Effects of Solute-Solvent Interactions on Radiationless Decay of Thioketones Excited to Their S_{2}- and T_{1}-States

• Authors: M. Szymański , M. Balicki , M. Binkowski , J. Kubicki , A. Maciejewski , E. Pawłowska , T. Wróżowa
• Languages of publication: EN

Abstracts

EN

Spectral and photophysical properties of a few aromatic thioketones in their S_{2}- and T_{1}-states, in particular those determined by their interactions with solvents, are discussed. The reasons for a drastically different behaviour of thioketones in interactions with benzene as well as saturated hydrocarbons and perfluoroalkanes are analysed in more detail. Results of the time-resolved transient absorption measurements in the pico- and nanosecond time scale are given. An analysis of these results proves that a product of the decay of the S_{2}-state of xanthione in benzene is a new transient (τ_{1/e} ≥ 60 ps) individuum which, regarding the system properties and the conditions of the experiment, has been identified as an exciplex in S_{2}-state formed as a result of an efficient interaction with benzene molecule. Also in xanthione//alkane systems the involvement of a transient individuum was proved. Most probably, this individuum was a thioketyl radical which could be formed by hydrogen abstraction from a hydrocarbon molecule by xanthione in the S_{2}-state. Such individua act as intermediates in passing excitation to the triplet states of thioketones and are effective channels of the S_{2}-state decay. The changes observed in the transient absorption spectra of xanthione in C_{6}H_{6} in the time range of 10^{-7}-10^{-6} s can be attributed to the formation of an excimer in the T_{1}-state as a result of the T_{1}-state selfquenching.

Keywords

EN

33.50.Dq; 33.50.Hv; 35.80.Be

Discipline

• 33.50.Hv: Radiationless transitions, quenching
• 33.50.Dq: Fluorescence and phosphorescence spectra

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1996
• Volume: 89
• Issue: 4
• Pages: 527-546

Dates

published

1996-04

received

1995-08-21

(unknown)

1996-01-24

Contributors

author

M. Szymański

• Institute of Physics, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland

author

M. Balicki

• Institute of Physics, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland

author

M. Binkowski

• Institute of Physics, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland

author

J. Kubicki

• Institute of Physics, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland

author

A. Maciejewski

• Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland

author

E. Pawłowska

• Institute of Physics, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland

author

T. Wróżowa

• Institute of Physics, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland

Identifiers

DOI

10.12693/APhysPolA.89.527