Diversified AIE and mechanochromic luminescence based on carbazole derivatives decorated dicyanovinyl groups: Effects of Substitution Site and Molecular Packing
Aggregation-induced emission (AIE) properties have been widely investigated not only because they thoroughly circumvent the notorious aggregation-caused quenching effect confronted in conventional fluorophores but also their promising applications in organic light-emitting diodes, fluorescent sensors and bioimaging. In this work, we reported a study of the molecular packing and luminescence properties of AIE active positional isomers (m-BPCDM and p-BPCDM) with carbazole and dicyanovinyl groups. The compound of m-BPCDM based on the meta-substitution showed more evident AIE processes than the compound of p-BPCDM based on the para-substitution, which can be attributed to the strong π-π stacking effect brought by the plane spatial structure of p-BPCDM. Moreover, the two positional isomers also exhibited distinct mechanochromic luminescence properties.