Nonlinear spectroscopy and transient absorption in chalcones and purines derivatives
Abstract
We propose to study second- and third-order optical nonlinearities of two promising classes of pi-conjugated molecular system; chalcones and purines, which are potential candidates as nonlinear optical materials. Chalcones are naturally found in plants, but can also be synthesized, with several biological applications as antibacterial and anticancer. Recently, however, they have been shown to present high nonlinear optical properties. They constitute an interesting choice as nonlinear materials given the possibility of obtaining a wide range of compounds bearing the same molecular backbone. Purines present a primary structure that presents an organic backbone that includes the nucleobases of nucleic acids, which links together a pyrimidine ring and an imidazole ring. Therefore, they are relevant for the improvement of DNA spectroscopy. The nonlinear optical properties, specifically multi-photon absorption and Hyper-Rayleigh scattering will be investigated. Also, transient absorption measurements of the samples, to determine the time response and nature of the observed optical properties, will be performed. The results will be analyzed with the aid of quantum chemical calculations provided by response function formalism with the density functional theory framework. With such approach it will be possible to correlate the optical response with the molecular structure.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Oct 07, 2021
- Source ID
- W911NF2110362
Entities
People
- Cleber R Mendonca
Organizations
- Army Contracting Command
- São Carlos Institute of Physics at the University of São Paulo
- United States Army