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Excited state dynamics of donor ­acceptor systems investigated by time resolved spectroscopic techniques

Grant number: 15/24818-8
Support type:Scholarships abroad - Research
Effective date (Start): August 01, 2016
Effective date (End): July 31, 2017
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal researcher:Rômulo Augusto Ando
Grantee:Rômulo Augusto Ando
Host: Terry Lee Gustafson
Home Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Research place: Ohio State University, Columbus, United States  
Associated research grant:12/13119-3 - Vibrational spectroscopy in condensed phases, AP.TEM


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)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ANDO, ROMULO A.; BROWN-XU, SAMANTHA E.; NGUYEN, LISA N. Q.; GUSTAFSON, TERRY L.. Probing the solvation structure and dynamics in ionic liquids by time-resolved infrared spectroscopy of 4-(dimethylamino) benzonitrile. Physical Chemistry Chemical Physics, v. 19, n. 36, p. 25151-25157, . (15/24818-8)

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