The spectral behavior of Co II metalloporphyrin and Fe II metallophthalocyanine in the visible region can be described by their electronic absorption spectra, which are influenced by their coordination geometry.For Co II metalloporphyrin, the electronic spectra typically show a strong Soret band in the 400-450 nm region and weaker Q bands in the 500-600 nm region. The Soret band arises from the * transition within the porphyrin ring, while the Q bands are attributed to the transitions involving the metal d-orbitals. The coordination geometry of Co II in metalloporphyrin is usually square planar, with the metal ion coordinated to the four nitrogen atoms of the porphyrin ring. This geometry leads to a splitting of the d-orbitals, which in turn affects the energy levels and the observed electronic transitions.Fe II metallophthalocyanine exhibits a similar spectral behavior, with a strong Soret-like band in the 600-700 nm region and weaker Q-like bands in the 700-800 nm region. The electronic transitions in Fe II metallophthalocyanine are also influenced by the coordination geometry of the metal ion. In this case, the Fe II ion is coordinated to the four nitrogen atoms of the phthalocyanine ring in a square planar geometry. This leads to a splitting of the d-orbitals and affects the energy levels and electronic transitions observed in the visible region.In summary, the spectral behavior of Co II metalloporphyrin and Fe II metallophthalocyanine in the visible region is characterized by strong Soret bands and weaker Q bands, which are influenced by their coordination geometry. The square planar geometry of the metal ions in both complexes leads to a splitting of the d-orbitals, which in turn affects the energy levels and electronic transitions observed in their electronic spectra.