N‐Confused Porphyrin‐aza‐Dipyrrin Chimera: A Versatile Metal Coordination Ligand Using its Unique NH Tautomerism

A novel N‐confused porphyrin (NCP) analogue bearing an external aza‐dipyrrin‐like coordination site was synthesized by a Schiff‐base forming reaction of N‐confused oxoporphyrin and 2‐aminopyridine derivatives. The chimera molecule enhances the intrinsic NH tautomerism of NCP to enable four possible tautomeric structures, three of which were identified by metal coordination. Getting confused: A novel N‐confused porphyrin (NCP) analogue bearing an external aza‐dipyrrin‐like coordination site was synthesized by a Schiff‐base forming reaction of N‐confused oxoporphyrin and 2‐aminopyridine derivatives. The structure of this chimera molecule enhances the intrinsic NH tautomerism of NCP to enable four possible tautomeric structures, three of which were identified by metal coordination.