Expanded coordination cavity stabilizes a high-spin Fe(III) state in a six-coordinate oxypyriporphyrin with mixed neutral/anionic axial ligation.
Oxypyriporphyrin (OxyPyP) possesses an unusually expanded N4 coordination cavity, yet its influence on the electronic structures of coordinated metal ions remains poorly understood. Herein, we investigate a series of OxyPyHEP-Fe(III) complexes with different axial-ligation environments to clarify how the expanded coord...