Molecular tectonics: coordination networks based on porphyrins bearing pyridine N-oxide groups as coordinating sites

The combination of the two positional isomers 1 and 2, porphyrin backbones bearing two pyridine N-oxide groups (PNO), with Zn(II) cations leads to 1-Zn and 2-Zn self-complementary tectons which generate in the crystalline phase analogous 1-D zigzag type coordination networks with different metrics. In both cases, only one PNO group bridges the consecutive tecton through coordination to the Zn atom which adopts the square based pyramidal geometry.