Heteroaryi-substituted C3-bridged oligopyrroles:: Potential building subunits of anion-responsive π-conjugated oligomers

Acyclic anion receptors (BF2 complexes of dipyrrolyidiketones) with heteroaryl moieties synthesized by using cross-coupling reactions have unique electronic states, as observed in UV/vis absorption spectra. Among heteroaryl-substituted derivatives, a pyrrolyl-substituted receptor exhibits an extremely high affinity for anions in solution.