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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Oxazole Dyes with Potential for Photoluminescence Bioprobes: A Two-Photon Absorption Study

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Abegao, Luis M. G. [1] ; Fonseca, Ruben D. [2, 3] ; Ramos, Tarcius N. [4] ; Mahuteau-Betzer, Florence [5] ; Piguel, Sandrine [5, 6] ; Jose Joatan, Jr., R. [1] ; Mendonca, Cleber R. [2] ; Canuto, Sylvio [4] ; Silva, Daniel L. [7] ; De Boni, Leonardo [2]
Total Authors: 10
[1] Univ Fed Sergipe, Dept Fis, BR-49100000 Sao Cristovao, Sergipe - Brazil
[2] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil
[3] Univ Costa, Dept Ciencias Nat & Exactas, Barranquilla 080002 - Colombia
[4] Univ Sao Paulo, Inst Fis, Rua Matao 1371, BR-05508090 Sao Paulo, SP - Brazil
[5] PSL Res Univ, Inst Curie, CNRS, INSERM, UMR9187, U1196, F-91405 Orsay - France
[6] Univ Paris Saclay, Univ Paris Sud, F-91405 Orsay - France
[7] Univ Fed Sao Carlos, Dept Ciencias Nat Matemat & Educ, Rod Anhanguera Km 174, BR-13600970 Araras, SP - Brazil
Total Affiliations: 7
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 122, n. 19, p. 10526-10534, MAY 17 2018.
Web of Science Citations: 4

In this work, six pi-conjugated oxazole compounds dissolved in dichloromethane were characterized with linear and nonlinear optical measurements. Z-scan with femtosecond laser pulses was employed to determine the two-photon absorption (TPA) spectra. Other photophysical parameters, such as absorbance, solvatochromism, lifetime fluorescence, and fluorescence anisotropy, were evaluated with linear optical techniques. The experimental TPA cross section spectra were adjusted by the sum-over-states (SOS) model, by which important parameters such as transition dipole moments and broadening parameters were determined. To better understand the TPA spectra of the oxazole compounds, quantum-chemical calculations using the response function formalism and the density functional theory level of theory were performed. Using the results provided by the quantum-chemical calculations and the broadening parameters estimated through the application of the SOS model, the TPA spectra were simulated by the superposition (summation) of individual homogeneous Lorentzian absorption profiles. (AU)

FAPESP's process: 11/12399-0 - Femtosecond pulses applied to nonlinear optics: spectroscopy, pulse shaping and microfabrication
Grantee:Cleber Renato Mendonça
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/20032-0 - Study on Nonlinear and Charge Transport Properties of Multi-branched Molecules via Quantum Chemical Methods.
Grantee:Daniel Luiz da Silva
Support type: Regular Research Grants
FAPESP's process: 16/20886-1 - Ultrafast nonlinear optical spectroscopy: Transient Absorption and optical Kerr Gate with polarization control
Grantee:Leonardo De Boni
Support type: Regular Research Grants
FAPESP's process: 15/14189-3 - Two-Photon Absorption Spectroscopy in Organic Molecules Including Solvent Effects
Grantee:Tárcius Nascimento Ramos
Support type: Scholarships in Brazil - Doctorate