Palestrante
Descrição
Chalcones are a molecular group with potential biological, pharmaceutical and optical applications. (1) These molecules are easy synthetized in laboratories, allowing molecular engineering in order to achieve the high nonlinearities desired for laser harmonic generation and optical limiters. In this work we studied the Hyper Rayleigh Scattering (HRS), a process related with the second order nonlinear property of four chalcones molecules with the same structural molecular framework, but with the substituent nitro (NO2) at distinct positions, as well as the unsaturation in the cyclohexene. The samples were dissolved in dimethyl sulfoxide (DMSO) and characterized. Linear absorption was determined using a UV-Vis spectrophotometer (Shimadzu UV-1800). HRS was performed using 100 ps pulses from a Nd:YAG laser at 1064 nm. The laser is focused at the sample and the scattered light at 532 nm is acquired by a photomultiplier. The results showed values for the HRS between 14.7 and 43.3 10-30 cm^5/esu for the first hyperpolarizability, showing that substituent and unsaturation position play a significant role on the charge distribution which directly impacts the nonlinearities. These results are interesting and can be used for molecular design strategies, indicating the best substituent position for increasing the nonlinearities, which is desirable for optical and photonics applications.
Referências
1 LEMES, S. R. et al. Optical properties and antiangiogenic activity of a chalcone derivate. Spectrochimica Acta Part A: molecular and biomolecular spectroscopy, v. 204, p. 685-695, Nov. 2018. doi: 10.1016/j.saa.2018.06.099.
| Apresentação do trabalho acadêmico para o público geral | Não |
|---|---|
| Subárea | Óptica e Lasers |
