1
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Dalton BA, Kiefer H, Netz RR. The role of memory-dependent friction and solvent viscosity in isomerization kinetics in viscogenic media. Nat Commun 2024; 15:3761. [PMID: 38704367 PMCID: PMC11069540 DOI: 10.1038/s41467-024-48016-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 04/18/2024] [Indexed: 05/06/2024] Open
Abstract
Molecular isomerization kinetics in liquid solvent depends on a complex interplay between the solvent friction acting on the molecule, internal dissipation effects (also known as internal friction), the viscosity of the solvent, and the dihedral free energy profile. Due to the absence of accurate techniques to directly evaluate isomerization friction, it has not been possible to explore these relationships in full. By combining extensive molecular dynamics simulations with friction memory-kernel extraction techniques we consider a variety of small, isomerising molecules under a range of different viscogenic conditions and directly evaluate the viscosity dependence of the friction acting on a rotating dihedral. We reveal that the influence of different viscogenic media on isomerization kinetics can be dramatically different, even when measured at the same viscosity. This is due to the dynamic solute-solvent coupling, mediated by time-dependent friction memory kernels. We also show that deviations from the linear dependence of isomerization rates on solvent viscosity, which are often simply attributed to internal friction effects, are due to the simultaneous violation of two fundamental relationships: the Stokes-Einstein relation and the overdamped Kramers prediction for the barrier-crossing rate, both of which require explicit knowledge of friction.
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Affiliation(s)
| | - Henrik Kiefer
- Freie Universität Berlin, Fachbereich Physik, Berlin, Germany
| | - Roland R Netz
- Freie Universität Berlin, Fachbereich Physik, Berlin, Germany.
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2
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Chou TC, Temerova D, Wu CC, Tseng SM, Koshevoy IO, Chou PT. Photoinduced Aryl Transfer from Imidazolyl-Quinoline π-Conjugated Systems. J Am Chem Soc 2023; 145:18104-18114. [PMID: 37534396 DOI: 10.1021/jacs.3c06252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023]
Abstract
Aryl transfer between heteroatoms was photochemically available through radical initiation followed by a bimolecular reaction. However, such an excited-state reaction has rarely been reported through a photoinduced intramolecular pathway in the π-conjugated systems. Herein, we found, for the first time, a clean photoinduced intramolecular aryl shift for imidazolyl-quinoline derivatives 2NQ (imidazophenanthrene) and 4NQX (imidazophenanthroline), of which the photoproducts are thermally reversible. Upon light irradiation of the studied compounds in solution, an appreciable blue fluorescence along with a gradual change in color appearance was observed, the photoluminescence and photoconversion quantum yields of which were shown to be competitive in the same excited state. We were able to harness the photoconversion quantum yields of the NQ compounds with facile electronic modifications. These, in combination with time-resolved studies on the NQ compounds, gave an oxygen-insensitive aryl transfer rate within 1-100 ns. The anomalously slow intramolecular reaction rates were further proven to be associated with the ∼5.0 kcal/mol transition free energy. The photoproducts NQ_rs were isolated, identified by X-ray analyses, and also shown to demonstrate anti-Vavilov reverse reactions back to the NQ compounds in the higher-lying excited state. The discovery of photoinduced intramolecular aryl transfer paves a new pathway in the synthetic field, which may also be extended and far-reaching to solar-chemical storage under an appropriate design strategy.
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Affiliation(s)
- Tai-Che Chou
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - Diana Temerova
- Department of Chemistry, University of Eastern Finland, Joensuu 80101, Finland
| | - Chi-Chi Wu
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - Sheng-Ming Tseng
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - Igor O Koshevoy
- Department of Chemistry, University of Eastern Finland, Joensuu 80101, Finland
| | - Pi-Tai Chou
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617, Republic of China
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3
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Song C. State averaged CASSCF in AMOEBA polarizable water model for simulating nonadiabatic molecular dynamics with nonequilibrium solvation effects. J Chem Phys 2023; 158:014101. [PMID: 36610973 DOI: 10.1063/5.0131689] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
This paper presents a state-averaged complete active space self-consistent field (SA-CASSCF) in the atomic multipole optimized energetics for biomolecular application (AMOEBA) polarizable water model, which enables rigorous simulation of non-adiabatic molecular dynamics with nonequilibrium solvation effects. The molecular orbital and configuration interaction coefficients of the solute wavefunction, and the induced dipoles on solvent atoms, are solved by minimizing the state averaged energy variationally. In particular, by formulating AMOEBA water models and the polarizable continuum model (PCM) in a unified way, the algorithms developed for computing SA-CASSCF/PCM energies, analytical gradients, and non-adiabatic couplings in our previous work can be generalized to SA-CASSCF/AMOEBA by properly substituting a specific list of variables. Implementation of this method will be discussed with the emphasis on how the calculations of different terms are partitioned between the quantum chemistry and molecular mechanics codes. We will present and discuss results that demonstrate the accuracy and performance of the implementation. Next, we will discuss results that compare three solvent models that work with SA-CASSCF, i.e., PCM, fixed-charge force fields, and the newly implemented AMOEBA. Finally, the new SA-CASSCF/AMOEBA method has been interfaced with the ab initio multiple spawning method to carry out non-adiabatic molecular dynamics simulations. This method is demonstrated by simulating the photodynamics of the model retinal protonated Schiff base molecule in water.
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Affiliation(s)
- Chenchen Song
- Department of Chemistry, University of California Davis, Davis, California 95616, USA
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4
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Different timescales during ultrafast stilbene isomerization in the gas and liquid phases revealed using time-resolved photoelectron spectroscopy. Nat Chem 2022; 14:1126-1132. [PMID: 35953643 PMCID: PMC7613649 DOI: 10.1038/s41557-022-01012-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Accepted: 06/28/2022] [Indexed: 11/08/2022]
Abstract
Directly contrasting ultrafast excited-state dynamics in the gas and liquid phases is crucial to understanding the influence of complex environments. Previous studies have often relied on different spectroscopic observables, rendering direct comparisons challenging. Here, we apply extreme-ultraviolet time-resolved photoelectron spectroscopy to both gaseous and liquid cis-stilbene, revealing the coupled electronic and nuclear dynamics that underlie its isomerization. Our measurements track the excited-state wave packets from excitation along the complete reaction path to the final products. We observe coherent excited-state vibrational dynamics in both phases of matter that persist to the final products, enabling the characterization of the branching space of the S1-S0 conical intersection. We observe a systematic lengthening of the relaxation timescales in the liquid phase and a red shift of the measured excited-state frequencies that is most pronounced for the complex reaction coordinate. These results characterize in detail the influence of the liquid environment on both electronic and structural dynamics during a complete photochemical transformation.
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5
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Mendive‐Tapia L, Mendive‐Tapia D, Zhao C, Gordon D, Benson S, Bromley MJ, Wang W, Wu J, Kopp A, Ackermann L, Vendrell M. Rationales Design von Phe-BODIPY-Aminosäuren als fluorogene Bausteine für den peptidbasierten Nachweis von Candida-Infektionen im Harntrakt. ANGEWANDTE CHEMIE (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 134:e202117218. [PMID: 38505242 PMCID: PMC10946803 DOI: 10.1002/ange.202117218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Indexed: 11/08/2022]
Abstract
AbstractPilzinfektionen, die durch Candida‐Arten verursacht werden, gehören zu den häufigsten Infektionen bei Krankenhauspatienten. Die derzeitigen Methoden zum Nachweis von Candida‐Pilzzellen in klinischen Proben beruhen jedoch auf zeitaufwändigen Analysen, die eine schnelle und zuverlässige Diagnose erschweren. In diesem Beitrag beschreiben wir die rationale Entwicklung neuer Phe‐BODIPY‐Aminosäuren als kleine fluorogene Bausteine und ihre Anwendung zur Erzeugung fluoreszierender antimikrobieller Peptide für die schnelle Markierung von Candida‐Zellen im Urin. Mit Hilfe von computergestützten Berechnungen haben wir das fluorogene Verhalten von BODIPY‐substituierten aromatischen Aminosäuren analysiert und Bioaktivitäts‐ und konfokale Mikroskopieexperimente bei verschiedenen Stämmen durchgeführt, um den Nutzen und die Vielseitigkeit von Peptiden mit Phe‐BODIPYs zu bestätigen. Schließlich haben wir einen einfachen und sensitiven fluoreszensbasierten Test zum Nachweis von Candida albicans in menschlichen Urinproben entwickelt.
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Affiliation(s)
- Lorena Mendive‐Tapia
- Zentrum für EntzündungsforschungDie Universität von EdinburghEH16 4TJEdinburghGroßbritannien
| | - David Mendive‐Tapia
- Abteilung Theoretische ChemiePhysikalisch-Chemisches InstitutUniversität Heidelberg69120HeidelbergDeutschland
| | - Can Zhao
- Manchester Fungal Infection GroupAbteilung für EvolutionInfektion und GenomikM139NTManchesterGroßbritannien
| | - Doireann Gordon
- Zentrum für EntzündungsforschungDie Universität von EdinburghEH16 4TJEdinburghGroßbritannien
| | - Sam Benson
- Zentrum für EntzündungsforschungDie Universität von EdinburghEH16 4TJEdinburghGroßbritannien
| | - Michael J. Bromley
- Manchester Fungal Infection GroupAbteilung für EvolutionInfektion und GenomikM139NTManchesterGroßbritannien
| | - Wei Wang
- Institut für Organische und Biomolekulare ChemieGeorg-August-Universität37077GöttingenDeutschland
| | - Jun Wu
- Institut für Organische und Biomolekulare ChemieGeorg-August-Universität37077GöttingenDeutschland
| | - Adelina Kopp
- Institut für Organische und Biomolekulare ChemieGeorg-August-Universität37077GöttingenDeutschland
| | - Lutz Ackermann
- Institut für Organische und Biomolekulare ChemieGeorg-August-Universität37077GöttingenDeutschland
| | - Marc Vendrell
- Zentrum für EntzündungsforschungDie Universität von EdinburghEH16 4TJEdinburghGroßbritannien
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6
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Mendive‐Tapia L, Mendive‐Tapia D, Zhao C, Gordon D, Benson S, Bromley MJ, Wang W, Wu J, Kopp A, Ackermann L, Vendrell M. Rational Design of Phe‐BODIPY Amino Acids as Fluorogenic Building Blocks for Peptide‐Based Detection of Urinary Tract
Candida
Infections. Angew Chem Int Ed Engl 2022; 61:e202117218. [PMID: 35075763 PMCID: PMC9305947 DOI: 10.1002/anie.202117218] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Indexed: 12/11/2022]
Abstract
Fungal infections caused by Candida species are among the most prevalent in hospitalized patients. However, current methods for the detection of Candida fungal cells in clinical samples rely on time‐consuming assays that hamper rapid and reliable diagnosis. Herein, we describe the rational development of new Phe‐BODIPY amino acids as small fluorogenic building blocks and their application to generate fluorescent antimicrobial peptides for rapid labelling of Candida cells in urine. We have used computational methods to analyse the fluorogenic behaviour of BODIPY‐substituted aromatic amino acids and performed bioactivity and confocal microscopy experiments in different strains to confirm the utility and versatility of peptides incorporating Phe‐BODIPYs. Finally, we have designed a simple and sensitive fluorescence‐based assay for the detection of Candida albicans in human urine samples.
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Affiliation(s)
- Lorena Mendive‐Tapia
- Centre for Inflammation Research The University of Edinburgh EH16 4TJ Edinburgh UK
| | - David Mendive‐Tapia
- Department Theoretische Chemie Physikalisch-Chemisches Institut Universität Heidelberg 69120 Heidelberg Germany
| | - Can Zhao
- Manchester Fungal Infection Group Division of Evolution Infection and Genomics University of Manchester M139NT Manchester UK
| | - Doireann Gordon
- Centre for Inflammation Research The University of Edinburgh EH16 4TJ Edinburgh UK
| | - Sam Benson
- Centre for Inflammation Research The University of Edinburgh EH16 4TJ Edinburgh UK
| | - Michael J. Bromley
- Manchester Fungal Infection Group Division of Evolution Infection and Genomics University of Manchester M139NT Manchester UK
| | - Wei Wang
- Institut für Organische und Biomolekulare Chemie Georg-August-Universität 37077 Göttingen Germany
| | - Jun Wu
- Institut für Organische und Biomolekulare Chemie Georg-August-Universität 37077 Göttingen Germany
| | - Adelina Kopp
- Institut für Organische und Biomolekulare Chemie Georg-August-Universität 37077 Göttingen Germany
| | - Lutz Ackermann
- Institut für Organische und Biomolekulare Chemie Georg-August-Universität 37077 Göttingen Germany
| | - Marc Vendrell
- Centre for Inflammation Research The University of Edinburgh EH16 4TJ Edinburgh UK
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7
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Liu Q, Wang Z, Abe M. Impacts of Solvent and Alkyl Chain Length on the Lifetime of Singlet Cyclopentane-1,3-diyl Diradicaloids with π-Single Bonding. J Org Chem 2022; 87:1858-1866. [PMID: 35001629 DOI: 10.1021/acs.joc.1c02895] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The singlet 2,2-dialkoxycyclopentane-1,3-diyl diradicaloids are not only the important key intermediates in the process of bond homolysis but are also attracting attention as π-single bonding compounds. In the present study, the effects of solvent viscosity η (0.24-125.4 mPa s) and polarity π* (-0.11 to 1.00 kcal mol-1) on the reactivity of localized singlet diradicaloids were thoroughly investigated using 18 different solvents including binary mixed solvent systems containing ionic liquids. In low-η solvents (η < 1 mPa s), the lifetimes of singlet diradicaloids, which are determined by the rate constant for the isomerization of π-single-bonded singlet diradicaloids to the σ-bonded isomer, were substantially dependent on π*. Slower isomerization was observed in more polar solvents. In high-η solvents (η > 2 mPa s), the rate of isomerization was largely influenced by η in addition to π*. Slower isomerization was observed in more viscous solvents. Experimental results demonstrated the crucial roles of both solvent polarity and viscosity in the reactivity of singlet diradicaloids and thus clarified the characters of singlet diradicaloids and molecular motions during the chemical transformation. The dynamic solvent effect was further proved by a long alkyl chain introduced at a remote position of the reaction site.
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Affiliation(s)
- Qian Liu
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Zhe Wang
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Manabu Abe
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
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8
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van den Berg JL, Neumann KI, Harrison JA, Weir H, Hohenstein EG, Martinez TJ, Zare RN. Strong, Nonresonant Radiation Enhances Cis- Trans Photoisomerization of Stilbene in Solution. J Phys Chem A 2020; 124:5999-6008. [PMID: 32585098 DOI: 10.1021/acs.jpca.0c02732] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Previously, it has been demonstrated that external electric fields may be used to exert control over chemical reactivity. In this study, the impact of a strong, nonresonant IR field (1064 nm) on the photoisomerization of cis-stilbene is investigated in cyclohexane solution. The design of a suitable reaction vessel for characterization of this effect is presented. The electric field supplied by the pulsed, near-IR radiation (εl = 4.5 × 107 V/cm) enhances the cis → trans photoisomerization yield at the red edge of the absorption spectrum (wavelengths between 337 and 340 nm). Within the microliter focal volume, up to 75% of all cis-stilbene molecules undergo isomerization to trans-stilbene in the strong electric-field environment, indicating a significant increase relative to the 35% yield of trans-stilbene under field-free conditions. This result correlates with a 1-3% enhancement in the trans-stilbene concentration throughout the bulk solution. Theoretical analysis suggests that the observed change is the result of dynamic Stark shifting of the ground and first excited states, leading to a significant redshift in cis-stilbene's absorption spectrum. The predicted increase in the absorption cross section in this range of excitation wavelengths is qualitatively consistent with the experimental increase in trans-stilbene production.
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Affiliation(s)
- Jana L van den Berg
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Kallie Ilene Neumann
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - John A Harrison
- Department of Chemistry, Stanford University, Stanford, California 94305, United States.,Chemistry, School of Natural and Computational Sciences, Massey University Auckland, Private Bag 102904, Auckland 4442, New Zealand
| | - Hayley Weir
- Department of Chemistry, Stanford University, Stanford, California 94305, United States.,SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Edward G Hohenstein
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Todd J Martinez
- Department of Chemistry, Stanford University, Stanford, California 94305, United States.,SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Richard N Zare
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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9
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Akisaka R, Ohga Y, Abe M. Dynamic solvent effects in radical-radical coupling reactions: an almost bottleable localised singlet diradical. Phys Chem Chem Phys 2020; 22:27949-27954. [PMID: 33184617 DOI: 10.1039/d0cp05235c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Localised singlet diradicals are key intermediates in bond homolysis, which plays a crucial role in chemical reactions. However, thorough experimental analyses of the reaction dynamics and chemical properties are generally difficult because bond formation is rapid, even under low-temperature matrix conditions. In this study, the effects of solvent and pressure on the lifetimes of long-lived singlet diradicals with bulky substituents were investigated. The solvent dynamic effect was revealed to provide control over the rate constant of radical-radical coupling reactions, and an almost bottleable singlet diradical with a lifetime of ∼2 s at 293 K was obtained.
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Affiliation(s)
- Rikuo Akisaka
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
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10
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Das Mahanta D, Islam SI, Choudhury S, Das DK, Mitra RK, Barman A. Contrasting hydration dynamics in DME and DMSO aqueous solutions: A combined optical pump-probe and GHz-THz dielectric relaxation investigation. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111194] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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11
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Saltiel J, Gupta S. Photochemistry of the Stilbenes in Methanol. Trapping the Common Phantom Singlet State. J Phys Chem A 2018; 122:6089-6099. [DOI: 10.1021/acs.jpca.8b04011] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jack Saltiel
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
| | - Shipra Gupta
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
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12
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Bilal SM, Kayal S, Sanju KS, Adithya Lakshmanna Y. Femtosecond Time-Resolved Raman Spectroscopy Reveals Structural Evidence for meta Effect in Stilbenols. J Phys Chem A 2018; 122:4601-4608. [PMID: 29683672 DOI: 10.1021/acs.jpca.7b12339] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The meta effect in substituted aromatics plays a crucial role in their excited-state photophysical properties. Meta-substituted hydroxyarenes such as naphthols, stilbenols, and chromophoric constituents of green fluorescent proteins show unusual photoacidity and enhanced fluorescence lifetime and quantum yield when compared to their para-derivatives. Variation in the excited state features of the meta-derivatives when compared to the para-derivatives in stilbenols has been attributed to the enhanced torsional barrier for interconversion between the planar and the twisted perpendicular forms. Herein, we employed femtosecond time-resolved Raman spectroscopy to provide the direct structural evidence for the enhanced torsional barrier in meta-stilbenol. The Raman band profiles of the olefinic C═C stretch related to the torsional motion are found to decay with time constants of ∼750 and ∼13 ps in meta-stilbenol and para-stilbenol respectively, unraveling the structural evidence for the observed enhanced photoacidity originating from enhanced rates of excited-state proton transfer. Further, time-resolved fluorescence measurements are performed to elucidate the relaxation pathways of the excited states of the stilbenols.
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Affiliation(s)
- Syed M Bilal
- School of Chemistry , Indian Institute of Science Education and Research Thiruvananthapuram , Vithura, Thiruvananthapuram 695551 , India
| | - Surajit Kayal
- Department of Inorganic and Physical Chemistry , Indian Institute of Science , Bangalore 560012 , India
| | - Krishnankutty S Sanju
- School of Chemistry , Indian Institute of Science Education and Research Thiruvananthapuram , Vithura, Thiruvananthapuram 695551 , India
| | - Y Adithya Lakshmanna
- School of Chemistry , Indian Institute of Science Education and Research Thiruvananthapuram , Vithura, Thiruvananthapuram 695551 , India
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13
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Grimmelsmann L, Schuabb V, Tekin B, Winter R, Nuernberger P. Impact of kilobar pressures on ultrafast triazene and thiacyanine photodynamics. Phys Chem Chem Phys 2018; 20:18169-18175. [DOI: 10.1039/c8cp03334j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Application of high hydrostatic pressure leads to changes in (sub)picosecond emission dynamics, depending on the mechanism at work for the photoreaction.
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Affiliation(s)
| | - Vitor Schuabb
- Physikalische Chemie I – Biophysikalische Chemie
- Technische Universität Dortmund
- 44227 Dortmund
- Germany
| | - Beritan Tekin
- Physikalische Chemie II
- Ruhr-Universität Bochum
- 44780 Bochum
- Germany
| | - Roland Winter
- Physikalische Chemie I – Biophysikalische Chemie
- Technische Universität Dortmund
- 44227 Dortmund
- Germany
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14
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Harabuchi Y, Yamamoto R, Maeda S, Takeuchi S, Tahara T, Taketsugu T. Ab Initio Molecular Dynamics Study of the Photoreaction of 1,1′-Dimethylstilbene upon S0 → S1 Excitation. J Phys Chem A 2016; 120:8804-8812. [DOI: 10.1021/acs.jpca.6b07548] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yu Harabuchi
- Department
of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Rina Yamamoto
- Department
of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Satoshi Maeda
- Department
of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | | | | | - Tetsuya Taketsugu
- Department
of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
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15
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Quick M, Dobryakov AL, Ioffe IN, Granovsky AA, Kovalenko SA, Ernsting NP. Perpendicular State of an Electronically Excited Stilbene: Observation by Femtosecond-Stimulated Raman Spectroscopy. J Phys Chem Lett 2016; 7:4047-4052. [PMID: 27685655 DOI: 10.1021/acs.jpclett.6b01923] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In the photoisomerization path of stilbene, a perpendicular state P on the S1 potential energy surface is expected just before internal conversion through a conical intersection S1/S0. For decades the observation of P was thwarted by a short lifetime τP in combination with slow population flow over a barrier. But these limitations can be overcome by ethylenic substitution. Following optical excitation of trans-1,1'-dicyanostilbene, P is populated significantly (τP = 27 ps in n-hexane) and monitored by an exited-state absorption band at 370 nm. Here we report stimulated Raman lines of P. The strongest, at 1558 cm-1, is attributed to stretching vibrations of the phenyl rings. Transient electronic states, resonance conditions, and corresponding Raman signals are discussed.
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Affiliation(s)
- Martin Quick
- Department of Chemistry, Humboldt-Universität zu Berlin , Brook-Taylor-Str. 2, D-12489 Berlin, Germany
| | - Alexander L Dobryakov
- Department of Chemistry, Humboldt-Universität zu Berlin , Brook-Taylor-Str. 2, D-12489 Berlin, Germany
| | - Ilya N Ioffe
- Department of Chemistry, Lomonosov Moscow State University , Moscow 119991, Russia
| | | | - Sergey A Kovalenko
- Department of Chemistry, Humboldt-Universität zu Berlin , Brook-Taylor-Str. 2, D-12489 Berlin, Germany
| | - Nikolaus P Ernsting
- Department of Chemistry, Humboldt-Universität zu Berlin , Brook-Taylor-Str. 2, D-12489 Berlin, Germany
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16
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Saltiel J, Redwood CE. Photochemistry of the 1,4-Diphenyl-1,3-butadienes in Ethanol. Trapping Conical Intersections. J Phys Chem A 2016; 120:2832-40. [DOI: 10.1021/acs.jpca.6b02330] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jack Saltiel
- Department of Chemistry and
Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
| | - Christopher E. Redwood
- Department of Chemistry and
Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
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17
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Junginger A, Garcia-Muller PL, Borondo F, Benito RM, Hernandez R. Solvated molecular dynamics of LiCN isomerization: All-atom argon solvent versus a generalized Langevin bath. J Chem Phys 2016; 144:024104. [PMID: 26772551 DOI: 10.1063/1.4939480] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The reaction rate rises and falls with increasing density or friction when a molecule is activated by collisions with the solvent particles. This so-called Kramers turnover has recently been observed in the isomerization reaction of LiCN in an argon bath. In this paper, we demonstrate by direct comparison with those results that a reduced-dimensional (generalized) Langevin description gives rise to similar reaction dynamics as the corresponding (computationally expensive) full molecular dynamics calculations. We show that the density distributions within the Langevin description are in direct agreement with the full molecular dynamics results and that the turnover in the reaction rates is reproduced qualitatively and quantitatively at different temperatures.
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Affiliation(s)
- Andrej Junginger
- Center for Computational and Molecular Science and Technology, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA
| | - Pablo L Garcia-Muller
- Centro de Investigaciones Energéticas Medioambientales y Tecnológicas, Avda. Complutense 40, Madrid, Spain
| | - F Borondo
- Departamento de Química, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - R M Benito
- Grupo de Sistemas Complejos, Universidad Politécnica de Madrid and Departamento de Física y Mecánica, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Madrid, Spain
| | - Rigoberto Hernandez
- Center for Computational and Molecular Science and Technology, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA
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18
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Carreira-Blanco C, Singer P, Diller R, Luis Pérez Lustres J. Ultrafast deactivation of bilirubin: dark intermediates and two-photon isomerization. Phys Chem Chem Phys 2016; 18:7148-55. [DOI: 10.1039/c5cp06971h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Franck-Condon state A couples to the dark intermediate B, which shows tight molecular skeleton and distorted hydrogen bonding. B deactivates with nearly 100% efficiency. 2-Photon excitation at 400 nm triggers Z,E isomerization efficiently.
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Affiliation(s)
- Carlos Carreira-Blanco
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Department of Physical Chemistry
- Universidade de Santiago de Compostela
- E-15782 Santiago de Compostela
- Spain
| | - Patrick Singer
- Fachbereich Physik
- Technische Universität Kaiserslautern
- D-67663 Kaiserslautern
- Germany
| | - Rolf Diller
- Fachbereich Physik
- Technische Universität Kaiserslautern
- D-67663 Kaiserslautern
- Germany
| | - J. Luis Pérez Lustres
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Department of Physical Chemistry
- Universidade de Santiago de Compostela
- E-15782 Santiago de Compostela
- Spain
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19
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Harabuchi Y, Keipert K, Zahariev F, Taketsugu T, Gordon MS. Dynamics Simulations with Spin-Flip Time-Dependent Density Functional Theory: Photoisomerization and Photocyclization Mechanisms of cis-Stilbene in ππ* States. J Phys Chem A 2014; 118:11987-98. [DOI: 10.1021/jp5072428] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yu Harabuchi
- Department
of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Kristopher Keipert
- Department
of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Federico Zahariev
- Department
of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Tetsuya Taketsugu
- Department
of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Mark S. Gordon
- Department
of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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20
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Conyard J, Heisler IA, Browne WR, Feringa BL, Amirjalayer S, Buma WJ, Woutersen S, Meech SR. Ultrafast Excited State Dynamics in 9,9′-Bifluorenylidene. J Phys Chem A 2014; 118:5961-8. [DOI: 10.1021/jp504391s] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Jamie Conyard
- School
of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, U.K
| | - Ismael A. Heisler
- School
of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, U.K
| | - Wesley R. Browne
- Stratingh
Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
| | - Ben L. Feringa
- Stratingh
Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
| | - Saeed Amirjalayer
- Van’t Hoff Institute
for Molecular
Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
- Physical Institute
and Center for Nanotechnology (CeNTech), Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
| | - Wybren Jan Buma
- Van’t Hoff Institute
for Molecular
Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Sander Woutersen
- Van’t Hoff Institute
for Molecular
Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Stephen R. Meech
- School
of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, U.K
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21
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Molloy MS, Snyder JA, Bragg AE. Structural and Solvent Control of Nonadiabatic Photochemical Bond Formation: Photocyclization of o-Terphenyl in Solution. J Phys Chem A 2014; 118:3913-25. [DOI: 10.1021/jp501988g] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Molly S. Molloy
- Department
of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Joshua A. Snyder
- Department
of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Arthur E. Bragg
- Department
of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
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22
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Ioffe IN, Granovsky AA. Photoisomerization of Stilbene: The Detailed XMCQDPT2 Treatment. J Chem Theory Comput 2013; 9:4973-90. [PMID: 26583415 DOI: 10.1021/ct400647w] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the detailed XMCQDPT2/cc-pVTZ study of trans-cis photoisomerization in one of the core systems of both experimental and computational photochemistry-the stilbene molecule. For the first time, the potential energy surface (PES) of the S1 state has been directly optimized and scanned using a multistate multiconfiguration second-order perturbation theory. We characterize the trans-stilbene, pyramidalized (phantom), and DHP-cis-stilbene geometric domains of the S1 state and describe their stationary points including the transition states between them, as well as S1/S0 intersections. Also reported are the minima and the activation barriers in the ground state. Our calculations correctly predict the kinetic isotope effect due to H/D exchange at ethylenic hydrogens, the dynamic behavior of excited cis-stilbene, and trans-cis branching ratio after relaxation to S0 through a rather unsymmetric conical intersection. In general, the XMCQDPT2 results confirm the qualitative adequacy of the TDDFT (especially SF-TDDFT) picture of the excited stilbene but also reveal quantitative discrepancies that deserve further exploration.
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Affiliation(s)
- I N Ioffe
- Department of Chemistry, Lomonosov Moscow State University , Moscow, 119991, Russia
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23
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Lin N, Barone V, Cappelli C, Zhao X, Ruud K, Santoro F. Effective time-independent studies on resonance Raman spectroscopy of trans-stilbene including the Duschinsky effect. Mol Phys 2013. [DOI: 10.1080/00268976.2013.809490] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Na Lin
- a State Key Laboratory of Crystal Materials , Shandong University , Shandong , China
- b Centre for Theoretical and Computational Chemistry, Department of Chemistry , University of Tromsø , Tromsø , Norway
| | - Vincenzo Barone
- c Scuola Normale Superiore, Piazza dei Cavalieri 7 , Pisa , Italy
| | - Chiara Cappelli
- c Scuola Normale Superiore, Piazza dei Cavalieri 7 , Pisa , Italy
- d Dipartimento di Chimica e Chimica Industriale , Università di Pisa , Pisa , Italy
| | - Xian Zhao
- a State Key Laboratory of Crystal Materials , Shandong University , Shandong , China
| | - Kenneth Ruud
- b Centre for Theoretical and Computational Chemistry, Department of Chemistry , University of Tromsø , Tromsø , Norway
| | - Fabrizio Santoro
- e Consiglio Nazionale delle Ricerche – CNR, Istituto di Chimica dei Composti Organo Metallici (ICCOM-CNR) , Pisa , Italy
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24
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Tomasello G, Garavelli M, Orlandi G. Tracking the stilbene photoisomerization in the S1 state using RASSCF. Phys Chem Chem Phys 2013; 15:19763-73. [DOI: 10.1039/c3cp52310a] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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25
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Dobryakov AL, Ioffe I, Granovsky AA, Ernsting NP, Kovalenko SA. Femtosecond Raman spectra of cis-stilbene and trans-stilbene with isotopomers in solution. J Chem Phys 2012; 137:244505. [DOI: 10.1063/1.4769971] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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26
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Müller PLG, Hernandez R, Benito RM, Borondo F. Detailed study of the direct numerical observation of the Kramers turnover in the LiNC⇌LiCN isomerization rate. J Chem Phys 2012. [DOI: 10.1063/1.4766257] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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27
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Gao F, Ye X, Li H, Zhong X, Wang Q. Evidence for Two-Photon Absorption-Induced ESIPT of Chromophores Containing Hydroxyl and Imino Groups. Chemphyschem 2012; 13:1313-24. [DOI: 10.1002/cphc.201100885] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2011] [Indexed: 11/09/2022]
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28
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Alamiry MAH, Benniston AC, Copley G, Harriman A. Freezing and glass transition phenomena for 1,2-dichloroethane under high pressure as revealed by fluorescence spectroscopy. RSC Adv 2012. [DOI: 10.1039/c2ra00848c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
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29
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Nakamura T, Takeuchi S, Taketsugu T, Tahara T. Femtosecond fluorescence study of the reaction pathways and nature of the reactive S1 state of cis-stilbene. Phys Chem Chem Phys 2012; 14:6225-32. [DOI: 10.1039/c2cp23959k] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Takumi Nakamura
- Molecular Spectroscopy Laboratory, RIKEN, 2-1, Hirosawa, Wako 351-0198, Japan
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30
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Minezawa N, Gordon MS. Photoisomerization of stilbene: a spin-flip density functional theory approach. J Phys Chem A 2011; 115:7901-11. [PMID: 21639100 DOI: 10.1021/jp203803a] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The photoisomerization process of 1,2-diphenylethylene (stilbene) is investigated using the spin-flip density functional theory (SFDFT), which has recently been shown to be a promising approach for locating conical intersection (CI) points (Minezawa, N.; Gordon, M. S. J. Phys. Chem. A2009, 113, 12749). The SFDFT method gives valuable insight into twisted stilbene to which the linear response time-dependent DFT approach cannot be applied. In contrast to the previous SFDFT study of ethylene, a distinct twisted minimum is found for stilbene. The optimized structure has a sizable pyramidalization angle and strong ionic character, indicating that a purely twisted geometry is not a true minimum. In addition, the SFDFT approach can successfully locate two CI points: the twisted-pyramidalized CI that is similar to the ethylene counterpart and another CI that possibly lies on the cyclization pathway of cis-stilbene. The mechanisms of the cis--trans isomerization reaction are discussed on the basis of the two-dimensional potential energy surface along the twisting and pyramidalization angles.
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Affiliation(s)
- Noriyuki Minezawa
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA
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31
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Kee TW, Adhikary R, Carlson PJ, Mukherjee P, Petrich JW. Femtosecond Fluorescence Upconversion Investigations on the Excited-State Photophysics of Curcumin. Aust J Chem 2011. [DOI: 10.1071/ch10417] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The demonstration of curcumin as a photodynamic therapy agent has generated a high level of interest in understanding the photoinduced chemical and physical properties of this naturally occurring, yellow-orange medicinal compound. Important photophysical processes that may be related to photodynamic therapy effects including excited-state intramolecular hydrogen atom transfer (ESIHT) occur within the femtosecond to picosecond time scales. Femtosecond fluorescence upconversion spectroscopy has sufficient time resolution to resolve and investigate these important photophysical processes. In this review, recent advances in using femtosecond fluorescence upconversion to reveal ultrafast solvation and ESIHT of curcumin are presented. The excited-state photophysics of curcumin has been investigated in alcohols and micellar solutions. The results of curcumin in methanol and ethylene glycol reveal the presence of two decay components in the excited-state kinetics with time scales of 12–20 ps and ∼100 ps. Similarly, in a micellar solution, biphasic kinetics are present with the fast decay component having a time constant of 3–8 ps, the slow decay component 50–80 ps. Deuteration of curcumin in both media leads to a pronounced isotope effect in the slow decay component, which suggests that ESIHT is an important photophysical process on this time scale. The results of multiwavelength fluorescence upconversion studies show that the fast component in the excited-state kinetics is due to ultrafast solvation. These advances form a part of the continuing efforts to elucidate the photodynamic therapy properties of curcumin.
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32
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Schroeder J. Picosecond kinetics of trans-cis-photoisomerisations: From jet-cooled molecules to compressed solutions. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19971010402] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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33
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Kovalenko S, Dobryakov A, Ioffe I, Ernsting N. Evidence for the phantom state in photoinduced cis–trans isomerization of stilbene. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.05.022] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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34
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Weigel A, Ernsting N. Excited Stilbene: Intramolecular Vibrational Redistribution and Solvation Studied by Femtosecond Stimulated Raman Spectroscopy. J Phys Chem B 2010; 114:7879-93. [DOI: 10.1021/jp100181z] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- A. Weigel
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany
| | - N.P. Ernsting
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany
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35
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Nikowa L, Schroeder J, Schwarzer D, Troe J. First steps of energy loss of vibrationally highly excited trans-stilbene in compressed liquid solvents. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19940980223] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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36
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Sajadi M, Dobryakov A, Garbin E, Ernsting N, Kovalenko S. Time-resolved fluorescence spectra of cis-stilbene in hexane and acetonitrile. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.02.034] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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37
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Gomes R, Laia CAT, Pina F. On the Mechanism of Photochromism of 4′-N,N-Dimethylamino-7-hydroxyflavylium in Pluronic F127. J Phys Chem B 2009; 113:11134-46. [DOI: 10.1021/jp902972q] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Raquel Gomes
- REQUIMTE, Departamento de Química, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - César A. T. Laia
- REQUIMTE, Departamento de Química, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Fernando Pina
- REQUIMTE, Departamento de Química, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
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38
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Dou Y, Wu W, Tang H, Allen RE. Ultrafast laser excitation and rotational de-excitation of cis-stilbene. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.07.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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39
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García-Müller PL, Borondo F, Hernandez R, Benito RM. Solvent-induced acceleration of the rate of activation of a molecular reaction. PHYSICAL REVIEW LETTERS 2008; 101:178302. [PMID: 18999793 DOI: 10.1103/physrevlett.101.178302] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2008] [Indexed: 05/27/2023]
Abstract
An increase in the rates of activated processes with the coupling to the solvent has long been predicted through the phenomenological Langevin equation in the weak coupling regime. However, its direct observation in particle-based models has been elusive because the coupling typically places the processes in the spacial-diffusion limited regime wherein rates decrease with increasing friction. In this work, the forward and backward reaction rates of the LiNC<==>LiCN isomerization reaction in a bath of argon atoms at various densities have been calculated directly using molecular dynamics trajectories. The so-called Kramers turnover in the rate with microscopic friction is clearly visible, thus providing direct and unambiguous evidence for the energy-diffusion regime in which rates increase with friction.
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Affiliation(s)
- P L García-Müller
- Departamento Química and Instituto Mixto de Ciencias Matemáticas CSIC-UAM-UC3M-UCM, Universidad Autónoma de Madrid, Cantoblanco, Madrid, Spain
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40
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Colonna A, Yabushita A, Iwakura I, Kobayashi T. Chirped molecular vibration in a stilbene derivative in solution. Chem Phys 2007. [DOI: 10.1016/j.chemphys.2007.08.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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41
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Guo X, Wang S, Xia A, Su H. Determination of the Formation of Dark State via Depleted Spontaneous Emission in a Complex Solvated Molecule. J Phys Chem A 2007; 111:5800-5. [PMID: 17559198 DOI: 10.1021/jp070531a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present a general two-color two-pulse femtosecond pump-dump approach to study the specific population transfer along the reaction coordinate through the higher vibrational energy levels of excited states of a complex solvated molecule via the depleted spontaneous emission. The time-dependent fluorescence depletion provides the correlated dynamical information between the monitored fluorescence state and the SEP "dumped" dark states, and therefore allow us to obtain the dynamics of the formation of the dark states corresponding to the ultrafast photoisomerization processes. The excited-state dynamics of LDS 751 have been investigated as a function of solvent viscosity and solvent polarity, where a cooperative two-step isomerization process is clearly identified within LDS 751 upon excitation.
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Affiliation(s)
- Xunmin Guo
- The State Key Laboratory of Molecular Reaction Dynamics, and Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
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42
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Görner H, Kuhn HJ. Cis-TransPhotoisomerization of Stilbenes and Stilbene-Like Molecules. ADVANCES IN PHOTOCHEMISTRY 2007. [DOI: 10.1002/9780470133507.ch1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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43
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Mondal JA, Ghosh HN, Ghanty TK, Mukherjee T, Palit DK. Twisting Dynamics in the Excited Singlet State of Michler's Ketone. J Phys Chem A 2006; 110:3432-46. [PMID: 16526622 DOI: 10.1021/jp0555450] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ultrafast relaxation dynamics of the excited singlet (S(1)) state of Michler's ketone (MK) has been investigated in different kinds of solvents using a time-resolved absorption spectroscopic technique with 120 fs time resolution. This technique reveals that conversion of the locally excited (LE) state to the twisted intramolecular charge transfer (TICT) state because of twisting of the N,N-dimethylanilino groups with respect to the central carbonyl group is the major relaxation process responsible for the multi-exponential and probe-wavelength-dependent transient absorption dynamics of the S1 state of MK, but solvation dynamics does not have a significant role in this process. Theoretical optimization of the ground-state geometry of MK shows that the dimethylanilino groups attached to the central carbonyl group are at a dihedral angle of about 51 degrees with respect to each other because of steric interaction between the phenyl rings. Following photoexcitation of MK to its S1 state, two kinds of twisting motions have been resolved. Immediately after photoexcitation, an ultrafast "anti-twisting" motion of the dimethylanilino groups brings back the pretwisted molecule to a near-planar geometry with high mesomeric interaction and intramolecular charge transfer (ICT) character. This motion is observed in all kinds of solvents. Additionally, in solvents of large polarity, the dimethylamino groups undergo further twisting to about 90 degrees with respect to the phenyl ring, to which it is attached, leading to the conversion of the ICT state to the TICT state. Similar characteristics of the absorption spectra of the TICT state and the anion radical of MK establish the nearly pure electron transfer (ET) character of the TICT state. In aprotic solvents, because of the steep slope of the potential energy surface near the Franck-Condon (FC) or LE state region, the LE state is nearly nonemissive at room temperature and fluorescence emission is observed from only the ICT and TICT states. Alternatively, in protic solvents, because of an intermolecular hydrogen-bonding interaction between MK and the solvent, the LE region is more flat and stimulated emission from this state is also observed. However, a stronger hydrogen-bonding interaction between the TICT state and the solvent as well as the closeness between the two potential energy surfaces due to the TICT and the ground states cause the nonradiative coupling between these states to be very effective and, hence, cause the TICT state to be weakly emissive. The multi-exponentiality and strong wavelength-dependence of the kinetics of the relaxation process taking place in the S1 state of MK have arisen for several reasons, such as strong overlapping of transient absorption and stimulated emission spectra of the LE, ICT, and TICT states, which are formed consecutively following photoexcitation of the molecule, as well as the fact that different probe wavelengths monitor different regions of the potential energy surface representing the twisting motion of the excited molecule.
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Affiliation(s)
- Jahur A Mondal
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
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44
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Improta R, Santoro F. Excited-State Behavior of trans and cis Isomers of Stilbene and Stiff Stilbene: A TD-DFT Study. J Phys Chem A 2005; 109:10058-67. [PMID: 16838925 DOI: 10.1021/jp054250j] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first part of the isomerization path on the two lowest excited states of trans and cis isomers of stilbene and stiff stilbene is investigated by means of TD-PBE0 calculations in the gas phase and in heptane solution. Solvent effects are taken into account by the PCM model. The excited-state optimized structures and the computed absorption and emission frequencies are in good agreement with the available experimental results. In all of the examined compounds, the isomerization process before barrier crossing occurs on the HOMO --> LUMO bright state, whereas the role played by other single-excitation states appears negligible. The relative energy barriers on the isomerization paths are consistent with the experimental excited-state lifetimes, suggesting a unifying picture of the isomerization process in stilbene-like molecules.
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Affiliation(s)
- R Improta
- Istituto di Biostrutture e Biommagini del CNR, via Mezzocannone 6, I-80134 Napoli, Italy.
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Nakabayashi T, Wahadoszamen M, Ohta N. External Electric Field Effects on State Energy and Photoexcitation Dynamics of Diphenylpolyenes. J Am Chem Soc 2005; 127:7041-52. [PMID: 15884948 DOI: 10.1021/ja0401444] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
External electric field effects on state energy and photoexcitation dynamics have been examined for para-substituted and unsubstituted all-trans-diphenylpolyenes doped in a film, based on the steady-state and picosecond time-resolved measurements of the field effects on absorption and fluorescence. The substitution dependence of the electroabsorption spectra shows that the dipole moment of the substituted stilbene in the Franck-Condon excited state becomes larger with increasing difference between the Hammet constants of the substituents. Fluorescence quantum yields of 4-(dimethylamino)-4'-nitrostilbene and 4-(dimethylamino)-4'-nitrodiphenylbutadiene are markedly reduced by an electric field, suggesting that the rates of the intramolecular charge transfer (CT) from the fluorescent state to the nonradiative CT state are accelerated by an external electric field. The magnitude of the field-induced decrease in fluorescence lifetime has been evaluated. The isomerization of the unsubstituted all-trans-diphenylpolyenes to the cis forms is shown to be a significant nonradiative pathway even in a film. Field-induced quenching of their fluorescence as well as field-induced decrease in fluorescence lifetime suggests that the trans to cis photoisomerization is enhanced by an electric field.
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Affiliation(s)
- Takakazu Nakabayashi
- Research Institute for Electronic Science (RIES), Hokkaido University, Sapporo 060-0812, Japan.
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Dietl C, Papastathopoulos E, Niklaus P, Improta R, Santoro F, Gerber G. Femtosecond photoelectron spectroscopy of trans-stilbene above the reaction barrier. Chem Phys 2005. [DOI: 10.1016/j.chemphys.2004.10.028] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Pancur T, Renth F, Temps F, Harbaum B, Krüger A, Herges R, Näther C. Femtosecond fluorescence up-conversion spectroscopy of a rotation-restricted azobenzene after excitation to the S1state. Phys Chem Chem Phys 2005; 7:1985-9. [DOI: 10.1039/b419236b] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ishii K, Takeuchi S, Tahara T. A 40-fs time-resolved absorption study on cis-stilbene in solution: observation of wavepacket motion on the reactive excited state. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.09.075] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Singh AK, Ramakrishna G, Ghosh HN, Palit DK. Photophysics and Ultrafast Relaxation Dynamics of the Excited States of Dimethylaminobenzophenone. J Phys Chem A 2004. [DOI: 10.1021/jp037132+] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Wahadoszamen M, Nakabayashi T, Ohta N. Electric field effects on photoisomerization process of diphenylpolyenes doped in a polymer film as revealed by a field-induced change in fluorescence spectrum. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.01.107] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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