Abstract: The synthesis and the characterization of the metalloporphyrin complexes of the acetylacetonate, cerium(Ⅳ) with tetraphenylporphin (A) and tetra-p-chlorophenylporphin (B) have been described for the purpose of the study on inter-ation of cerium (Ⅳ) cation with both ligands acetylacetone (acac) and porphyrin. These compounds have been identified by elemental analyses, electron, infrared, Laser Raman and ¹H NMRspectra. The results indicated: the Ce(Ⅳ)-Ostreching vibrations in the infrared spectra of Ce(acac)₄ exhibits an absorption peak at 398cm^-1. The chemical shifts of its protons (H_d and H_e) in ₁H NMRspectra show 1.92 and 5.28 ppm, respectively. But in the porphyrin complexes of Ce (Ⅳ) ,they are shifted to high magnetic field for the enhanced shielding effect. The Ce(Ⅳ)-Ostreching frequency in the Laser Raman spectra of the tetra-p-chlorophenylporphin of Ce(Ⅳ) appears in 372cm^-1.The stoichiometric ratio of the porphyrin complexes of Ce(Ⅳ) is 1:1:2 (Ce (Ⅳ):A(B): acac) similar to that of the thorium porphyrin complex.

Key words: Metalloporphyrin complex, Quadrivalent cerium