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Luo X, Jian Y, Li H. Low-temperature reduction of bio-based cinnamaldehyde to α,β-(un)saturated alcohols enabled by a waste-derived catalyst. CATAL COMMUN 2022. [DOI: 10.1016/j.catcom.2021.106391] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
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2
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Homocianu M. Optical properties of solute molecules: Environmental effects, challenges, and their practical implications. Microchem J 2021. [DOI: 10.1016/j.microc.2020.105797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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3
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Weiß N, Schmidt CH, Thielemann G, Heid E, Schröder C, Spange S. The physical significance of the Kamlet–Taft π* parameter of ionic liquids. Phys Chem Chem Phys 2021; 23:1616-1626. [DOI: 10.1039/d0cp04989a] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Kamlet–Taft dipolarity/polarizability parameters π* for various ionic liquids were determined using 4-tert-butyl-2-((dicyanomethylene)-5-[4-N,N-diethylamino)-benzylidene]-Δ3-thiazoline and 5-(N,N-dimethylamino)-5′-nitro-2,2′-bithiophene as solvatochromic probes.
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Affiliation(s)
- Nadine Weiß
- Chemnitz University of Technology
- 09111 Chemnitz
- Germany
| | | | | | - Esther Heid
- University of Vienna
- Faculty of Chemistry
- Institute for Computational Biological Chemistry
- A-1090 Vienna
- Austria
| | - Christian Schröder
- University of Vienna
- Faculty of Chemistry
- Institute for Computational Biological Chemistry
- A-1090 Vienna
- Austria
| | - Stefan Spange
- Chemnitz University of Technology
- 09111 Chemnitz
- Germany
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4
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Reaction conditions, photophysical, electrochemical, conductivity, and thermal properties of polyazomethines. Macromol Res 2017. [DOI: 10.1007/s13233-017-5072-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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5
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Budzák Š, Jaunet-Lahary T, Laurent AD, Laurence C, Medved' M, Jacquemin D. Exploring the Solvatochromism of Betaine 30 with Ab Initio Tools: From Accurate Gas-Phase Calculations to Implicit and Explicit Solvation Models. Chemistry 2017; 23:4108-4119. [DOI: 10.1002/chem.201604619] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Šimon Budzák
- CEISAM; UMR CNRS 6230, BP 92208; 2 Rue de la Houssinière 44322 Nantes, Cedex 3 France
| | - Titouan Jaunet-Lahary
- CEISAM; UMR CNRS 6230, BP 92208; 2 Rue de la Houssinière 44322 Nantes, Cedex 3 France
| | - Adèle D. Laurent
- CEISAM; UMR CNRS 6230, BP 92208; 2 Rue de la Houssinière 44322 Nantes, Cedex 3 France
| | - Christian Laurence
- CEISAM; UMR CNRS 6230, BP 92208; 2 Rue de la Houssinière 44322 Nantes, Cedex 3 France
| | - Miroslav Medved'
- Department of Chemistry; Faculty of Natural Sciences; Matej Bel University, Tajovského 40; 97400 Banská Bystrica Slovak Republic
| | - Denis Jacquemin
- CEISAM; UMR CNRS 6230, BP 92208; 2 Rue de la Houssinière 44322 Nantes, Cedex 3 France
- Institut Universitaire de France; 1 rue Descartes 75231 Paris Cedex 05 France
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6
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Reif MM, Hünenberger PH. Origin of Asymmetric Solvation Effects for Ions in Water and Organic Solvents Investigated Using Molecular Dynamics Simulations: The Swain Acity-Basity Scale Revisited. J Phys Chem B 2016; 120:8485-517. [PMID: 27173101 DOI: 10.1021/acs.jpcb.6b02156] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The asymmetric solvation of ions can be defined as the tendency of a solvent to preferentially solvate anions over cations or cations over anions, at identical ionic charge magnitudes and effective sizes. Taking water as a reference, these effects are quantified experimentally for many solvents by the relative acity (A) and basity (B) parameters of the Swain scale. The goal of the present study is to investigate the asymmetric solvation of ions using molecular dynamics simulations, and to connect the results to this empirical scale. To this purpose, the charging free energies of alkali and halide ions, and of their hypothetical oppositely charged counterparts, are calculated in a variety of solvents. In a first set of calculations, artificial solvent models are considered that present either a charge or a shape asymmetry at the molecular level. The solvation asymmetry, probed by the difference in charging free energy between the two oppositely charged ions, is found to encompass a term quadratic in the ion charge, related to the different solvation structures around the anion and cation, and a term linear in the ion charge, related to the solvation structure around the uncharged ion-sized cavity. For these simple solvent models, the two terms are systematically counteracting each other, and it is argued that only the quadratic term should be retained when comparing the results of simulations involving physical solvents to experimental data. In a second set of calculations, 16 physical solvents are considered. The theoretical estimates for the acity A are found to correlate very well with the Swain parameters, whereas the correlation for B is very poor. Based on this observation, the Swain scale is reformulated into a new scale involving an asymmetry parameter Σ, positive for acitic solvents and negative for basitic ones, and a polarity parameter Π. This revised scale has the same predictive power as the original scale, but it characterizes asymmetry in an absolute sense, the atomistic simulations playing the role of an extra-thermodynamic assumption, and is optimally compatible with the simulation results. Considering the 55 solvents in the Swain set, it is observed that a moderate basity (Σ between -0.9 and -0.3, related to electronic polarization) represents the baseline for most solvents, while a highly variable acity (Σ between 0.0 and 3.0, related to hydrogen-bond donor capacity modulated by inductive effects) represents a landmark of protic solvents.
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Affiliation(s)
- Maria M Reif
- Physics Department (T38), Technische Universität München , D-85748 Garching, Germany
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Dyer KM, Perkyns JS, Pettitt BM. Solubility Limits in Lennard-Jones Mixtures: Effects of Disparate Molecule Geometries. J Phys Chem B 2015; 119:9450-9. [PMID: 25621892 DOI: 10.1021/jp512992n] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In order to better understand general effects of the size and energy disparities between macromolecules and solvent molecules in solution, especially for macromolecular constructs self-assembled from smaller molecules, we use the first- and second-order exact bridge diagram extensions of the HNC integral equation theory to investigate single-component, binary, ternary, and quaternary mixtures of Lennard-Jones fluids. For pure fluids, we find that the HNCH3 bridge function integral equation (i.e., exact to third order in density) is necessary to quantitatively predict the pure gas and pure liquid sides of the coexistence region of the phase diagram of the Lennard-Jones fluid. For the mixtures, we find that the HNCH2 bridge function integral equation is sufficient to qualitatively predict solubility in the binary, ternary, and quaternary mixtures, up to the nominal solubility limit. The results, as limiting cases, should be useful to several problems, including accurate phase diagram predictions for complex mixtures, design of self-assembling nanostructures via solvent controls, and the solvent contributions to the conformational behavior of macromolecules in complex fluids.
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Affiliation(s)
- Kippi M Dyer
- Sealy Center for Structural Biology and Molecular Biophysics, Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, Texas 77555-0304, United States
| | - John S Perkyns
- Sealy Center for Structural Biology and Molecular Biophysics, Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, Texas 77555-0304, United States
| | - B Montgomery Pettitt
- Sealy Center for Structural Biology and Molecular Biophysics, Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, Texas 77555-0304, United States
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9
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Akamatsu M, Mori T, Okamoto K, Komatsu H, Kumagai K, Shiratori S, Yamamura M, Nabeshima T, Sakai H, Abe M, Hill JP, Ariga K. Detection of ethanol in alcoholic beverages or vapor phase using fluorescent molecules embedded in a nanofibrous polymer. ACS APPLIED MATERIALS & INTERFACES 2015; 7:6189-6194. [PMID: 25756646 DOI: 10.1021/acsami.5b00289] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
An alcohol sensor was developed using the solid-state fluorescence emission of terphenyl-ol (TPhOH) derivatives. Admixtures of TPhOH and sodium carbonate exhibited bright sky-blue fluorescence in the solid state upon addition of small quantities of ethanol. A series of terphenol derivatives was synthesized, and the effects of solvent polarities and the structures of these π-conjugated systems on their fluorescence were systematically investigated by using fluorescence spectroscopy. In particular, π-extended TPhOHs and TPhOHs containing electron-withdrawing groups exhibited significant solvatochromism, and fluorescence colors varied from blue to red. Detection of ethanol contents in alcohol beverages (detection limit ∼ 5 v/v %) was demonstrated using different TPhOHs revealing the effect of molecular structure on sensing properties. Ethanol contents in alcoholic beverages could be estimated from the intensity of the fluorescence elicited from the TPhOHs. Moreover, when terphenol and Na2CO3 were combined with a water-absorbent polymer, ethanol could be detected at lower concentrations. Detection of ethanol vapor (8 v/v % in air) was also accomplished using a nanofibrous polymer scaffold as the immobilized sensing film.
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Affiliation(s)
- Masaaki Akamatsu
- †Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-0022, Japan
- ‡WPI-International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Taizo Mori
- ‡WPI-International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- §CREST, Japan Science and Technology Agency (JST), Gobancho, Chiyoda-ku, Tokyo 102-0075, Japan
| | - Ken Okamoto
- ‡WPI-International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Hirokazu Komatsu
- ‡WPI-International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Ken Kumagai
- ∥Graduate School of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kouhoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Seimei Shiratori
- ∥Graduate School of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kouhoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Masaki Yamamura
- ⊥Graduate School of Pure and Applied Sciences and Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan
| | - Tatsuya Nabeshima
- ⊥Graduate School of Pure and Applied Sciences and Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan
| | - Hideki Sakai
- †Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-0022, Japan
| | - Masahiko Abe
- †Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-0022, Japan
| | - Jonathan P Hill
- ‡WPI-International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- §CREST, Japan Science and Technology Agency (JST), Gobancho, Chiyoda-ku, Tokyo 102-0075, Japan
| | - Katsuhiko Ariga
- ‡WPI-International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- §CREST, Japan Science and Technology Agency (JST), Gobancho, Chiyoda-ku, Tokyo 102-0075, Japan
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10
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Fedunov RG, Plotnikova AV, Ionkin VN, Ivanov AI. Dynamics of ground state absorption spectra in donor-acceptor pairs with ultrafast charge recombination. J Phys Chem A 2015; 119:1964-72. [PMID: 25686470 DOI: 10.1021/acs.jpca.5b00725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A theoretical approach to simulation of the transient spectra in molecular systems with ultrafast photoinduced nonradiative electronic transitions is developed. The evolution of the excited and ground state populations as well as the nonradiative transitions between them are calculated in the framework of the stochastic multichannel point-transition model involving the reorganization of the medium and the intramolecular high frequency vibrational modes. Simulations of transient spectra of donor-acceptor pairs excited in the charge-transfer band that are accompanied by ultrafast charge recombination into the ground state demonstrate a possibility of positive band appearance in the transient absorption spectrum caused by those systems in the ground state, which returned there from the excited state. The region of the parameters of the donor-acceptor systems where a positive ground state absorption signal can be observed is discussed. A qualitative comparison of the simulated transient spectra with the experimental data on betaine-30 is presented.
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Affiliation(s)
- Roman G Fedunov
- Volgograd State University , University Avenue 100, Volgograd 400062, Russia
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Askim JR, Mahmoudi M, Suslick KS. Optical sensor arrays for chemical sensing: the optoelectronic nose. Chem Soc Rev 2014; 42:8649-82. [PMID: 24091381 DOI: 10.1039/c3cs60179j] [Citation(s) in RCA: 466] [Impact Index Per Article: 46.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A comprehensive review is presented on the development and state of the art of colorimetric and fluorometric sensor arrays. Optical arrays based on chemoresponsive colorants (dyes and nanoporous pigments) probe the chemical reactivity of analytes, rather than their physical properties. This provides a high dimensionality to chemical sensing that permits high sensitivity (often down to ppb levels), impressive discrimination among very similar analytes and exquisite fingerprinting of extremely similar mixtures over a wide range of analyte types, both in the gas and liquid phases.
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Affiliation(s)
- Jon R Askim
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Av., Urbana, Illinois 61801, USA.
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12
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Cerón-Carrasco JP, Jacquemin D, Laurence C, Planchat A, Reichardt C, Sraïdi K. Determination of a Solvent Hydrogen-Bond Acidity Scale by Means of the Solvatochromism of Pyridinium-N-phenolate Betaine Dye 30 and PCM-TD-DFT Calculations. J Phys Chem B 2014; 118:4605-14. [DOI: 10.1021/jp501534n] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- José P. Cerón-Carrasco
- Laboratoire
CEISAM, UMR CNRS 6230, Université de Nantes, 2, rue de
la Houssinière, 44322 Nantes, France
- Departamento
de Quimica Fisica, Universidad de Murcia, Campus de Espinardo, 30100 Murcia, Spain
| | - Denis Jacquemin
- Laboratoire
CEISAM, UMR CNRS 6230, Université de Nantes, 2, rue de
la Houssinière, 44322 Nantes, France
- Institut Universitaire de France (IUF), 103 Boulevard Saint-Michel, 75005 Paris, France
| | - Christian Laurence
- Laboratoire
CEISAM, UMR CNRS 6230, Université de Nantes, 2, rue de
la Houssinière, 44322 Nantes, France
| | - Aurélien Planchat
- Laboratoire
CEISAM, UMR CNRS 6230, Université de Nantes, 2, rue de
la Houssinière, 44322 Nantes, France
| | - Christian Reichardt
- Fachbereich
Chemie, Philipps-Universität, Hans-Meerwein-Strasse, 35032 Marburg, Germany
| | - Khadija Sraïdi
- Laboratoire
de Chimie Bioorganique, Faculté des Sciences, Université Chouaïb Doukkali, El Jadida, Morocco
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13
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Tomlinson SR, Kehr CW, Lopez MS, Schlup JR, Anthony JL. Solubility of the Corn Protein Zein in Imidazolium-based Ionic Liquids. Ind Eng Chem Res 2014. [DOI: 10.1021/ie403659x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sean R. Tomlinson
- Department of Chemical Engineering, Kansas State University, 1005
Durland Hall, Manhattan, Kansas 66506, United States
| | - Christian W. Kehr
- Department of Chemical Engineering, Kansas State University, 1005
Durland Hall, Manhattan, Kansas 66506, United States
| | - Mayra S. Lopez
- Department of Chemical Engineering, Kansas State University, 1005
Durland Hall, Manhattan, Kansas 66506, United States
| | - John R. Schlup
- Department of Chemical Engineering, Kansas State University, 1005
Durland Hall, Manhattan, Kansas 66506, United States
| | - Jennifer L. Anthony
- Department of Chemical Engineering, Kansas State University, 1005
Durland Hall, Manhattan, Kansas 66506, United States
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Wielgus M, Zaleśny R, Murugan NA, Kongsted J, Ågren H, Samoc M, Bartkowiak W. Two-Photon Solvatochromism II: Experimental and Theoretical Study of Solvent Effects on the Two-Photon Absorption Spectrum of Reichardt’s Dye. Chemphyschem 2013; 14:3731-9. [DOI: 10.1002/cphc.201300695] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 08/07/2013] [Indexed: 11/10/2022]
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Renge I, Mauring K. Spectral shift mechanisms of chlorophylls in liquids and proteins. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 102:301-313. [PMID: 23220672 DOI: 10.1016/j.saa.2012.10.034] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Revised: 10/18/2012] [Accepted: 10/19/2012] [Indexed: 05/27/2023]
Abstract
Origins of non-excitonic spectral shifts of chlorophylls that can reach -1,000 cm(-1) in pigment-protein complexes are actively debated in literature. We investigate possible shift mechanisms, basing on absorption and fluorescence measurements in large number of liquids. Transition wavelength in solvent-free state was estimated (±2 nm) for chlorophyll a (Chl a, 647 nm), Chl b (624 nm), bacteriochlorophyll a (BChl a, 752 nm), and pheophytines. The dispersive-repulsive shift is a predominating mechanism. It depends on polarizability difference between the ground and the excited state Δα and the Lorenz-Lorentz function of refractive index of solvent (n). The approximate (± 2Å(3)) increase of polarizability Δα is close to 15Å(3) for S(1) bands of Chl a, BChl a, and BPheo a, slightly larger for Chl b (18Å(3)), and less for Pheo a (11Å(3)). The effect of solvent polarity, expressed in terms of static dielectric permittivity (ε) is relatively minor, but characteristic for different pigments and transitions. Remarkably, maximum influence of ε on S(1) band of BChl a is less (-20 ± 10 cm(-1)) than that for Chl a (-50 ± 10 cm(-1)), and not correlated with dipole moment changes on excitation Δμ (∼2D and 0.1 ± 0.1D, respectively). Hydrogen bonding in protic solvents produces red shifts in Chl a (-60 cm(-1)) and BChl a (-100 cm(-1)), but not in Chl b. Second axial ligand of BChl a has no influence on the S(1) band, whereas the S(2) transition suffers a -400 to -600 cm(-1) down shift. Aromatic character of solvent is responsible for a ∼-100 cm(-1) red shift of both Q transitions in BChl a. The S(1) bands in chlorophylls are relatively insensitive with respect to dielectric properties and specific solvation. Therefore, nontrivial mechanisms, yielding large site-energy shifts are expected in photosynthetic chlorophyll-proteins.
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Affiliation(s)
- Indrek Renge
- Institute of Physics, University of Tartu, 142 Riia Street, EE51014 Tartu, Estonia.
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Martin DR, Matyushov DV. Non-Gaussian statistics and nanosecond dynamics of electrostatic fluctuations affecting optical transitions in proteins. J Phys Chem B 2012; 116:10294-300. [PMID: 22861814 DOI: 10.1021/jp305757t] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We show that electrostatic fluctuations of the protein-water interface are globally non-Gaussian. The electrostatic component of the optical transition energy (energy gap) in a hydrated green fluorescent protein is studied here by classical molecular dynamics simulations. The distribution of the energy gap displays a high excess in the breadth of electrostatic fluctuations over the prediction of the Gaussian statistics. The energy gap dynamics include a nanosecond component. When simulations are repeated with frozen protein motions, the statistics shifts to the expectations of linear response and the slow dynamics disappear. We therefore suggest that both the non-Gaussian statistics and the nanosecond dynamics originate largely from global, low-frequency motions of the protein coupled to the interfacial water. The non-Gaussian statistics can be experimentally verified from the temperature dependence of the first two spectral moments measured at constant-volume conditions. Simulations at different temperatures are consistent with other indicators of the non-Gaussian statistics. In particular, the high-temperature part of the energy gap variance (second spectral moment) scales linearly with temperature and extrapolates to zero at a temperature characteristic of the protein glass transition. This result, violating the classical limit of the fluctuation-dissipation theorem, leads to a non-Boltzmann statistics of the energy gap and corresponding non-Arrhenius kinetics of radiationless electronic transitions, empirically described by the Vogel-Fulcher-Tammann law.
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Affiliation(s)
- Daniel R Martin
- Center for Biological Physics, Arizona State University , PO Box 871504, Tempe, Arizona 85287-1504, United States
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17
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Nelson KV, Benjamin I. Electronic Absorption Line Shapes at the Water Liquid/Vapor Interface. J Phys Chem B 2012; 116:4286-91. [DOI: 10.1021/jp3010037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Katherine V. Nelson
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064,
United States
| | - Ilan Benjamin
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064,
United States
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Klimavicz JS, Mike JF, Bhuwalka A, Tomlinson AL, Jeffries-EL M. Synthesis of benzobisoxazole-based D-π-A-π-D organic chromophores with variable optical and electronic properties. PURE APPL CHEM 2012. [DOI: 10.1351/pac-con-11-10-23] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A series of symmetrical D-π-A-π-D molecules comprised of benzo[1,2-d;4,5-d']bisoxazole (BBO) and various arylenevinylenes was synthesized via a Knoevenagel condensation of 2,6-dimethyl BBO and the corresponding aryl aldehydes. The resulting compounds had energy levels that were easily modulated and broad absorptions in the visible spectrum. They also demonstrated high fluorescence quantum yields in solution. The solvatochromism of several derivatives was examined in a number of solvents, and it was found that the emission of the triphenylamine derivative varied by almost 100 nm, depending on the polarity of the solvent. Collectively, these results indicate that the optical and electronic properties of benzobisoxazoles are readily tuned through the choice of aryl co-monomer.
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Affiliation(s)
| | - Jared F. Mike
- 1Department of Chemistry, Iowa State University, Ames, IA 50011, USA
| | - Achala Bhuwalka
- 1Department of Chemistry, Iowa State University, Ames, IA 50011, USA
| | - Aimeé L. Tomlinson
- 2Department of Chemistry, North Georgia College & State University, Dahlonega, GA 30597, USA
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Hartvig RA, van de Weert M, Ostergaard J, Jorgensen L, Jensen H. Formation of dielectric layers and charge regulation in protein adsorption at biomimetic interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:1804-1815. [PMID: 22185404 DOI: 10.1021/la204309a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Protein charge is an important parameter in the understanding of protein interactions and function. Proteins are subject to dynamic charge regulation, that is, the influence of the local environment (such as charged interfaces and biopolymers) on protein charge. Charge regulation is governed by differences in the dielectric and electrostatic environment between adsorbed protein and the free protein in bulk solution. In this work protein charge regulation is addressed experimentally by employing electrochemistry at interfaces between two immiscible electrolyte solutions (ITIES) as well as theoretically by developing a new protein adsorption model at ITIES. Electrochemistry at ITIES is shown to be particularly well suited to study protein charge regulation as the adsorbed protein experiences a different dielectric environment compared to the bulk phase and the external control of the water/oil potential difference allows systematic studies on how potential induced ion gradients affect protein charge. The theoretical model incorporates all the features of the experimental system and specifically takes into account protein charge regulation at ITIES as well as the impact of the formation of dielectric layers on the experimentally observed impedance. The model parameters include the protein charge-pH profile, bulk pH, and the overall potential difference. It is shown that the formation of a dielectric layer and the associated charge regulation are the main factors dictating the observed experimental behavior. Finally, the theoretical model is used to interpret literature results, and the consistency between the model and the relatively large data set suggests that the model may be used more generally for understanding and predicting protein adsorption.
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Affiliation(s)
- Rune A Hartvig
- Department of Pharmaceutics and Analytical Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
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Gutkowski KI, Fernández-Prini R, Aramendía PF, Japas ML. Critical Effects on Attractive Solutes in Binary Liquid Mixtures Close to Their Consolute Point: A New Experimental Strategy. J Phys Chem B 2011; 115:15303-12. [DOI: 10.1021/jp209007y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Karin I. Gutkowski
- Gerencia Química, CAC, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429-Buenos Aires, Argentina
| | - Roberto Fernández-Prini
- Gerencia Química, CAC, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429-Buenos Aires, Argentina
- INQUIMAE/DQIAQF, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428-Buenos Aires, Argentina
| | - Pedro F. Aramendía
- INQUIMAE/DQIAQF, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428-Buenos Aires, Argentina
| | - M. Laura Japas
- Gerencia Química, CAC, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429-Buenos Aires, Argentina
- Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, Martín de Irigoyen 3100, 1650-San Martín, Provincia Buenos Aires, Argentina
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21
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22
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Oliveira LB, Fonseca TL, Coutinho K, Canuto S. A sequential MC/TD-DFT study of the solvatochromic shift of the pyridinium-N-phenoxide betaine dye in water using standard and long-range corrected functionals. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.08.056] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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23
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Arun KT, Jayaram DT, Avirah RR, Ramaiah D. β-Cyclodextrin as a Photosensitizer Carrier: Effect on Photophysical Properties and Chemical Reactivity of Squaraine Dyes. J Phys Chem B 2011; 115:7122-8. [DOI: 10.1021/jp201784b] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kalliat T. Arun
- Photosciences and Photonics, Chemical Sciences and Technology Division, National Institute for Interdisciplinary Science and Technology (NIIST), CSIR, Trivandrum 695 019, India
| | - Dhanya T. Jayaram
- Photosciences and Photonics, Chemical Sciences and Technology Division, National Institute for Interdisciplinary Science and Technology (NIIST), CSIR, Trivandrum 695 019, India
| | - Rekha R. Avirah
- Photosciences and Photonics, Chemical Sciences and Technology Division, National Institute for Interdisciplinary Science and Technology (NIIST), CSIR, Trivandrum 695 019, India
| | - Danaboyina Ramaiah
- Photosciences and Photonics, Chemical Sciences and Technology Division, National Institute for Interdisciplinary Science and Technology (NIIST), CSIR, Trivandrum 695 019, India
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24
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Ferreira JAB, Costa SMB. Electronic Excited-State Behavior of Rhodamine 3B in AOT Reverse Micelles Sensing Contact Ion Pair to Solvent Separated Ion Pair Interconversion. J Phys Chem B 2010; 114:10417-26. [DOI: 10.1021/jp100571t] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- José A. B. Ferreira
- Universidade Técnica de Lisboa, Instituto Superior Técnico, Centro de Química Estrutural, Complexo Interdisciplinar, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
| | - Sílvia M. B. Costa
- Universidade Técnica de Lisboa, Instituto Superior Técnico, Centro de Química Estrutural, Complexo Interdisciplinar, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
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25
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Affiliation(s)
- Indrek Renge
- Institute of Physics, University of Tartu, 142 Riia Street, EE51014 Tartu, Estonia
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26
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Pilzak G, van Gruijthuijsen K, van Doorn R, van Lagen B, Sudhölter E, Zuilhof H. Hybrid Conjugated Organic Oligomers Consisting of Oligodiacetylene and Thiophene Units: Synthesis and Optical Properties. Chemistry 2009; 15:9085-96. [DOI: 10.1002/chem.200900893] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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27
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Hydrogen-bonding molecular ruler surfactants as probes of specific solvation at liquid/liquid interfaces. Anal Bioanal Chem 2009; 395:1063-73. [DOI: 10.1007/s00216-009-2957-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Revised: 06/27/2009] [Accepted: 07/06/2009] [Indexed: 11/27/2022]
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28
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Brindza MR, Walker RA. Differentiating Solvation Mechanisms at Polar Solid/Liquid Interfaces. J Am Chem Soc 2009; 131:6207-14. [DOI: 10.1021/ja810117f] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Michael R. Brindza
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Robert A. Walker
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
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29
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Pilzak G, Baggerman J, van Lagen B, Posthumus M, Sudhölter E, Zuilhof H. Synthesis and Optoelectronic Properties of Nanometer-Sized and Highly Soluble Homocoupled Oligodiacetylenes. Chemistry 2009; 15:2296-304. [DOI: 10.1002/chem.200801119] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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30
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Silva PL, Pires PAR, Trassi MAS, Seoud OAE. Solvation in Pure Liquids: What Can Be Learned from the Use of Pairs of Indicators? J Phys Chem B 2008; 112:14976-84. [DOI: 10.1021/jp8067552] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Priscilla L. Silva
- Instituto de Química, Universidade de São Paulo, C.P. 26077, 05513-970 São Paulo, S.P., Brazil
| | - Paulo A. R. Pires
- Instituto de Química, Universidade de São Paulo, C.P. 26077, 05513-970 São Paulo, S.P., Brazil
| | - Marco A. S. Trassi
- Instituto de Química, Universidade de São Paulo, C.P. 26077, 05513-970 São Paulo, S.P., Brazil
| | - Omar A. El Seoud
- Instituto de Química, Universidade de São Paulo, C.P. 26077, 05513-970 São Paulo, S.P., Brazil
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31
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Matyushov DV. Non-Gaussian statistics of binding/unbinding events and the energetics of electron transfer reactions. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.03.028] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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32
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Renge I. Excited-state polarizability and gas phase frequency of the solvatochromic polarity indicator ET(30). Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.05.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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33
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34
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Caricato M, Mennucci B, Tomasi J. Solvent polarity scales revisited: a ZINDO-PCM study of the solvatochromism of betaine-30. Mol Phys 2007. [DOI: 10.1080/00268970500417994] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Marco Caricato
- a Scuola Normale Superiore , P.zza dei Cavalieri 7, 56126 Pisa, Italy
| | - Benedetta Mennucci
- b Dipartimento di Chimica e Chimica Industriale, Universitá di Pisa , Via Risorgimento 35, 56126 Pisa, Italy
| | - Jacopo Tomasi
- b Dipartimento di Chimica e Chimica Industriale, Universitá di Pisa , Via Risorgimento 35, 56126 Pisa, Italy
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35
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Stairs RA, Buncel E. Principal component analysis of solvent effects on equilibria and kinetics — A hemisphere model. CAN J CHEM 2006. [DOI: 10.1139/v06-160] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Principal Component Analysis (PCA) was applied to 17 selected properties relating to the properties of solvents and their effect on solute spectra and equilibria and rates of reactions in solution. The analysis showed affinities and contrasts among the parameters. Using the first three principal components (PC's) as unit vectors in the Cartesian directions, the properties were represented as vectors in this space with their directions being represented as points on the unit hemisphere; their magnitudes are lost in the process of correlation. Properties that fell into recognizable groups included the following: (i) those purporting to measure acidity (A) (α, AN, SA, and Aj), closely associated with ETN, Z, S, and A(14N), which are usually considered to be measures of polarity; (ii) properties supposed to measure basicity (B) (β, SB, and DN); (iii) polarity group (P), including pure (di-)polarity properties (βµ1/2 and Qv) and those measuring some combinations of polarity and polarizability (π*, πazo, SPP, and –χR). The space spanned by the three PCs of the properties provided a frame in which solvent effects on equilibria and on rates of reactions could be represented. Eight equilibria, represented by log10(K) measured in different solvents, and 10 reaction rates, similarly represented by log10(k), were correlated with the three PCs of the solvent properties. This enabled plotting of their directions in the hemisphere to show which groups of properties were most strongly correlated with the rate of each reaction. A separate plot showed the magnitudes and sense of the effects. These finding are considered in the light of the mechanisms proposed for the reactions.Key words: Chemometrics, Principal Component Analysis, solvent effects on equilibria and rates.
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36
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Satta M, Sanna N, Giardini A, Speranza M. Microsolvation effects on the π*←π electronic transitions in simple aromatic chromophores: The role of the Slater-type Gaussian orbitals in the complete active space self-consistent field approach. J Chem Phys 2006; 125:094101. [PMID: 16965066 DOI: 10.1063/1.2347712] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
One of the most studied feature of aromatic molecular clusters in the gas phase is the shift of the pi*<--pi electronic transitions between the bare aromatic chromophore and its clusters. In the present ab initio complete active space self-consistent field study the coupling of the basis set superposition error and counterpoise procedure and a combination of Pople- and Slater-type Gaussian basis sets has been proven to reproduce quantitatively the gas-phase experimental shifts. The quantal results are here analyzed with respect to the electrostatic and polarization forces and electron density differences, and connected with the sign of the shifts of the electronic transitions.
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Affiliation(s)
- Mauro Satta
- Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Via dei Taurini 19, 00185 Roma, Italy.
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37
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38
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Ghorai PK, Matyushov DV. Solvent reorganization of electron transitions in viscous solvents. J Chem Phys 2006; 124:144510. [PMID: 16626217 DOI: 10.1063/1.2185102] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
We develop a model of electron transfer reactions at conditions of nonergodicity when the time of solvent relaxation crosses the observation time window set up by the reaction rate. Solvent reorganization energy of intramolecular electron transfer in a charge-transfer molecule dissolved in water and acetonitrile is studied by molecular dynamics simulations at varying temperatures. We observe a sharp decrease of the reorganization energy at a temperature identified as the temperature of structural arrest due to cage effect, as discussed by the mode-coupling theory. This temperature also marks the onset of the enhancement of translational diffusion relative to rotational relaxation signaling the breakdown of the Stokes-Einstein relation. The change in the reorganization energy at the transition temperature reflects the dynamical arrest of the slow, collective relaxation of the solvent related to the relaxation of the solvent dipolar polarization. An analytical theory proposed to describe this effect agrees well with both the simulations and experimental Stokes shift data. The theory is applied to the analysis of charge-transfer kinetics in a low-temperature glass former. We show that the reorganization energy is substantially lower than its equilibrium value for the low-temperature portion of the data. The theory predicts the possibility of discontinuous changes in the dependence of the electron transfer rate on the free energy gap when the reaction switches between ergodic and nonergodic regimes.
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Affiliation(s)
- Pradip K Ghorai
- Department of Chemistry, Arizona State University, Tempe, Arizona 85287-1604, USA
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39
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Affiliation(s)
- Ilan Benjamin
- Department of Chemistry, University of California, Santa Cruz, California 95064, USA
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40
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Abstract
We present a microscopic theory of equilibrium solvation in solvents with zero dipole moment and nonzero quadrupole moment (quadrupolar solvents). The theory is formulated in terms of autocorrelation functions of the quadrupolar polarization (structure factors). It can be therefore applied to an arbitrary dense quadrupolar solvent for which the structure factors are defined. We formulate a simple analytical perturbation treatment for the structure factors. The solute is described by coordinates, radii, and partial charges of constituent atoms. The theory is tested on Monte Carlo simulations of solvation in model quadrupolar solvents. It is also applied to the calculation of the activation barrier of electron transfer reactions in a cleft-shaped donor-bridge-acceptor complex dissolved in benzene with the structure factors of quadrupolar polarization obtained from molecular-dynamics simulations.
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Affiliation(s)
- Anatoli A Milischuk
- Department of Chemistry and Biochemistry, Arizona State University, P.O. Box 871604, Tempe, Arizona 85287-1604, USA
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41
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Abstract
This paper reports measurements of static microscopic dielectric response of several dipolar solvents to charge redistribution in a fluorescent probe. Contrary to recent predictions of dielectric theories and computer simulations of bulk liquids, the observed dielectric response of most solvents conforms to the macroscopic continuum description even at atomic distances, as if these solvents had no spatial intermolecular structure. Such conformance is observed for several probes when the contribution of specific probe-solvent interactions to the response is negligible. However, water, formamide, and glycerol exhibit anomalous responses even though such a probe is used. We discuss a possible reason for the macroscopic-like behavior and a connection between the anomaly and fluctuating structures formed by anomalous solvents near the hydrophobic surface of the probe.
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Affiliation(s)
- Edward L Mertz
- National Institute of Child Health and Human Development, National Institutes of Health, Department of Health and Human Services, Bldg. 9, Rm. 1E125, Bethesda, Maryland 20892-0924, USA.
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Barto RR, Frank CW, Bedworth PV, Ermer S, Taylor RE. Near-Infrared Optical Absorption Behavior in High-β Nonlinear Optical Chromophore−Polymer Guest−Host Materials. 1. Continuum Dielectric Effects in Polycarbonate Hosts. J Phys Chem B 2004. [DOI: 10.1021/jp037239x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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43
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Katritzky AR, Fara DC, Yang H, Tämm K, Tamm T, Karelson M. Quantitative Measures of Solvent Polarity. Chem Rev 2004; 104:175-98. [PMID: 14719974 DOI: 10.1021/cr020750m] [Citation(s) in RCA: 262] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alan R Katritzky
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA
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44
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Zhang X, Steel WH, Walker RA. Probing Solvent Polarity across Strongly Associating Solid/Liquid Interfaces Using Molecular Rulers. J Phys Chem B 2003. [DOI: 10.1021/jp022067+] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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45
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Zhang X, Cunningham MM, Walker RA. Solvent Polarity at Polar Solid Surfaces: The Role of Solvent Structure. J Phys Chem B 2003. [DOI: 10.1021/jp021071i] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiaoyi Zhang
- Chemical Physics Program and Department of Chemistry and Biochemistry, University of MarylandCollege Park, College Park, Maryland 20742
| | - Margaret M. Cunningham
- Chemical Physics Program and Department of Chemistry and Biochemistry, University of MarylandCollege Park, College Park, Maryland 20742
| | - Robert A. Walker
- Chemical Physics Program and Department of Chemistry and Biochemistry, University of MarylandCollege Park, College Park, Maryland 20742
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46
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Vakarin EV, Holovko MF, Piotrowiak P. Ion-pairing effects in intramolecular electron transfer. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)01038-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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47
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Ercelen S, Klymchenko AS, Demchenko AP. Ultrasensitive fluorescent probe for the hydrophobic range of solvent polarities. Anal Chim Acta 2002. [DOI: 10.1016/s0003-2670(02)00493-2] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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48
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Zhao X, Knorr FJ, McHale JL. Temperature-dependent absorption spectrum of betaine-30 in methanol. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)00241-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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49
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Abbotto A, Bradamante S, Pagani GA. Pyridoneimines and pyridonemethides: substituent- and solvent-tunable intramolecular charge transfer and geometric isomerism. J Org Chem 2001; 66:8883-92. [PMID: 11749619 DOI: 10.1021/jo015937c] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have prepared and fully characterized by means of multinuclear NMR and UV-vis spectroscopy a series of pyridoneimines and pyridonemethides in order to show how it is possible to finely tune pi-electron structure properties by properly exploiting substituent and solvent effects. Substituents with different electron-withdrawing capacities were introduced in pyridoneimines 2-4, pyridonemethides 5 and 6, and pyridine sulfonamido derivatives 7-9. The anisochrony of the carbon position of the azinium ring (geometric isomerism) and the exploitation of previously reported (13)C and (15)N shift/pi-electron density relationships allowed the investigation of the extent of intramolecular charge transfer from the donor group to the acceptor pyridinium moiety. By combining different substitutions with the polarity of the surrounding media, we were able to access a whole range of push-pull electron structures in solution, from fully aromatic-zwitterionic to quinoid-neutral, through many possible intermediate situations along the path. Due to the strict correlation between the pi-electron structure of push-pull derivatives and many photonic properties such as nonlinear optical activity, we believe that the achieved results should be valuable for the development of new efficient, tailor-made, heteroaromatic systems with optimized features as advanced organic materials.
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Affiliation(s)
- A Abbotto
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via Cozzi 53, I-20125 Milan, Italy
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50
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Zhao X, Burt JA, Knorr FJ, McHale JL. Thermosolvatochromism of Betaine-30 in CH3CN. J Phys Chem A 2001. [DOI: 10.1021/jp012699g] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xihua Zhao
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844-2343
| | - Jim A. Burt
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844-2343
| | - Fritz J. Knorr
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844-2343
| | - Jeanne L. McHale
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844-2343
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