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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 b hydrogens, were studied by 1H NMR spectroscopy. The results shown that b hydrogens in dimer and trimer were shielded by porphyrin ring greatly and displayed the complicated signal peaks.

Synthesis and nuclear magnetic resonance shielding effect of three triazine-linked porphyrin compounds