Fig. 1

Synthetic route for the synthesis of (a) free-base porphyrin ligand and (b) its metalated (M = Ni(II), Zn (II), and Mn(II)) porphyrin complexes.

Synthetic route for the synthesis of (a) free-base porphyrin ligand and (b) its metalated (M = Ni(II), Zn (II), and Mn(II)) porphyrin complexes.