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Abstract
Spectral and kinetic characteristics of annihilation-delayed fluorescence (ADF) of 7-azaindole in cyclohexane solution were measured at room temperature. Two bands with maxima at 345 and 480 nm were observed in the ADF spectrum. The short-wavelength band was interpreted as ADF of dimers formed by dipole–dipole interactions of molecules in excited singlet and ground states that were populated by triplet–triplet annihilation (TTA) of monomers. The long-wavelength band was attributed to ADF of dimer-tautomers formed by a double H-bond and double proton transfer. Excited singlet states of dimer-tautomers were populated by mixed annihilation of monomer and dimer-tautomer triplet states. Decay kinetics of monomer and dimer-tautomer triplet states were determined mainly by TTA processes.
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