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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Lepetit, Christine Maraval, Valérie Maldonado, José-luis Chauvin, Remi Barba-barba, Rodrigo M. Poidevin, Corentin Saffon-merceron, Nathalie Baglai, Iaroslav De Anda-villa, Manuel Ramos-ortíz, Gabriel |
| Description | Author Affiliation: Baglai I ( CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099, 31077 Toulouse CEDEX 4 (France).); de Anda-Villa M ( Université de Toulouse, UPS, ICT-FR 2599, 31062 Toulouse CEDEX 9 (France).); Barba-Barba RM ( Kiev National Taras Shevchenko University, 60 Volodymyrska Str., 01033 Kiev (Ukraine).); Poidevin C ( Centro de Investigaciones en Óptica A.P. 1-948, 37000 León, Gto. (México), Fax: (+33) 5-61-55-30-03.); Ramos-Ortíz G ( Centro de Investigaciones en Óptica A.P. 1-948, 37000 León, Gto. (México), Fax: (+33) 5-61-55-30-03.); Maraval V ( CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099, 31077 Toulouse CEDEX 4 (France).); Lepetit C ( Université de Toulouse, UPS, ICT-FR 2599, 31062 Toulouse CEDEX 9 (France).); Saffon-Merceron N ( Centro de Investigaciones en Óptica A.P. 1-948, 37000 León, Gto. (México), Fax: (+33) 5-61-55-30-03. garamoso@cio.mx.); Maldonado JL ( CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099, 31077 Toulouse CEDEX 4 (France). chauvin@lcc-toulouse.fr.); Chauvin R ( Université de Toulouse, UPS, ICT-FR 2599, 31062 Toulouse CEDEX 9 (France). chauvin@lcc-toulouse.fr.) |
| Abstract | The synthesis, crystal and electronic structures, and one- and two-photon absorption properties of two quadrupolar fluorenyl-substituted tetraphenyl carbo-benzenes are described. These all-hydrocarbon chromophores, differing in the nature of the linkers between the fluorenyl substituents and the carbo-benzene core (CC bonds for 3 a, CCCC expanders for 3 b), exhibit quasi–superimposable one-photon absorption (1PA) spectra but different two-photon absorption (2PA) cross-sections $σ_{2PA}.$ Z-scan measurements (under NIR femtosecond excitation) indeed showed that the CC expansion results in an approximately twofold increase in the $σ_{2PA}$ value, from 336 to 656 GM $(1 GM=10^{−50} cm^{4} s molecule^{−1} photon^{−1})$ at λ=800 nm. The first excited states of $A_{u}$ and $A_{g}$ symmetry accounting for 1PA and 2PA, respectively, were calculated at the TDDFT level of theory and used for sum-over-state estimations of $σ_{2PA}(λ_{i}),$ in which $λ_{i}=2 hc/E_{i},$ h is Planck’s constant, c is the speed of light, and $E_{i}$ is the energy of the 2PA-allowed transition. The calculated $σ_{2PA}$ values of 227 GM at 687 nm for 3 a and 349 GM at 708 nm for 3 b are in agreement with the Z-scan results. |
| ISSN | 09476539 |
| e-ISSN | 15213765 |
| Journal | Chemistry - A European Journal |
| Issue Number | 40 |
| Volume Number | 21 |
| Language | English |
| Publisher | Wiley-VCH;ChemPubSoc Europe |
| Publisher Date | 2015-09-28 |
| Publisher Place | Germany |
| Access Restriction | Open |
| Subject Keyword | Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Catalysis |
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