Self-complementary hydrogen-bonded duplexes and helices based on bis(pyrrolyl)carbohydrazide derivatives

A series of novel bis(pyrrolyl)carbohydrazide derivatives have been designed and synthesized. X-Ray structural analysis confirmed the formation of self-complementary hydrogen-bonded duplexes in all cases. Multiple intermolecular N–H⋯O hydrogen bonds play crucial roles in the formation of the duplexes and the evolution of meso-suprahelical structures in the solid state.