Absorption Spectra of New Oxomolybdenum(V) Complexes of Tetraphenylporphyrin with Univalent Ligands

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Abstract
New tetraphenylporphyrin complexes, MoO(tpp)X (X=F, Br, BF4, NCO, N3, and NCS), are easily prepared from the complex, MoO(tpp)OC2H5, where TPP denotes meso-tetraphenylporphyrin. The complexes are confirmed to contain a central oxomolybdenum(V) group based on the IR and the ESR measurements. The visible absorption spectra of the complexes in dichloromethane have three main peaks, the Soret band, the α and the β bands. The degree of red shifts of the corresponding absorption maxima is found to increase in the order: X=OC2H54\simeqF3α/εβ. The correlation is also observed between the red shifts of the absorption peak around 330 nm and those of the Soret band. The complexes, MoO(tpp)X, are classified to d-type hyperporphyrin.