Electronic spectra and photophysics of δ-carboline (5H-pyrido[3,2-b]indole)

Add time:07/14/2019    Source:sciencedirect.com

The absorption, excitation, fluorescence and phosphorescence spectra of δ-carboline, 5H-pyrido[3,2-b]indole, have been investigated in non-aqueous solvents of various polarity at room temperature and 77 K. The δ-carboline fluorescence shows time-resolved red shifts, solvatochromic effects, non-exponential decays and anomalous temperature dependence. These results suggest that the fluorescence emission of δ-carboline originates from two close low lying excited states which do not equilibrate on the time scale of fluorescence emission: a non-polar locally excited state (LE) and a polar intramolecular charge transfer state (CT). The contributions of the LE and CT states to the total fluorescence spectrum of δ-carboline progressively change as the solvent polarity increases. The possibility of a vibronically induced coupling of these excited states could also reasonably explain the reduction of the fluorescence quantum yield and the increase of the phosphorescence quantum yield of δ-carboline as compared with carbazole.

We also recommend Trading Suppliers and Manufacturers of 5H-Indole (cas 4940-66-3). Pls Click Website Link as below: cas 4940-66-3 suppliers

Prev:Rhodium-catalyzed reactions of 3-diazoindolin-2-imines with enamines and their extensions towards 5H-pyrazino[2,3-b]indoles
Next:Synthesis and biological evaluation of new 5-benzylated 4-oxo-3,4-dihydro-5H-pyridazino[4,5-b]indoles as PI3Kα inhibitors)