Three porphyrin compounds, monomer Por I, dimer Por II and trimer Por III have been synthesized from the reaction of cyanuric chloride, 5-(4-hydroxyphenyl)-10,15,20-triphenyl porphyrin and 1-phenylpiperazine. The properties of these novel porphyrins in nuclear magnetic shielding, the shift, coupling and splitting of beta hydrogens, were studied by ¹H NMR spectroscopy. The results shown that beta hydrogens in dimer and trimer were shielded by porphyrin ring greatly and displayed the complicated signal peaks.
porphyrin dimer; porphyrin trimer; synthesis; 1H NMR; shielding effect
