Journal
CHEMICAL SCIENCE
Volume 11, Issue 29, Pages 7599-7608Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0sc02459g
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Funding
- Regione Lombardia project I-Zeb
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The development of purely organic materials showing multicolor fluorescent and phosphorescent behaviour represents a formidable challenge in view of practical applications. Herein the rich photophysical behaviour of 3-(pyridin-2-yl)triimidazotriazine (TT-Py) organic molecule, comprising excitation-dependent fluorescence and phosphorescence under ambient conditions in both blended films and the crystalline phase, is investigated by means of steady state, time resolved and ultrafast spectroscopies and interpreted on the basis of X-ray diffraction studies and DFT/TDDFT calculations. In particular, by proper excitation wavelength, dual fluorescence and dual phosphorescence of molecular origin can be observed together with low energy phosphorescences resulting from aggregate species. It is demonstrated that the multiple emission properties originate from the copresence, in the investigated system, of an extended polycyclic nitrogen-rich moiety (TT), strongly rigidified by pi-pi stacking interactions and short C-HMIDLINE HORIZONTAL ELLIPSISN hydrogen bonds, and a fragment (Py) having partial conformational freedom.
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