| Grant number: | 15/24818-8 |
| Support Opportunities: | Scholarships abroad - Research |
| Start date: | August 01, 2016 |
| End date: | July 31, 2017 |
| Field of knowledge: | Physical Sciences and Mathematics - Chemistry - Physical-Chemistry |
| Principal Investigator: | Rômulo Augusto Ando |
| Grantee: | Rômulo Augusto Ando |
| Host Investigator: | Terry Lee Gustafson |
| Host Institution: | Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil |
| Institution abroad: | Ohio State University, Columbus, United States |
| Associated research grant: | 12/13119-3 - Vibrational spectroscopy in condensed phases, AP.TEM |
Abstract The description of photoinduced intramolecular charge transfer is fundamental for the understanding of important reactions that occur in different contexts of chemistry. It is known that the excited state dynamics of chemical species in solution depends essentially on the solvent relaxation time and the intramolecular structural reorganization that accompanies the electronic excitation. In order to understand both, the solvent effects and molecular changes that take place after the excitation, the use of molecular probes with donor-acceptor properties is convenient due to the presence of characteristic charge transfer excited state, that gives rise to distinct vibrational features in comparison to the ground electronic state. The focus of this project is the investigation of several conjugated donor-acceptor systems in molecular and ionic solvents by time resolved spectroscopic techniques. In particular, cyano and nitro aromatic substituted compounds will be dissolved in conventional organic solvents of different polarities and in different classes of ionic liquids, and transient absorption (TA), time resolved infrared (TRIR) and Raman (TRR) spectroscopies will be used to describe the fate of the excited states. Also, density functional theory (DFT/TDDFT) calculations will be performed to support the experimental data. Our approach intends to provide a deeper understanding of solvation processes that determine the physico-chemical properties of an important class of molecules. (AU) | |
| News published in Agência FAPESP Newsletter about the scholarship: | |
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