51
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Tomin VI, Demchenko AP, Chou PT. Thermodynamic vs. kinetic control of excited-state proton transfer reactions. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2015. [DOI: 10.1016/j.jphotochemrev.2014.09.005] [Citation(s) in RCA: 139] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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52
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Wang Y, Shi Y, Cong L, Li H. TDDFT study of twisted intramolecular charge transfer and intermolecular double proton transfer in the excited state of 4'-dimethylaminoflavonol in ethanol solvent. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 137:913-918. [PMID: 25282020 DOI: 10.1016/j.saa.2014.09.024] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Revised: 08/24/2014] [Accepted: 09/11/2014] [Indexed: 06/03/2023]
Abstract
Time-dependent density functional theory method at the def-TZVP/B3LYP level was employed to investigate the intramolecular and intermolecular hydrogen bonding dynamics in the first excited (S1) state of 4'-dimethylaminoflavonol (DMAF) monomer and in ethanol solution. In the DMAF monomer, we demonstrated that the intramolecular charge transfer (ICT) takes place in the S1 state. This excited state ICT process was followed by intramolecular proton transfer. Our calculated results are in good agreement with the mechanism proposed in experimental work. For the hydrogen-bonded DMAF-EtOH complex, it was demonstrated that the intermolecular hydrogen bonds can induce the formation of the twisted intramolecular charge transfer (TICT) state and the conformational twisting is along the C3-C4 bond. Moreover, the intermolecular hydrogen bonds can also facilitate the intermolecular double proton transfer in the TICT state. A stepwise intermolecular double proton transfer process was revealed. Therefore, the intermolecular hydrogen bonds can alter the mechanism of intramolecular charge transfer and proton transfer in the excited state for the DMAF molecule.
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Affiliation(s)
- Ye Wang
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
| | - Ying Shi
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
| | - Lin Cong
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
| | - Hui Li
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
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53
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Stasyuk AJ, Cyrański MK, Gryko DT, Solà M. Acidic C–H Bond as a Proton Donor in Excited State Intramolecular Proton Transfer Reactions. J Chem Theory Comput 2015; 11:1046-54. [DOI: 10.1021/ct501100t] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Anton J. Stasyuk
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
- Department
of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Michał K. Cyrański
- Department
of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Daniel T. Gryko
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
- Institute of Organic Chemistry of the Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Miquel Solà
- Institut
de Química Computacional i Catàlisi and Departament
de Química, Universitat de Girona, Campus Montilivi, 17071 Girona, Catalonia, Spain
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54
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Chipem FAS, Malakar A, Krishnamoorthy G. Intramolecular Proton Transfer in 2-(2′-hydroxyphenyl)oxazolo[4,5-b]pyridine: Evidence for Tautomer in the Ground State. Photochem Photobiol 2015; 91:298-305. [DOI: 10.1111/php.12411] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2014] [Accepted: 12/14/2014] [Indexed: 01/19/2023]
Affiliation(s)
- Francis A. S. Chipem
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati India
| | - Ashim Malakar
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati India
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55
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Gutierrez M, Alarcos N, Liras M, Sánchez F, Douhal A. Switching to a Reversible Proton Motion in a Charge-Transferred Dye. J Phys Chem B 2015; 119:552-62. [DOI: 10.1021/jp511345z] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Mario Gutierrez
- Departamento
de Química Física, Facultad de Ciencias Ambientales
y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N., 45071 Toledo, Spain
| | - Noemí Alarcos
- Departamento
de Química Física, Facultad de Ciencias Ambientales
y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N., 45071 Toledo, Spain
| | - Marta Liras
- Instituto
de Química Orgánica General, IQOG-CSIC, Juan de la
Cierva, 3, 28006 Madrid, Spain
| | - Félix Sánchez
- Instituto
de Química Orgánica General, IQOG-CSIC, Juan de la
Cierva, 3, 28006 Madrid, Spain
| | - Abderrazzak Douhal
- Departamento
de Química Física, Facultad de Ciencias Ambientales
y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N., 45071 Toledo, Spain
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56
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Tasaki S, Momotake A, Kanna Y, Sato T, Nishimura Y, Arai T. Producing a dual-fluorescent molecule by tuning the energetics of excited-state intramolecular proton transfer. Photochem Photobiol Sci 2015. [PMID: 26219627 DOI: 10.1039/c5pp00088b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We report herein the selective preparation of normal, tautomeric, and dual-fluorescent molecules with a common ESIPT core.
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Affiliation(s)
- Satomi Tasaki
- Graduate School of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Atsuya Momotake
- Graduate School of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Yoko Kanna
- Faculty of Science
- University of the Ryukyus
- Nishihara
- Japan
| | - Tomoo Sato
- Graduate School of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Yoshinobu Nishimura
- Graduate School of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Tatsuo Arai
- Graduate School of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba
- Japan
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57
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Barthes NPF, Karpenko IA, Dziuba D, Spadafora M, Auffret J, Demchenko AP, Mély Y, Benhida R, Michel BY, Burger A. Development of environmentally sensitive fluorescent and dual emissive deoxyuridine analogues. RSC Adv 2015. [DOI: 10.1039/c5ra02709h] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
We designed and developed fluorescent deoxyuridine analogues with strong sensitivity to hydration for the major groove labelling of DNA.
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Affiliation(s)
- N. P. F. Barthes
- Institut de Chimie de Nice
- UMR 7272
- Université de Nice Sophia Antipolis
- CNRS
- 06108 Nice Cedex 2
| | - I. A. Karpenko
- Institut de Chimie de Nice
- UMR 7272
- Université de Nice Sophia Antipolis
- CNRS
- 06108 Nice Cedex 2
| | - D. Dziuba
- Institut de Chimie de Nice
- UMR 7272
- Université de Nice Sophia Antipolis
- CNRS
- 06108 Nice Cedex 2
| | - M. Spadafora
- Institut de Chimie de Nice
- UMR 7272
- Université de Nice Sophia Antipolis
- CNRS
- 06108 Nice Cedex 2
| | - J. Auffret
- Institut de Chimie de Nice
- UMR 7272
- Université de Nice Sophia Antipolis
- CNRS
- 06108 Nice Cedex 2
| | | | - Y. Mély
- Laboratoire de Biophotonique et Pharmacologie
- UMR 7213
- Faculté de Pharmacie
- Université de Strasbourg
- CNRS
| | - R. Benhida
- Institut de Chimie de Nice
- UMR 7272
- Université de Nice Sophia Antipolis
- CNRS
- 06108 Nice Cedex 2
| | - B. Y. Michel
- Institut de Chimie de Nice
- UMR 7272
- Université de Nice Sophia Antipolis
- CNRS
- 06108 Nice Cedex 2
| | - A. Burger
- Institut de Chimie de Nice
- UMR 7272
- Université de Nice Sophia Antipolis
- CNRS
- 06108 Nice Cedex 2
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58
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Gong Y, Lu Y, Ma H, Ding G, Zhang S, Luo Z, Li H, Gao F. Efficient enhancement of internal proton transfer of branched π-extended organic chromophore under one-photon and near-infrared two-photon irradiation. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2014.12.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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59
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Houari Y, Chibani S, Jacquemin D, Laurent AD. TD-DFT Assessment of the Excited State Intramolecular Proton Transfer in Hydroxyphenylbenzimidazole (HBI) Dyes. J Phys Chem B 2014; 119:2180-92. [DOI: 10.1021/jp505036d] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ymène Houari
- Laboratoire
CEISAM - UMR CNR 6230, Université de Nantes, 2 Rue de la
Houssinière, BP 92208, 44322 Nantes Cedex 3, France
| | - Siwar Chibani
- Laboratoire
CEISAM - UMR CNR 6230, Université de Nantes, 2 Rue de la
Houssinière, BP 92208, 44322 Nantes Cedex 3, France
| | - Denis Jacquemin
- Laboratoire
CEISAM - UMR CNR 6230, Université de Nantes, 2 Rue de la
Houssinière, BP 92208, 44322 Nantes Cedex 3, France
- Institut Universitaire
de France, 103, bd Saint-Michel, F-75005 Paris Cedex 05, France
| | - Adèle D. Laurent
- Laboratoire
CEISAM - UMR CNR 6230, Université de Nantes, 2 Rue de la
Houssinière, BP 92208, 44322 Nantes Cedex 3, France
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60
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Dziuba D, Karpenko IA, Barthes NPF, Michel BY, Klymchenko AS, Benhida R, Demchenko AP, Mély Y, Burger A. Rational Design of a Solvatochromic Fluorescent Uracil Analogue with a Dual-Band Ratiometric Response Based on 3-Hydroxychromone. Chemistry 2014; 20:1998-2009. [DOI: 10.1002/chem.201303399] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Indexed: 12/24/2022]
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61
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Das R, Duportail G, Ghose A, Richert L, Klymchenko A, Chakraborty S, Yesylevskyy S, Mely Y. Tuning excited-state proton transfer dynamics of a 3-hydroxychromone dye in supramolecular complexes via host–guest steric compatibility. Phys Chem Chem Phys 2014; 16:776-84. [DOI: 10.1039/c3cp52597j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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62
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Yang W, Chen X. Dual fluorescence of excited state intra-molecular proton transfer of HBFO: mechanistic understanding, substituent and solvent effects. Phys Chem Chem Phys 2014; 16:4242-50. [DOI: 10.1039/c3cp54462a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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63
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Demchenko AP, Tang KC, Chou PT. Excited-state proton coupled charge transfer modulated by molecular structure and media polarization. Chem Soc Rev 2013; 42:1379-408. [PMID: 23169387 DOI: 10.1039/c2cs35195a] [Citation(s) in RCA: 452] [Impact Index Per Article: 41.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Charge and proton transfer reactions in the excited states of organic dyes can be coupled in many different ways. Despite the complementarity of charges, they can occur on different time scales and in different directions of the molecular framework. In certain cases, excited-state equilibrium can be established between the charge-transfer and proton-transfer species. The interplay of these reactions can be modulated and even reversed by variations in dye molecular structures and changes of the surrounding media. With knowledge of the mechanisms of these processes, desired rates and directions can be achieved, and thus the multiple emission spectral features can be harnessed. These features have found versatile applications in a number of cutting-edge technological areas, particularly in fluorescence sensing and imaging.
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Affiliation(s)
- Alexander P Demchenko
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha street, Kiev 01030, Ukraine.
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64
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Klymchenko AS, Mely Y. Fluorescent environment-sensitive dyes as reporters of biomolecular interactions. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2013; 113:35-58. [PMID: 23244788 DOI: 10.1016/b978-0-12-386932-6.00002-8] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Monitoring biomolecular interactions is a fundamental issue in biosensing, with numerous applications ranging from biological research to clinical diagnostics. Fluorescent dyes capable of changing their color and brightness in response to changes of their environment properties, the so-called environment-sensitive dyes, have recently emerged as reporters of these interactions. The most well established of these are dyes that undergo excited-state charge transfer showing red shift of their single emission band with increase in the solvent polarity. The other promising class are dyes of the 3-hydroxychromone family that undergo excited-state intramolecular proton transfer and show solvent-sensitive dual emission. Examples of existing solvatochromic dyes and their biosensing applications are given, with particular focus on the 3-hydroxychromones. It is shown that solvatochromic dyes are powerful tools for monitoring conformation changes of proteins and their interactions with nucleic acids, proteins, and lipid membranes.
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Affiliation(s)
- Andrey S Klymchenko
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, Illkirch Cedex, France
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65
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Doroshenko AO, Matsakov AY, Nevskii OV, Grygorovych OV. Excited state intramolecular proton transfer reaction revisited: S1 state or general reversibility? J Photochem Photobiol A Chem 2012. [DOI: 10.1016/j.jphotochem.2012.09.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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66
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Demchenko AP. Beyond annexin V: fluorescence response of cellular membranes to apoptosis. Cytotechnology 2012; 65:157-72. [PMID: 22797774 DOI: 10.1007/s10616-012-9481-y] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2012] [Accepted: 06/24/2012] [Indexed: 02/07/2023] Open
Abstract
Dramatic changes in the structure of cell membranes on apoptosis allow easy, sensitive and non-destructive analysis of this process with the application of fluorescence methods. The strong plasma membrane asymmetry is present in living cells, and its loss on apoptosis is commonly detected with the probes interacting strongly and specifically with phosphatidylserine (PS). This phospholipid becomes exposed to the cell surface, and the application of annexin V labeled with fluorescent dye is presently the most popular tool for its detection. Several methods have been suggested recently that offer important advantages over annexin V assay with the ability to study apoptosis by spectroscopy of cell suspensions, flow cytometry and confocal or two-photon microscopy. The PS exposure marks the integrated changes in the outer leaflet of cell membrane that involve electrostatic potential and hydration, and the attempts are being made to provide direct probing of these changes. This review describes the basic mechanisms underlying the loss of membrane asymmetry during apoptosis and discusses, in comparison with the annexin V-binding assay, the novel fluorescence techniques of detecting apoptosis on cellular membrane level. In more detail we describe the detection method based on smart fluorescent dye F2N12S incorporated into outer leaflet of cell membrane and reporting on apoptotic cell transformation by easily detectable change of the spectral distribution of fluorescent emission. It can be adapted to any assay format.
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Affiliation(s)
- Alexander P Demchenko
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, Kiev, 01030, Ukraine,
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67
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Kenfack CA, Klymchenko AS, Duportail G, Burger A, Mély Y. Ab initio study of the solvent H-bonding effect on ESIPT reaction and electronic transitions of 3-hydroxychromone derivatives. Phys Chem Chem Phys 2012; 14:8910-8. [PMID: 22641242 DOI: 10.1039/c2cp40869d] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electronic transitions occurring in 4-(N,N-dimethylamino)-3-hydroxyflavone (DMAF) and 2-furanyl-3-hydroxychromone (FHC) were investigated using the TDDFT method in aprotic and protic solvents. The solvent effect was incorporated into the calculations via the PCM formalism. The H-bonding between solute and protic solvent was taken into account by considering a molecular complex between these molecules. To examine the effect of the H-bond on the ESIPT reaction, the absorption and emission wavelengths as well as the energies of the different states that intervene during these electronic transitions were calculated in acetonitrile, ethanol and methanol. The calculated positions of the absorption and emission wavelengths in various solvents were in excellent agreement with the experimental spectra, validating our approach. We found that in DMAF, the hydrogen bonding with protic solvents makes the ESIPT reaction energetically unfavourable, which explains the absence of the ESIPT tautomer emission in protic solvents. In contrast, the excited tautomer state of FHC remains energetically favourable in both aprotic and protic solvents. Comparing our calculations with the previously reported time-resolved fluorescence data, the ESIPT reaction of DMAF in aprotic solvents is reversible because the emitting states are energetically close, whereas in FHC, ESIPT is irreversible because the tautomer state is below the corresponding normal state. Therefore, the ESIPT reaction in DMAF is controlled by the relative energies of the excited states (thermodynamic control), while in FHC the ESIPT is controlled probably by the energetic barrier (kinetic control).
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Affiliation(s)
- Cyril A Kenfack
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 du CNRS, Faculté de Pharmacie, Université de Strasbourg, 74, Route du Rhin, 67401 Illkirch Cedex, France.
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68
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Giordano L, Shvadchak VV, Fauerbach JA, Jares-Erijman EA, Jovin TM. Highly Solvatochromic 7-Aryl-3-hydroxychromones. J Phys Chem Lett 2012; 3:1011-1016. [PMID: 26286565 DOI: 10.1021/jz3002019] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Introduction of the dialkylaminophenyl group in position 7 of 3-hydroxychromone changes the orientation of the excited-state dipole moment and leads to superior solvatochromic properties (>170 nm emission shift in aprotic media). The excited-state intramolecular proton-transfer (ESIPT) reaction of 7-aryl-3-hydroxychromones is almost completely inhibited in most solvents. Methylation of the 3-OH abolishes ESIPT completely and also leads to improved photostability. The probes exhibit a ∼100-fold increase in fluorescence intensity and large Stokes shifts upon binding to membranes, reflecting differences in membrane phase and charge by a >40 nm spread in the emission band position.
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Affiliation(s)
- Luciana Giordano
- †Laboratory for Cellular Dynamics, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, Göttingen, Germany
| | - Volodymyr V Shvadchak
- †Laboratory for Cellular Dynamics, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, Göttingen, Germany
| | - Jonathan A Fauerbach
- ‡Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Elizabeth A Jares-Erijman
- ‡Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Thomas M Jovin
- †Laboratory for Cellular Dynamics, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, Göttingen, Germany
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69
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Pivovarenko VG, Zamotaiev OM, Shvadchak VV, Postupalenko VY, Klymchenko AS, Mély Y. Quantification of local hydration at the surface of biomolecules using dual-fluorescence labels. J Phys Chem A 2012; 116:3103-9. [PMID: 22394312 DOI: 10.1021/jp2101732] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
By using four labels of the 3-hydroxyflavone family displaying selective sensitivity to hydrogen bond (HB) donors and poor response to other polar molecules, we developed an approach for measuring local water concentration [H(2)O](L) (or partial volume of water: W(A) = [H(2)O](L)/55.6) in the label surrounding both in solvent mixtures and in biomolecules by the intensity ratio of two emissive forms of the label, N*/T*. Using a series of binary water/solvent mixtures with limited preferential solvation effects, a linear dependence of log(N*/T*) on the local concentration of HB donor was obtained and then used as a calibration curve for estimating the W(A) values in the surroundings of the probes conjugated to biomolecules. By this approach, we estimated the hydration of the labels in different peptides and their complexes with DNAs. We found that W(A) values for the label at the peptide N-terminus are lower (0.63-0.91) than for free labels and depend strongly on the nature of the N-terminal amino acid. When complexed with different DNAs, the estimated hydration of the labels conjugated to the labeled peptides was much lower (W(A) = 0-0.47) and depended on the DNA nature and linker-label structure. Thus, the elaborated method allows a site-specific evaluation of hydration at the surface of a biomolecule through the determination of the partial volume of water. We believe the developed procedure can be successfully applied for monitoring hydration at the surface of any biomolecule or nanostructure.
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Affiliation(s)
- Vasyl G Pivovarenko
- Organic Chemistry Chair, Chemistry Faculty, Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine
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70
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Kucherak OA, Richert L, Mély Y, Klymchenko AS. Dipolar 3-methoxychromones as bright and highly solvatochromic fluorescent dyes. Phys Chem Chem Phys 2012; 14:2292-300. [DOI: 10.1039/c2cp23037b] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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71
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Klymchenko AS, Duportail G, Mély Y. 3-Hydroxychromone Probes Precisely Located and Oriented in Lipid Bilayers: A Toolkit for Biomembrane Research. SPRINGER SERIES ON FLUORESCENCE 2012. [DOI: 10.1007/4243_2012_44] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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72
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Tang KC, Chang MJ, Lin TY, Pan HA, Fang TC, Chen KY, Hung WY, Hsu YH, Chou PT. Fine tuning the energetics of excited-state intramolecular proton transfer (ESIPT): white light generation in a single ESIPT system. J Am Chem Soc 2011; 133:17738-45. [PMID: 21957929 DOI: 10.1021/ja2062693] [Citation(s) in RCA: 390] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Using 7-hydroxy-1-indanone as a prototype (I), which exhibits excited-state intramolecular proton transfer (ESIPT), chemical modification has been performed at C(2)-C(3) positions by fusing benzene (molecule II) and naphthalene rings, (molecule III). I undergoes an ultrafast rate of ESIPT, resulting in a unique tautomer emission (λ(max) ∼530 nm), whereas excited-state equilibrium is established for both II and III, as supported by the dual emission and the associated relaxation dynamics. The forward ESIPT (normal to proton-transfer tautomer species) rates for II and III are deduced to be (30 ps)(-1) and (22 ps)(-1), respectively, while the backward ESIPT rates are (11 ps)(-1) and (48 ps)(-1). The ESIPT equilibrium constants are thus calculated to be 0.37 and 2.2 for II and III, respectively, giving a corresponding free energy change of 0.59 and -0.47 kcal/mol between normal and tautomer species. For III, normal and tautomer emissions in solid are maximized at 435 and 580 nm, respectively, achieving a white light generation with Commission Internationale de l'Eclairage (CIE) (0.30, 0.27). An organic light-emitting diode based on III is also successfully fabricated with maximum brightness of 665 cd m(-2) at 20 V (885 mA cm(-2)) and the CIE coordinates of (0.26, 0.35). The results provide the proof of concept that the white light generation can be achieved in a single ESIPT system.
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Affiliation(s)
- Kuo-Chun Tang
- Department of Chemistry, National Taiwan University, Taipei, 10617 Taiwan, ROC
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73
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Bura T, Hablot D, Ziessel R. Fluorescent boron dipyrromethene (Bodipy) dyes having two and four vinyl residues. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.02.094] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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74
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Xia B, Gerard B, Solano DM, Wan J, Jones G, Porco JA. ESIPT-mediated photocycloadditions of 3-hydroxyquinolinones: development of a fluorescence quenching assay for reaction screening. Org Lett 2011; 13:1346-9. [PMID: 21338078 DOI: 10.1021/ol200032f] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Irradiation of 1,2-dimethyl-3-hydroxyquinolinone (DMQ) leads to excited state intramolecular proton transfer (ESIPT) generating a 3-oxidoquinolinium species which undergoes [3 + 2] photocycloaddition with dipolarophiles. A parallel, fluorescence quenching assay using a microplate format has been developed to evaluate fluorescence quenching of this species with a range of dipolarophiles.
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Affiliation(s)
- Bing Xia
- Department of Chemistry, Photonics Center, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
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75
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Roche SP, Cencic R, Pelletier J, Porco JA. Biomimetic photocycloaddition of 3-hydroxyflavones: synthesis and evaluation of rocaglate derivatives as inhibitors of eukaryotic translation. Angew Chem Int Ed Engl 2011; 49:6533-8. [PMID: 20687060 DOI: 10.1002/anie.201003212] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Stéphane P Roche
- Department of Chemistry, Center for Chemical Methodology and Library Development (CMLD-BU), Boston University, 590 Commonwealth Avenue, Boston MA, 02215, USA
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76
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Morris C, Szczupak B, Klymchenko AS, Ryder AG. Study of Water Adsorption in Poly(N-isopropylacrylamide) Thin Films Using Fluorescence Emission of 3-Hydroxyflavone Probes. Macromolecules 2010. [DOI: 10.1021/ma102152j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cheryl Morris
- Nanoscale Biophotonics Laboratory, School of Chemistry, National University of Ireland, Galway, Galway, Ireland
| | - Boguslaw Szczupak
- Nanoscale Biophotonics Laboratory, School of Chemistry, National University of Ireland, Galway, Galway, Ireland
| | - Andrey S. Klymchenko
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 74, Route du Rhin, 67401 ILLKIRCH Cedex, France
| | - Alan G. Ryder
- Nanoscale Biophotonics Laboratory, School of Chemistry, National University of Ireland, Galway, Galway, Ireland
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77
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Hsieh CC, Jiang CM, Chou PT. Recent experimental advances on excited-state intramolecular proton coupled electron transfer reaction. Acc Chem Res 2010; 43:1364-74. [PMID: 20954751 DOI: 10.1021/ar1000499] [Citation(s) in RCA: 256] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Proton-coupled electron transfer reactions form the basis of many important chemical processes including much of the energy conversion that occurs within living cells. However, much of the physical chemistry that underlies these reaction mechanisms remains poorly understood. In this Account, we report on recent progress in the understanding of excited-state intramolecular proton-coupled electron transfer (PCET) reactions. The strategic design and synthesis of various types of PCET molecules, along with steady-state and femtosecond time-resolved spectroscopy, have uncovered the mechanisms of several excited-state PCET reactions in solution. These experimental advancements correlate well with current theoretical models, in which the proton has quantum motion with a high probability of tunneling. In addition, the rate of proton transfer is commonly incorporated within the rate of rearrangement of solvent molecules. As a result, the reaction activation free energy is essentially governed by the solvent reorganization because the charge redistribution is considered based on a solvent polarity-induced barrier instead of the height of the proton migration barrier. In accord with this theoretical basis, we can rationalize the observation that the proton transfer for many excited-state PCET systems occurs during the solvent relaxation time scale of 1-10 ps: the highly exergonic reaction takes place before the system reaches its equilibrium polarization. Also, we have used various derivatives of proton transfer molecules, especially those of 3-hydroxyflavone to clearly demonstrate how researchers can tune the dynamics of excited-state PCET through changes in the magnitude or direction of the dipole vector within the reaction. Subsequently, using 2-(2'-hydroxyphenyl)benzoxazole as the parent model, we then report on methods for the development of an ideal system for probing PCET reaction. Because future biomedical applications of such systems will likely occur in aqueous environments, we discuss various 7-azaindole analogues, for which proton transfer requires the assistance of protic solvent molecules. These results provide a unique contrast to the ubiquitous studies on the dynamic solvent effects of PCET molecules that undergo intrinsic intramolecular proton motion.
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Affiliation(s)
- Cheng-Chih Hsieh
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan, Republic of China
| | - Chang-Ming Jiang
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan, Republic of China
| | - Pi-Tai Chou
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan, Republic of China
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78
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Lin CC, Chen CL, Chung MW, Chen YJ, Chou PT. Effects of Multibranching on 3-Hydroxyflavone-Based Chromophores and the Excited-State Intramolecular Proton Transfer Dynamics. J Phys Chem A 2010; 114:10412-20. [DOI: 10.1021/jp105542z] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chao-Chen Lin
- Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, R.O.C
| | - Chyi-Lin Chen
- Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, R.O.C
| | - Min-Wen Chung
- Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, R.O.C
| | - Yi-Ju Chen
- Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, R.O.C
| | - Pi-Tai Chou
- Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, R.O.C
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79
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Kimura Y, Fukuda M, Suda K, Terazima M. Excited State Intramolecular Proton Transfer Reaction of 4′-N,N-Diethylamino-3-hydroxyflavone and Solvation Dynamics in Room Temperature Ionic Liquids Studied by Optical Kerr Gate Fluorescence Measurement. J Phys Chem B 2010; 114:11847-58. [DOI: 10.1021/jp105033q] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Yoshifumi Kimura
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Masanori Fukuda
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Kayo Suda
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Masahide Terazima
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
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80
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Roche S, Cencic R, Pelletier J, Porco J. Biomimetic Photocycloaddition of 3-Hydroxyflavones: Synthesis and Evaluation of Rocaglate Derivatives as Inhibitors of Eukaryotic Translation. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201003212] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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81
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Polarity Assessment of Thermoresponsive Poly(NIPAM-co-NtBA) Copolymer Films Using Fluorescence Methods. J Fluoresc 2010; 20:719-31. [DOI: 10.1007/s10895-010-0613-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2009] [Accepted: 02/07/2010] [Indexed: 10/19/2022]
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82
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Tomin VI. The influence of temperature and dynamic quenching on the properties of 3-hydroxyflavone excited states. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2010. [DOI: 10.1134/s1990793109060025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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83
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Organic Dyes with Excited-State Transformations (Electron, Charge, and Proton Transfers). SPRINGER SERIES ON FLUORESCENCE 2010. [DOI: 10.1007/978-3-642-04702-2_7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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84
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Tomin VI. Proton transfer in 3-hydroxyflavone: The influence of physical excitation conditions and dynamic quenching. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2009. [DOI: 10.1134/s0036024410010218] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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85
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3-Hydroxybenzo[g]quinolones: dyes with red-shifted absorption and highly resolved dual emission. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.06.024] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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86
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Demchenko AP, Mély Y, Duportail G, Klymchenko AS. Monitoring biophysical properties of lipid membranes by environment-sensitive fluorescent probes. Biophys J 2009; 96:3461-70. [PMID: 19413953 DOI: 10.1016/j.bpj.2009.02.012] [Citation(s) in RCA: 301] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2009] [Revised: 02/11/2009] [Accepted: 02/17/2009] [Indexed: 01/21/2023] Open
Abstract
We review the main trends in the development of fluorescence probes to obtain information about the structure, dynamics, and interactions in biomembranes. These probes are efficient for studying the microscopic analogs of viscosity, polarity, and hydration, as well as the molecular order, environment relaxation, and electrostatic potentials at the sites of their location. Progress is being made in increasing the information content and spatial resolution of the probe responses. Multichannel environment-sensitive probes that can distinguish between different membrane physicochemical properties through multiple spectroscopic parameters show considerable promise.
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87
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Das R, Klymchenko AS, Duportail G, Mély Y. Unusually slow proton transfer dynamics of a 3-hydroxychromone dye in protic solvents. Photochem Photobiol Sci 2009; 8:1583-9. [DOI: 10.1039/b906710h] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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88
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Towrie M, Parker AW, Ronayne KL, Bowes KF, Cole JM, Raithby PR, Warren JE. A time-resolved infrared vibrational spectroscopic study of the photo-dynamics of crystalline materials. APPLIED SPECTROSCOPY 2009; 63:57-65. [PMID: 19146719 DOI: 10.1366/000370209787169902] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Time-resolved infrared vibrational spectroscopy is a structurally sensitive probe of the excited-state properties of matter. The technique has found many applications in the study of molecules in dilute solution phase but has rarely been applied to crystalline samples. We report on the use of a sensitive pump-probe time-resolved infrared spectrometer and sample handling techniques for studies of the ultrafast excited-state dynamics of crystalline materials. The charge transfer excited states of crystalline metal carbonyls and the proton transfer of dihydroxyquinones are presented and compared with the solution phase.
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Affiliation(s)
- Mike Towrie
- Central Laser Facility, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 OQX, United Kingdom.
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89
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Bilokin’ MD, Shvadchak VV, Yushchenko DA, Duportail G, Mély Y, Pivovarenko VG. Dual-Fluorescence Probe of Environment Basicity (Hydrogen Bond Accepting Ability) Displaying no Sensitivity to Polarity. J Fluoresc 2008; 19:545-53. [PMID: 19020962 DOI: 10.1007/s10895-008-0443-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2008] [Accepted: 11/11/2008] [Indexed: 10/21/2022]
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90
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Hsieh CC, Chen KY, Hsieh WT, Lai CH, Shen JY, Jiang CM, Duan HS, Chou PT. Cyano Analogues of 7-Azaindole: Probing Excited-State Charge-Coupled Proton Transfer Reactions in Protic Solvents. Chemphyschem 2008; 9:2221-9. [DOI: 10.1002/cphc.200800352] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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91
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Das R, Klymchenko AS, Duportail G, Mély Y. Excited State Proton Transfer and Solvent Relaxation of a 3-Hydroxyflavone Probe in Lipid Bilayers. J Phys Chem B 2008; 112:11929-35. [DOI: 10.1021/jp804956u] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ranjan Das
- Photophysique des Interactions Biomoléculaires, UMR 7175 du CNRS, Institut Gilbert Laustriat, Faculté de Pharmacie, Université Louis Pasteur, 67401 Illkirch, France, and Department of Chemistry, Bijoy Krishna Girls’ College, Howrah, West Bengal, India
| | - Andrey S. Klymchenko
- Photophysique des Interactions Biomoléculaires, UMR 7175 du CNRS, Institut Gilbert Laustriat, Faculté de Pharmacie, Université Louis Pasteur, 67401 Illkirch, France, and Department of Chemistry, Bijoy Krishna Girls’ College, Howrah, West Bengal, India
| | - Guy Duportail
- Photophysique des Interactions Biomoléculaires, UMR 7175 du CNRS, Institut Gilbert Laustriat, Faculté de Pharmacie, Université Louis Pasteur, 67401 Illkirch, France, and Department of Chemistry, Bijoy Krishna Girls’ College, Howrah, West Bengal, India
| | - Yves Mély
- Photophysique des Interactions Biomoléculaires, UMR 7175 du CNRS, Institut Gilbert Laustriat, Faculté de Pharmacie, Université Louis Pasteur, 67401 Illkirch, France, and Department of Chemistry, Bijoy Krishna Girls’ College, Howrah, West Bengal, India
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92
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Hsieh CC, Cheng YM, Hsu CJ, Chen KY, Chou PT. Spectroscopy and Femtosecond Dynamics of Excited-State Proton Transfer Induced Charge Transfer Reaction. J Phys Chem A 2008; 112:8323-32. [DOI: 10.1021/jp804216u] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Cheng-Chih Hsieh
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan, Republic of China
| | - Yi-Ming Cheng
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan, Republic of China
| | - Chia-Jung Hsu
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan, Republic of China
| | - Kew-Yu Chen
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan, Republic of China
| | - Pi-Tai Chou
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan, Republic of China
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93
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Embaye NB, Ramini SK, Kuzyk MG. Mechanisms of reversible photodegradation in disperse orange 11 dye doped in PMMA polymer. J Chem Phys 2008; 129:054504. [DOI: 10.1063/1.2963502] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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94
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Klymchenko AS, Demchenko AP. Chapter 3 Multiparametric Probing of Microenvironment with Solvatochromic Fluorescent Dyes. Methods Enzymol 2008; 450:37-58. [DOI: 10.1016/s0076-6879(08)03403-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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95
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Klymchenko AS, Yushchenko DA, Mély Y. Tuning excited state intramolecular proton transfer in 3-hydroxyflavone derivative by reaction of its isothiocyanate group with an amine. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2007.05.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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96
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97
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Yushchenko DA, Shvadchak VV, Klymchenko AS, Duportail G, Pivovarenko VG, Mély Y. Modulation of excited-state intramolecular proton transfer by viscosity in protic media. J Phys Chem A 2007; 111:10435-8. [PMID: 17910424 DOI: 10.1021/jp074726u] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
3-Hydroxyquinolones undergo excited-state intramolecular proton transfer (ESIPT), resulting in a dual emission highly sensitive to H-bonding perturbations. Here, we report on the strong effect of viscosity on the dual emission of 2-(2-thienyl)-3-hydroxyquinolone in protic solvents. An increase in viscosity significantly decreases the formation of the ESIPT product, thus changing dramatically the ratio of the two emission bands. Time-resolved studies suggest the presence of solvated species characterized by decay times close to the solvent relaxation times in viscous media. The intramolecular H bond in this species is probably disrupted by the solvent, and therefore, its ESIPT requires a reorganization of the solvation shell for restoring this intramolecular H bond. Thus, the ESIPT reaction of this dye and its dual emission depend on solvent relaxation rates and, therefore, on viscosity. The present results suggest a new physical principle for the fluorescence ratiometric measurement of local viscosity.
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Affiliation(s)
- Dmytro A Yushchenko
- Photophysique des Interactions Biomoléculaires, UMR 7175-LC1 du CNRS, Institut Gilbert Laustriat, Faculté de Pharmacie, Université Louis Pasteur, 67401 Illkirch, France.
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98
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Sanz M, Organero J, Douhal A. Proton and charge transfer reactions dynamics of a hydroxyflavone derivative in a polar solvent and in a cyclodextrin nanocavity. Chem Phys 2007. [DOI: 10.1016/j.chemphys.2007.04.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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99
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Yushchenko DA, Shvadchak VV, Klymchenko AS, Duportail G, Pivovarenko VG, Mély Y. Steric control of the excited-state intramolecular proton transfer in 3-hydroxyquinolones: steady-state and time-resolved fluorescence study. J Phys Chem A 2007; 111:8986-92. [PMID: 17718453 DOI: 10.1021/jp071075t] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
3-Hydroxyquinolones (3HQs), similarly to their 3-hydroxychromone analogs, undergo excited state intramolecular proton transfer (ESIPT) resulting in dual emission. In the ground state, 2-phenyl-3HQ derivatives are not flat due to a steric hindrance between the 2-phenyl group and the 3-OH group that participates in the ESIPT reaction. To study the effect of this steric hindrance on the ESIPT reaction, a number of 3HQ derivatives have been synthesized and characterized in different organic solvents by steady-state and time-resolved fluorescence techniques. According to our results, 2-phenyl-3HQ derivatives undergo much faster ESIPT (by nearly 1 order of magnitude) than their 2-methyl-3HQ analogs. Moreover, 1-methyl-2-phenyl-3HQ having a strongly twisted 2-phenyl group undergoes a two- to three-fold slower ESIPT compared to 2-phenyl-3HQ. These results suggest that the flatter conformation of 2-phenyl-3HQ, which allows a close proximity of the 2-phenyl and 3-OH groups, favors a fast ESIPT reaction. The absorption and fluorescence spectra of the 3HQ derivatives additionally confirm that the steric rather than the electronic effect of the 2-phenyl group is responsible for the faster ESIPT reaction. Based on the spectroscopic studies and quantum chemical calculations, we suggest that the 2-phenyl group decreases the rotational freedom of its proximal 3-OH group in the more planar conformation of 2-phenyl-3HQ. As a result, the conformations of 3HQ, where the 3-OH group orients to form an intramolecular H-bond with the 4-carbonyl group, are favored over those with a disrupted intramolecular H-bond. Therefore, the 2-phenyl group sterically favors the intramolecular H-bond and thus accelerates the ESIPT reaction. This conclusion provides a new understanding of the ESIPT process in 3-hydroxyquinolones and related systems and suggests new possibilities for the design of ESIPT based molecular sensors and switchers.
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Affiliation(s)
- Dmytro A Yushchenko
- Department of Chemistry, Kyiv National Taras Shevchenko University, 01033 Kyiv, Ukraine.
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100
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Smoluch M, Joshi H, Gerssen A, Gooijer C, van der Zwan G. Fast excited-state intramolecular proton transfer and subnanosecond dynamic stokes shift of time-resolved fluorescence spectra of the 5-methoxysalicylic acid/diethyl ether complex. J Phys Chem A 2007; 109:535-41. [PMID: 16833377 DOI: 10.1021/jp0475281] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Excited-state intramolecular proton transfer (ESIPT) occurring in the salicylic acid (SA) derivative 5-methoxysalicylic acid (5-MeOSA) in an apolar solvent (cyclohexane) and in the presence of the hydrogen bond accepting agent diethyl ether (DEE) is investigated. Analysis of the directly measured subnanosecond time-resolved emission spectra (TRES) together with conventional steady-state fluorescence and time-correlated single-photon-counting (TCSPC) decays indicates that ESIPT in this system occurs much faster than fluorescence, and that the equilibrium between normal and tautomeric excited states is established before the emission from both states takes place. However, changes in time- and frequency-resolved fluorescence of the 5-MeOSA/DEE complex are observed due to structural relaxation within the complex, which is reflected in the dynamic Stokes shift of the tautomeric fluorescence band. The normal fluorescence band of 5-MeOSA/DEE does not exhibit marked changes within the investigated time range. A single-exponential relaxation time of 460 ps was determined for the dynamic Stokes shift of the tautomeric band, and it is attributed to a geometric change within the 5-MeOSA/DEE complex upon excitation. Since both tautomeric and normal emission bands are well resolved and exhibit different time-dependent behaviors, a double-well potential appears to be adequate to describe the excited state of the system studied.
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Affiliation(s)
- Mirosława Smoluch
- Department of Analytical Chemistry and Applied Spectroscopy, Laser Centre VU, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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