Molecular packing and aggregation-induced emission of 4-dicyanomethylene-2,6-distyryl-4H-pyran derivatives

From aggregation-induced quenching to aggregation-induced emission, completely different fluorescence properties of two 4-dicyanomethylene-2,6-distyryl-4H-pyran derivatives were examined in different solution and solid states to elucidate the effects of molecular structure and packing on their emission properties.