TY - JOUR
T1 - Oxazole Dyes with Potential for Photoluminescence Bioprobes
T2 - A Two-Photon Absorption Study
AU - Abegão, Luis M.G.
AU - Fonseca, Ruben D.
AU - Ramos, Tárcius N.
AU - Mahuteau-Betzer, Florence
AU - Piguel, Sandrine
AU - Joatan, José R.
AU - Mendonça, Cleber R.
AU - Canuto, Sylvio
AU - Silva, Daniel L.
AU - De Boni, Leonardo
N1 - Funding Information:
The authors acknowledge the financial support from FAPESP (Fundaca̧ õ de Amparo à Pesquisa do Estado de Saõ Paulo 2011/ 12399-0, 2015/20032-0, 2015/14189-3 and 2016/20886-1) and CNPq (Conselho Nacional de Desenvolvimento Cientifí co e Tecnologico).́
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/5/17
Y1 - 2018/5/17
N2 - In this work, six π-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.
AB - In this work, six π-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.
UR - http://www.scopus.com/inward/record.url?scp=85047495662&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.8b01904
DO - 10.1021/acs.jpcc.8b01904
M3 - Article
AN - SCOPUS:85047495662
SN - 1932-7447
VL - 122
SP - 10526
EP - 10534
JO - Journal of Physical Chemistry C: Nanomaterials and interfaces
JF - Journal of Physical Chemistry C: Nanomaterials and interfaces
IS - 19
ER -