- Sergej K Gorbatsevich
- Department of Physics, Belarusian State University, 4 Skorina Ave, Minsk 220050, Belarus
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37
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Mukherjee S, Sahu K, Roy D, Mondal SK, Bhattacharyya K. Solvation dynamics of 4-aminophthalimide in dioxane–water mixture. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2003.11.098] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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38
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Vaiana AC, Neuweiler H, Schulz A, Wolfrum J, Sauer M, Smith JC. Fluorescence Quenching of Dyes by Tryptophan: Interactions at Atomic Detail from Combination of Experiment and Computer Simulation. J Am Chem Soc 2003; 125:14564-72. [PMID: 14624606 DOI: 10.1021/ja036082j] [Citation(s) in RCA: 133] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fluorescence spectroscopy and molecular dynamics (MD) simulation are combined to characterize the interaction of two organic fluorescent dyes, rhodamine 6G (R6G) and an oxazine derivative (MR121), with the amino acid tryptophan in aqueous solution. Steady-state and time-resolved fluorescence quenching experiments reveal the formation of essentially nonfluorescent ground-state dye/Trp complexes. The MD simulations are used to elucidate the molecular interaction geometries involved. The MD-derived probability distribution of the distance r between the centers of geometry of the dye and quencher ring systems, P(r), extends to higher distances for R6G than for MR121 due to population in the R6G/Trp system of fluorescent interaction geometries between Trp and the phenyl ring and ester group of the dye. The consequence of this is the experimental finding that under the conditions used in the simulations about 25% of the R6G dye is fluorescent in comparison with 10% of the MR121. Combining the above findings allows determination of the "quenching distance", r, above which no quenching occurs. r is found to be very similar (approximately 5.5 A) for both dye/Trp systems, corresponding to close to van der Waals contact. Both experimental dynamic Stern-Volmer analysis and the MD trajectories demonstrate that the main determinant of the fluorescence intensity is static quenching. The approach presented is likely to be useful in the structural interpretation of data obtained from fluorescent conjugates commonly used for monitoring the binding and dynamics of biomolecular systems.
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Affiliation(s)
- Andrea C Vaiana
- IWR-Computational Molecular Biophysics, Universität Heidelberg, Im Neuenheimer Feld 368, D-69120 Heidelberg, Germany
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Molotsky T, Huppert D. Solvation Statics and Dynamics of Coumarin 153 in Dioxane−Water Solvent Mixtures. J Phys Chem A 2003. [DOI: 10.1021/jp034760i] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tatiana Molotsky
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
| | - Dan Huppert
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
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40
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Kim TG, Wolford MF, Topp MR. Ultrashort-lived excited states of aminophthalimides in fluid solution. Photochem Photobiol Sci 2003; 2:576-84. [PMID: 12803081 DOI: 10.1039/b300493g] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Sn-->S0 ultraviolet fluorescence spectra (270-380 nm) of 4-aminophthalimide (4AP) and its N-methyl derivative 4-amino-N-methylphthalimide (4ANMP) are reported, following the absorption of two laser pulses. In polar but non-hydrogen-bonding solvents, both molecules exhibit a principal emission maximum near 290 nm, whereas solutions in hydrogen-bonding solvents display two prominent emission bands, near 300 and 350 nm. The relative intensities of these bands depend on solvent type and, in a pump-probe experiment, on the wavelengths and temporal spacing of two ultrashort pulses. Experiments covering the range approximately 0.1-100 ps showed evidence for at least two distinct ultrashort relaxation processes, the rates of which depend on solvent. Fluorescence upconversion experiments at < 0.2 ps resolution have shown that the longer-duration process correlates with the fluorescence Stokes shift, and provide evidence that the solvent-dependent shift of the S1-->S0 fluorescence spectrum is reflected in the fluorescence quantum efficiency of a nearby electronic state.
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Affiliation(s)
- Taeg Gyum Kim
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
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41
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Fischer K, Prause S, Spange S, Cichos F, Von Borczyskowski C. Surface polarity of cellulose derivates observed by coumarin 151 and 153 as solvatochromic and fluorochromic probes. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/polb.10475] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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42
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Martins LR, Tamashiro A, Laria D, Skaf MS. Solvation dynamics of coumarin 153 in dimethylsulfoxide–water mixtures: Molecular dynamics simulations. J Chem Phys 2003. [DOI: 10.1063/1.1556296] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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43
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Martins LR, Skaf MS. Computer simulations of the solvation dynamics of Coumarin 153 in dimethylsulfoxide. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00159-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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44
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Molecular electrostatic properties using point charges: ab initio hybridization displacement charges combined with bond-centered charges. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0166-1280(02)00642-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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45
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Molotsky T, Huppert D. Solvation Statics and Dynamics of Coumarin 153 in Hexane−Propionitrile Solvent Mixtures. J Phys Chem A 2002. [DOI: 10.1021/jp014653t] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tatiana Molotsky
- Raymond & Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
| | - Dan Huppert
- Raymond & Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
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46
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Affiliation(s)
- Noam Agmon
- Department of Physical Chemistry, The Hebrew University, Jerusalem 91904, Israel
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47
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Ladanyi BM, Perng BC. Solvation Dynamics in Dipolar−Quadrupolar Mixtures: A Computer Simulation Study of Dipole Creation in Mixtures of Acetonitrile and Benzene. J Phys Chem A 2002. [DOI: 10.1021/jp013580a] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Branka M. Ladanyi
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
| | - Baw-Ching Perng
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
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48
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Smith W, Yong C, Rodger P. DL_POLY: Application to molecular simulation. MOLECULAR SIMULATION 2002. [DOI: 10.1080/08927020290018769] [Citation(s) in RCA: 381] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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49
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Królicki R, Jarzȩba W, Mostafavi M, Lampre I. Preferential Solvation of Coumarin 153The Role of Hydrogen Bonding. J Phys Chem A 2002. [DOI: 10.1021/jp013916g] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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50
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Luther BM, Kimmel JR, Levinger NE. Dynamics of polar solvation in acetonitrile–benzene binary mixtures: Role of dipolar and quadrupolar contributions to solvation. J Chem Phys 2002. [DOI: 10.1063/1.1436074] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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