Effect of the coordination of π-acceptor 4-cyanopyridine ligand on the structural and electronic properties of -tetra(-methoxy) and -tetra(-chlorophenyl) porphyrin cobalt(ii) coordination compounds. Application in the catalytic degradation of methylene blue dye.

To examine the influence of both the important π-acceptor character of the 4-cyanopyridine ligand and the nature of the -substituted phenyls of -porphyrins on the electronic, electrochemical and structural properties of cobaltous metalloporphyrins, we prepared and fully characterized two coordination compounds: the (4-cyanopyridine)[-tetra(-methoxyphenyl)porphyrinato]cobalt(ii) and the (4-cyanopyridine)[-tetra(-chlorophenyl)porphyrinato]cobalt(ii) with the [Co(TMPP)(4-CNpy)] and [Co(TClPP)(4-CNpy)] formulas (complexes 1-2). The solution structures of compounds 1-2 were confirmed by H NMR spectroscopy and mass spectrometry methods. They were further characterized by cyclic voltammetry and photoluminescence studies. The X-ray molecular structure data show that the Co-TClPP-4-NCpy derivative (2) exhibits high ruffling deformation compared to that of the Co-TMPP-4-CNpy species (1). Notably, the crystal packing of complex 1 shows the formation of Co⋯Co supramolecular dimers with a distance of 5.663 Å. As an application of our two cobaltous compounds, an investigation involving complexes 1-2 in the degradation of the methylene blue dye in the presence and absence of HO in aqueous solutions was carried out. These promising results show that 1-2 can be used as catalysts in the degradation processes of dyes.