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Othmani H, Ben Said R, Terzi N, Jaidane NE, Mogren Al Mogren M, Elmarghany A, Hochlaf M. Structural, energetic and spectroscopic characterisation of 5-fluorouracil anticarcinogenic drug isomers, tautomers and ions. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1548715] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- H. Othmani
- Laboratoire de Modélisation et Simulation Multi Echelle, Université Paris-Est, MSME UMR 8208 CNRS, Champs-sur-Marne, France
- Faculté des Sciences de Tunis, Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA, Université de Tunis El-Manar, Tunis, Tunisia
| | - R. Ben Said
- Department of Chemistry, College of Science & Arts at Al-Rass, Qassim University, Al-Rass, Kingdom of Saudi Arabia
- Unité de recherche Physico-Chimie des Matériaux à l’Etat Condensé, Département de Chimie, Faculté des Sciences de Tunis, Université Tunis El Manar, Tunis, Tunisia
| | - N. Terzi
- Faculté des Sciences de Tunis, Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA, Université de Tunis El-Manar, Tunis, Tunisia
| | - N.-E. Jaidane
- Faculté des Sciences de Tunis, Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA, Université de Tunis El-Manar, Tunis, Tunisia
| | - M. Mogren Al Mogren
- Chemistry Department, Faculty of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - A. Elmarghany
- Chemistry Department, Faculty of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia
- Faculty of Science, Suez University, Suez, Egypt
| | - M. Hochlaf
- Laboratoire de Modélisation et Simulation Multi Echelle, Université Paris-Est, MSME UMR 8208 CNRS, Champs-sur-Marne, France
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Raviola C, Chiesa F, Protti S, Albini A, Fagnoni M. On the Route to the Photogeneration of Heteroaryl Cations. The Case of Halothiophenes. J Org Chem 2016; 81:6336-42. [PMID: 27383725 DOI: 10.1021/acs.joc.6b00978] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
2-Chloro-, 2-bromo-, and 2-iodothiophenes undergo photochemical dehalogenation via the triplet state. In the presence of suitable π-bond nucleophiles, thienylation occurs with modest yield from chloro and bromo derivatives (via photogenerated triplet 2-thienyl cation). Specific trapping by using oxygen along with computational analysis carried out by means of a density functional method support that, in the case of iodo derivatives, homolytic thienyl-I bond fragmentation occurs first and heteroaryl cations are formed by electron transfer within the triplet radical pair, thus opening an indirect access to such cations.
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Affiliation(s)
- Carlotta Raviola
- PhotoGreen Lab, Department of Chemistry, University of Pavia , Viale Taramelli 12, 27100 Pavia, Italy
| | - Francesco Chiesa
- Department of Chemistry, University of Pavia , Viale Taramelli 12, 27100 Pavia, Italy
| | - Stefano Protti
- PhotoGreen Lab, Department of Chemistry, University of Pavia , Viale Taramelli 12, 27100 Pavia, Italy
| | - Angelo Albini
- PhotoGreen Lab, Department of Chemistry, University of Pavia , Viale Taramelli 12, 27100 Pavia, Italy
| | - Maurizio Fagnoni
- PhotoGreen Lab, Department of Chemistry, University of Pavia , Viale Taramelli 12, 27100 Pavia, Italy
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Paulina Montaña M, Blasich N, Haggi E, García NA. Oxygen Uptake in the Vitamin B2-sensitized Photo-oxidation of Tyrosine and Tryptophan in the Presence of Uracil: Kinetics and Mechanism. Photochem Photobiol 2009; 85:1097-102. [DOI: 10.1111/j.1751-1097.2009.00567.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ciesielska B, Łukaszewicz A, Celewicz L, Maciejewski A, Kubicki J. Method of determination of emission properties of very weakly emitting species ensuring elimination of emission of impurities. APPLIED SPECTROSCOPY 2007; 61:102-9. [PMID: 17311723 DOI: 10.1366/000370207779701389] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
This paper describes a new type of spectrofluorimeter, composed of a high-performance liquid chromatography (HPLC) system directly connected to a fluorescence detector and an absorption photodiode array detector, designed for studying the emission of weakly emitting species. Procedures for measurements of emission spectra (ES), emission excitation spectra (EES), and quantum yields of emission (PhiE) for very weakly emitting systems (PhiE>or=10(-7)) have been proposed. The original methodical solution allows verification of whether the emission observed comes solely from the compound studied (and not from its impurities) or from some photochemical or thermal process taking place during measurements. Thanks to the use of this new type of spectrofluorimeter, it is possible to establish with a high probability that the dependence of the shape and position of the ES on the excitation wavelength and the differences between EES and absorptance spectra are due to photophysical and/or photochemical properties of the compound studied and not due to the presence of emitting impurities. An especially interesting application of this method is to study the emission of species whose very weak emission is related to a very short lifetime as well as a low radiative rate constant. It is particularly suitable to the study of the emission properties of flexible molecules that can occur in a few conformers of different absorption and emission properties. The performance of the method is illustrated by the results of the emission studies carried out for Nalpha-acetyl-2-(uracil-5-yl)-L-tryptophan N-ethylamide.
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Affiliation(s)
- Barbara Ciesielska
- Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland
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5
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Sanderson JM, Whelan EJ. Characterisation of the interactions of aromatic amino acids with diacetyl phosphatidylcholine. Phys Chem Chem Phys 2004. [DOI: 10.1039/b312184d] [Citation(s) in RCA: 43] [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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Shukla M, Kumar A, Mishra P. An ab initio study of excited state molecular electrostatic potential maps and other related properties of 5-fluorouracil: a comparative study with uracil. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s0166-1280(00)00584-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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