An nπ* gated decay mediates excited-state lifetimes of isolated azaindoles

Abstract

Aiming to serve as guide to understand the relaxation mechanisms of more complex aza-aromatic compounds, such as purine bases, we have studied the non-radiative channels of a set of azaindole...

Photodynamics of azaindoles in polar media: the influence of the environment

“…Therefore, we can conclude from the steady-state data that the np* surface, which is mainly affected by the solvent polarity, plays an important role in controlling the fluorescence of the isomers, in correlation with the relaxation mechanism found in the gas phase. 5 The FuC measurements (Fig. 2 and 3) confirm and provide further details on the effect of the solvent on the operative mechanism.…”

“…It is important to remark that due to solubility/aggregation issues it was not possible to obtain time-resolved data of the AIs monomers in non-polar medium. Then, the picture obtained for the isolated molecules 5 is the starting point to interpret the relaxation dynamics observed in the different solvents. As it was sketched in the introduction, the three excited states whose vertical VEEs are summarized in Table 1, are involved in the photodynamics of the AI isomers.…”

Pre-Dewar structure modulates protonated azaindole photodynamics

“…1 for the atom numbering) are excellent blue emitters for organic lightemitting diodes (OLEDs). 4 Although one can find a handful of articles on 7-azaindole as an isolated monomer, [5][6][7][8] in dimeric forms 5,[9][10][11][12][13] and in water and alcohol clusters, 11,[14][15][16][17][18][19][20] only one recent article 21 to date shed light upon the photophysical relaxation mechanism of nazaindole molecules by studying gas-phase excited-state dynamics. Experiments and theoretical calculations have also been devoted 16,18,[22][23][24] to understanding the excited-state proton transfer and tautomerization mechanism of 7-azaindole with solvent molecules.…”

Weak Dewar bond modulates protonated azaindole photodynamics

“…Experimental spectral width and derived lifetimes of n-AIH + isomers from Ref. 25 Although one can find a handful of articles on 7-azaindole in isolated monomer, [5][6][7][8] in dimeric forms 5,[9][10][11][12][13] and water and alcohol clusters, 11,[14][15][16][17][18][19][20] only one recent article 21 to date shed light upon the photophysical relaxation mechanism of n-azaindole molecules by studying gasphase excited-state dynamics. Experiments and theoretical calculations have also been devoted 16,18,[22][23][24] to understanding the excited-state proton transfer and tautomerization mechanism of 7-azaindole with solvent molecules.…”