Spectral and Luminescent Properties of Octahydroacridino[4,3-c]acridine-1,9(2H, 5H)dione Derivatives
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Octahydroacridino[4,3-c]acridine-1,9(2H,5H)dione derivatives were synthesized via condensation of bisazomethines (N1,N5-di-R-benzylidenenaphthalene-1,5-diamines) with dimedone in butanol-1. The structures of the prepared compounds were confirmed using NMR and IR spectroscopy. Studies of the spectral and luminescent properties of the synthesized compounds in EtOH and DMF at 293 and 77 K showed that the absorption spectra were composed of three electronic transitions Sn ← S0 (n = 1–3) with frequencies of 24,400 and 20,800 cm–1 for the 0–0-transitions from the singlet (S1) and triplet (T1) states, respectively. Fluorescence quenching by EtOH was due to the formation of an H-bonded complex, the lifetime of which was <10–9 s. The naphthalene fragment in the molecule was responsible for phosphorescence in the studied compounds.
Keywords
fluorescence phosphorescence diamines octahydroacridino[4,3-c]acridine-1,9(2H,5H)dionesPreview
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