Abstract
On the basis of molecular design about the donor-acceptor (D-A) triphenylamine-coumarin (TPA-coumarin) dyad, two new bichromophores 7-butoxy-6-(4-(diphenylamino)phenyl)-4,8-dimethyl-2H-chromen-2-one (TC) and 7-butoxy-6-(4-(diphenylamino)phenyl)-8-methyl-4-(trifluoromethyl)-2H-chromen-2-one (TF), were synthesized and characterized by using IR, 1H NMR, 13C NMR and HRMS. Both TC and TF exhibited the expected solid-state fluorescence emission due to the aggregation induced emission effect and different degrees of positive solvatochromism due to their different molecular conformations in various solvents. Owing to the different push-pull electronic effects of substituents on the coumarin moiety, TC and TF, acting as the D-A compounds, showed different HOMO-LUMO gaps and a variable red-shifted emission in their solid-state, substantiating the possibility to effectively tune the photophysical properties of these bichromophores by rational molecular design.
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