Improved synthesis of monocationic μ-nitrido-bridged iron phthalocyanine dimer with no peripheral substituents

mu-Nitrido-bridged iron phthalocyanine dimers have attracted considerable attention because of their catalytic ability in alkane oxidation. However, clear and practical synthetic procedures for the simplest mu-nitrido-bridged iron phthalocyanine dimer with no peripheral substituents have not been reported because of its low solubility. In this study, we report improved synthesis and spectroscopic identification of the monocationic species of mu-nitrido-bridged iron phthalocyanine dimers that has no peripheral substituent groups. We observed that the use of iodine as an oxidant for the mu-nitrido-bridged iron phthalocyanine dimer prevents over-oxidation. Pyridine can dissolve its 1e(-)-oxidized monocationic species, which was characterized by H-1 NMR, C-13 NMR, IR, and UV spectroscopy as well as cyclic voltammetry.