Group 10 Metal Complexes of meso-Aryl-Substituted [26]Hexaphyrins with a Metal-Carbon Bond

Nickel(II), palladium(II), and platinum(II) complexes of meso-aryl-substituted [26]hexaphyrin have been prepared and structurally characterized. In mono-metalated complexes, the metal ion is commonly bound with three pyrrolic nitrogen atoms and one pyrrolic (beta)-carbon, whereas a bis-Pd(II) complex exhibits a unique structure involving a Pd-C (alpha)bond. These results reveal novel coordination abilities of the hexaphyrin that lead to a metal-carbon bond at either pyrrolic C(beta) or C(alpha) position.