Abstract
We reported a stable meso-unsubstituted hexaphyrin, meso-free hexaphyrin, and its metal complexes. meso-Diketo hexaphyrin which is remarkably stable and can be manipulated like usual organic molecules was synthesized by the demetalation of the Ni complex. Its structure was determined by X-ray diffraction analysis to be meso,meso-diketo, non-Kekulé biradicaloid hexaphyrin. Singlet ground-state with non-Kekulé structure was revealed by ESR and SQUID measurements. The optical and electrochemical properties will be also reported.
