Time-Resolved Fluorescence and Solvatochromy of Directly Linked Pyrene−DMA Derivatives in Alcoholic Solution
Year: 2001
Type: article
Abstract: Picosecond transient absorption spectroscopy and picosecond spectro-streak fluorescence measurements have been carried out in order to understand the complex photophysical dynamics of directly linked donor−acceptor systems and the solvation dynamics in longer-chain alcohols. With these techniques, the fast solvent response to optically generated charge transfer (CT) species can be followed. Studies were performed on covalently linked donor−acceptor systems of the type pyrene with derivatives of N, N -dimethylaniline: dimethyl-(4-pyren-1-yl-phenyl)-amine, dimethyl-(3-methyl-4-pyren-1-yl-phenyl)-amine and (3,5-dimethyl-4-pyren-1-yl-phenyl)-dimethylamine. The results are interpreted with particular emphasis on solvation dependent electronic restructuring of the CT species. We suggest a mechanism where the adiabatic electronic restructuring coincides with the coupling to the torsional degrees of freedom of the solvent.
DOI: 10.1021/jp004370l
Language: English
Subfield: Physical and Theoretical Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: green
Funder: Deutsche Forschungsgemeinschaft
OpenAlex ID: W2019752826