Four different porphyrin–imidedyads bearing different central metals (zinc or rhodium) and different substituents on the porphyrin macrocycles (tert‐butyl or methoxy) were synthesized for singlemoleculardiode measurements. The molecules were designed to separate the donor component (porphyrin) from the acceptor component (imide) by bonding in a perpendicular arrangement, thus enhancing the rectification