{Reference Type}: Journal Article
{Title}: 3-Ethynyltriimidazo[1,2-a:1',2'-c:1″,2″-e][1,3,5]triazine Dual Short- and Long-Lived Emissions with Crystallization-Enhanced Feature: Role of Hydrogen Bonds and π-π Interactions.
{Author}: Malpicci D;Maver D;Rosadoni E;Colombo A;Lucenti E;Marinotto D;Botta C;Bellina F;Cariati E;Forni A;
{Journal}: Molecules
{Volume}: 29
{Issue}: 9
{Year}: 2024 Apr 25
{Factor}: 4.927
{DOI}: 10.3390/molecules29091967
{Abstract}: Organic room temperature phosphorescent (ORTP) materials with stimuli-responsive, multicomponent emissive behaviour are extremely desirable for various applications. The derivative of cyclic triimidazole (TT) functionalized with an ethynyl group, TT-CCH, is isolated and investigated. The compound possesses crystallization-enhanced emission (CEE) comprising dual fluorescence and dual phosphorescence of both molecular and supramolecular origin with aggregation-induced components highly sensitive to grinding. The mechanisms involved in the emissions have been disclosed thanks to combined structural, spectroscopic and computational investigations. In particular, strong CH⋯N hydrogen bonds are deemed responsible, for the first time in the TT family, together with frequently observed π⋯π stacking interactions, for the aggregated fluorescence and phosphorescence.