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 500nm 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.
Journal of Luminescence – Elsevier
Published: May 1, 2018
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