Synthesis and electrochemical study of water-soluble lanthanide porphyrins

The water-soluble tetra-p-sulfonatophenylporphyrinatolanthanide, [Ln . TPPS . OH . 2imidazole] . 3H(2)O (Ln = Tb similar to Yb), were synthesized and characterized. Their stability and complex constants were also studied and determined. The structural formula of the lanthanide porphyrins was proposed too. The lanthanide atom is sitting above the porphyrin plane. For the lanthanide porphyrin complexes, the complex becomes more stable and the reduction potential has a slight shift to more positive values as the atomic number increases from Tb to Yb. The mechanism of electrode processes for these lanthanidee porphyrin complexes were investigated in details.Chemistry, AppliedSCI(E)EI0ARTICLE4251-2541