Redox Properties of Ruthenium Nitrosyl Porphyrin Complexes with Different Axial Ligation: Structural, Spectroelectrochemical (IR, UV-Visible, and EPR), and Theoretical Studies. Inorganic Chemistry, (47)16:7106--7113, 2008. [PUMA: axial complex effect effect;spectroelectrochem electrochem ligand ligation nitrosyl porphyrin reaction redox ruthenium study tetraphenylporphyrin]