Dimeric structures of zinc and copper complexes of malonamide-linked bisporphyrin

We have investigated the structures of zinc and copper complexes of malonamide-linked bisporphyrin. Two porphyrin moieties adopt anti-configurations in both complexes. The linker (malonamide) plays important roles: it is involving in both coordination bonds and hydrogen bonds with coordinated water in zinc complex; it is involving in both inter- and intra-molecular hydrogen bonds in copper complex. Those supramolecular interactions lead to dimeric structures in both complexes. The dimerization constant of the zinc species has been evaluated by NMR method.