Electronic spectra and fluorescence of dithiinodiquinoline compounds. An experimental and theoretical study
| Autor: | Maria Jaworska, Wojciech A. Pisarski, Lidia Żur, Piotr Lodowski, Maria J. Maślankiewicz |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Cyclohexane 010405 organic chemistry Biophysics General Chemistry Time-dependent density functional theory 010402 general chemistry Condensed Matter Physics 01 natural sciences Biochemistry Molecular physics Atomic and Molecular Physics and Optics Spectral line 0104 chemical sciences chemistry.chemical_compound chemistry Excited state Emission spectrum Ground state Luminescence Absorption (electromagnetic radiation) |
| Zdroj: | Journal of Luminescence. 197:7-17 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2017.12.059 |
| Popis: | Absorption and emission properties of six dithiinodiquinolines 1–6 (composed of 2,3- and/or 3,4-quinolinediyl units fused with 1,4-dithiin moiety) in methanol and cyclohexane solutions were studied. Differences in fluorescence properties of the compounds 1–6 are observed, depending on the type of condensed pattern of quinoline units. Emision bands of 1 and 2 occur at wavelengths over 500 nm are shifted systematically towards shorter waves when coming from 1,2 to 3,4 and 5,6. The compounds 1–6 posses long fluorescence lifetimes of several microseconds, which can be explained by an effective electronic conjugation in the excited state. In particular, the emission spectra of 3–6 in cyclohexane show two peaks characteristic for dual luminescence. The absorption and emission properties of compounds 1–6 were discussed in terms of DFT and TDDFT calculations. The geometry optimization of the excited nstates results in a planar structure as compared to a folded structure in the ground state of ditthiinodiquinolines 1–6. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect