Effect of the coordination of π-acceptor 4-cyanopyridine ligand on the structural and electronic properties of<i>meso</i>-tetra(<i>para</i>-methoxy) and<i>meso</i>-tetra(<i>para</i>-chlorophenyl) porphyrin cobalt(<scp>ii</scp>) coordination compounds. Application in the catalytic degradation of methylene blue dye
RSC advances