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Femtosecond study on the isomerization dynamics of NK88. II. Excited-state dynamics (115 visite)

Vogt G, Nuernberger P, Gerber G, Improta R, Santoro F, Nuernberger P, Vogt G, Gerber G, Improta R, Santoro F

J Chem Phys (ISSN: 0021-9606, 0897-690online), 2006 Jul 28; 125(4): 44512-44512.

Tipo di articolo: Abstract, Conference, Research Support, Non-U. S. Gov'T,

Impact factor: 3.166

Impact factor a 5 anni: 3.142


Parole chiave: Absorption Spectroscopy, Electric Excitation, Fluorescence, Ground State, Isomerization, Probability Density Function, Density Functional Theory, Fluorescence Upconversion, Photoisomers, Wavelength, Molecular Dynamics, Diethyl 2, Thiacyanine, -Diethyl-2, -Thiacyanine, 5 Fluoro 2 Thiocytosine, 5-Fluoro-2-Thiocytosine, Carbocyanine, Drug Derivative, Ethylene Glycol, Methanol, Anisotropy, Article, Chemical Structure, Chemistry, Computer Program, Conformation, Laser, Light, Methodology, Photochemistry, Spectrophotometry, Temperature, Thermodynamics, Models, Molecular Conformation, Software, Time Factors, Phase Equilibria, Molecular Systems, Photoisomerization, Plesset Perturbation Theory Calculations, Statistical Model, Cytosine Analogs, Derivatives Chemistry, Ethylene Glycol Chemistry, Methanol Chemistry, Photochemistry Methods, Carbocyanines Chemistry,

Url: http://www.scopus.com/inward/record.url?eid=2-s2.0-33746810021&partnerID=40&md5=bd32b97065afb77748fc8fdac612d3fc

The molecule 3,3′-diethyl-2,2′-thiacyanine isomerizes after irradiation with light of the proper wavelength. After excitation, it undergoes a transition, in which one or more conical intersections are involved, back to the ground state to form different product photoisomers. The dynamics before and directly after the transition back to the ground state is investigated by transient absorption spectroscopy in a wavelength region of 360-950 nm, as well as by fluorescence upconversion. It is shown that the excited-state dynamics are governed by two time scales: a short one with a decay time of less than 2 ps and a long one with about 9 ps. A thorough comparison of the experimental results with those of configuration interaction singles and time-dependent density functional theory calculations suggests that these dynamics are related to two competing pathways differing in the molecular twisting on the excited surface after photoexcitation. From the experimental point of view this picture arises taking into account the time scales for ground-state bleach, excited-state absorption, stimulated emission, fluorescence, and assumed hot ground-state absorption both in the solvent methanol and ethylene glycol. © 2006 American Institute of Physics.
*** IBB - CNR ***

Physikalisches Institut, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

Istituto di Biostrutture e Biommagini, CNR, via Mezzocannone 6, I-80134 Napoli, Italy

Istituto per i Processi Chimico-Fisici, CNR, CNR di Pisa, Area della Ricerca, via Moruzzi 1, I-56124 Pisa, Italy
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Gustavsson T, Sarkar N, Lazzarotto E, Markovitsi D, Improta R
* Singlet excited state dynamics of uracil and thymine derivatives: A femtosecond fluorescence upconversion study in acetonitrile (78 visite)
Chemical Physics Letters (ISSN: 0009-2614), 2006 Oct 5; 429(4-6): 551-557.
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Nuernberger P, Vogt G, Gerber G, Improta R, Santoro F
* Femtosecond study on the isomerization dynamics of NK88. I. Ground-state dynamics after photoexcitation (94 visite)
J Chem Phys (ISSN: 0021-9606, 0021-9606print, 0897-690online), 2006 Jul 28; 125(4): 44512-44544.
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Gustavsson T, Lazzarotto E, Markovitsi D, Banyasz AA, Improta R, Scalmani G
* A combined femtosecond fluorescence and TD-DFT study of uracil derivatives in aqueous solution (83 visite)
Femtochemistry Vii Elsevier (ISSN: 9780-4445), 2006; N/D: 254-257.
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De Luca S, Sanseverino M, Zocchi I, Pedone C, Morelli G, Ragone R
* Receptor fragment approach to the binding between CCK8 peptide and cholecystokinin receptors: A fluorescence study on type B receptor fragment CCKB-R (352-379) (98 visite)
Biopolymers (ISSN: 0006-3525, 0006-6352, 0006-3525print), 2005 Mar; 77(4): 205-211.
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Improta R, Barone V
* Absorption and fluorescence spectra of uracil in the gas phase and in aqueous solution: A TD-DFT quantum mechanical study (179 visite)
J Am Chem Soc (ISSN: 0002-7863, 0002-2786, 1520-5126), 2004 Nov 10; 126(44): 14320-14321.
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De Luca S, Ragone R, Bracco C, Digilio G, Tesauro D, Saviano M, Pedone C, Morelli G
* The role of segment 32-47 of cholecystokinin receptor type A in CCK8 binding: Synthesis, nuclear magnetic resonance, circular dichroism and fluorescence studies (100 visite)
J Pept Sci (ISSN: 1075-2617, 1099-1387, 1075-2617print), 2003 Mar; 9(3): 156-169.
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Ragone R, De Luca S, Tesauro D, Pedone C, Morelli G
Fluorescence studies on the binding between 1-47 fragment of cholecystokinin receptor CCKA-R(1-47) and nonsulfated cholecystokinin octapeptide CCK8 (115 visite)
Biopolymers (ISSN: 0006-3525, 0006-6352, 0006-3525print), 2000; 56(1): 47-53.
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Colasanti A, Kisslinger A, Fabbrocini G, Liuzzi R, Quarto M, Riccio P, Roberti G, Villani F
MS-2 fibrosarcoma characterization by laser induced autofluorescence (88 visite)
Lasers Surg Med (ISSN: 0196-8092print, 0196-8092linking), 2000; 26(5): 441-448.
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Gurrieri S, Rizzarelli E, Beach D, Bustamante C
Imaging of kinked configurations of DNA molecules undergoing orthogonal field alternating gel electrophoresis by fluorescence microscopy (70 visite)
Biochemistry (ISSN: 0006-2960, 1520-4995, 1520-4995electronic), 1990 Apr 3; 29(13): 3396-3401.
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21 Records (18 escludendo Abstract e Conferenze).
Impact factor totale: 78.7 (71.514 escludendo Abstract e Conferenze).
Impact factor a 5 anni totale: 82.707 (75.348 escludendo Abstract e Conferenze).







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