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Chemical modifications of substituted groups, metal centers, and axial ligands on the porphyrinato metal complexes show various functionalities. Normal porphyrin complexes have sharp absorptions, around 400-500 nm, and the Q band around 500-700 nm which is a relatively weak absorption. Molar absorption coefficients of the Soret band are up to the order of 106 M/cm. The chlorophyll and porphyrinato zinc complexes hardly show energy relaxation of absorbed light, but easily show photoelectron transfer.
Ultra-high sensitive spectrophotometric reagent for Cu, Cd For the simultaneous determination of metals by HPLC