Structure-Property Evaluation of Knoevenagel-derived π-Conjugated Organic Systems

Abstract

π-Conjugated organic compounds display unique optical and electrical properties, rendering them appropriate for semiconducting applications. Knoevenagel condensation is one of the important reactions that facilitate the formation of olefin linkages (-C=C-) and thus has been widely employed to synthesize new π-conjugated molecules. This review summarizes the synthesis of π-conjugated compounds constructed using four novel π-conjugated moieties: diketonate/azopyrrole-BF2 complexes (BF), p-azaquinodimethane (AQM), diketopyrrolopyrrole (DPP), and barbituric acid (BA), alongside their optoelectronic features and applications in sensing, bioimaging, and photovoltaic technologies.