Preparation and UV/vis, IR, MS, 1H NMR, cyclic voltammetry and molecular structures of two new Co(ii) complexes with para-methoxy-phenyl and para-chloro meso-porphyrins and 4-cyanopyridine ligand (1–2). Catalytic oxidation data of MB dye using 1–2.

The synthesis of the new meso-porphyrin tetrakis-[4-(benzoyloxy)phenyl]porphyrin (H 2 TPBP), the meso-{tetrakis-[4-(benzoyloxy)phenyl]porphyrinato}zinc(II) starting material [Zn(TPBP)] (1), and the 1,4-diazabicyclo[2.2.2]octane (dabco), pyrazine (pyz), 4,4′-bipyridine (4,4′-bpy), 4,4′-diaminodiphenylmethane (4,4′-mda), and 4-cyanopyridine (4-CNpy) coordination compounds with [Zn(TPBP)] (2-7) are described. The preparation of the dabco derivative in chlorobenzene leads to a crystalline monomeric five-coordinate zinc porphyrin species (2), whereas the synthesis in dichloromethane gives a five-coordinate zinc metalloporphyrin dimer (3) in the solid state. The pyrazine derivative crystallizes as a bis-pyrazine six-coordinate zinc metalloporphyrin (4). Complex 5 in the solid state is a dimer with 4,4′-bpy as a bridging ligand, whereas the 4,4′-mda species (6) is a five-coordinated monomeric zinc derivative in [a] 5004 Scheme 1. Schematic representations of the different coordination types for zinc porphyrins with bidentate N-donor ligands (L). Scheme 2. Bidentate N-donor ligands (aza ligands) used in this work.

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