Synthesis and properties of 1,1′‐methylene‐2,2′‐dipyrrolyl ketone

Abstract

Abstract 1,1′‐methylene‐2,2′‐dipyrrolyl ketone can be conveniently prepared in high yield, starting from pyrrole, in three steps. It shows extreme properties that are not observed in comparable rigid ketone systems. These chemical and physical properties can be explained assuming mesomeric forms with charge separation resulting from the electron rich pyrrole rings and the rigidity of the system. The fluorescence quantum yield is 0.07 and the fluorescence lifetime is 27 ns.