High CT-Fluorophore Featuring a Basic Moiety into D-A Chain as a p Probe.

The determination of acidity represents a significant challenge within fluorometry, and no effective strategy has been developed successfully yet. It is attributed to the fact that acidity tends to be enhanced upon excitation, giving, in general, an overestimation of the ionization constant, p. Herein, we developed a strategy for p estimation of Brønsted acids in solution through fluorometry by using a convenient p probe, -aryl-7-methoxy-2-(trifluoromethyl)benzo[][1,8]naphthyridin-4(1)-one.

Photo-Induced Partially Aromatized Intramolecular Charge Transfer.

Diverse models of intramolecular charge transfer (ICT) have been proposed for interpreting the origin of the charge-transfer (CT) state in donor-acceptor (D-A) dyes. However, a large variety of fused-heterocyclic dyes containing a pseudo-aromatic ring in the rigid structure have shown to be incompatible with them. To approximate a solution within the ICT concept, we reported a novel ICT model called partially aromatized intramolecular charge transfer (PAICT).