Single atom bridged porphyrin dimers, and a possible carbon sandwich

Abstract

An orbital diagram constructed for N₄M–X–MN₄ where N₄ is a model for a porphyrin ring, M a transition metal, and X a monatomic bridge (O, N, or C) accounts for the electronic structure and bending preferences of the X = O and N species and predicts a closed shell for the carbido bridged complex.