Redox Gradations in Ruthenium Porphycene Complexes and the Porphyrin Analogs: Axial and Macrocyclic Ligand Effects

This paper reports synthesis and electrochemistry of six-coordinate ruthenium porphyrin isomers including six novel porphycene complexes with substituted pyridines in the axial positions, in which redox potential control of reversible Ru-II/R-III processes is successfully achieved over a 0.7-V potential region by varying the axial ligands and tetrapyrrole ligand structure and substituents.