Absorption Spectra of Co(III) Complexes. I. Curve Analyses of the First and Second Absorption Bands

The measurements of the visible and ultraviolet absorption spectra of about fifteen Co(III) complex compounds have revealed that the first and second bands of these complexes are not symmetrical either on the scale of frequency or wave-length, and that these bands cannot be represented by the equation of Kuhn and Braun, nor of Lowry and Hudson. To fit the unsymmetrical absorption bands, a new experimental absorption equation has been developed and its adequacy substantiated. Some relationships between the first and the second bands of Co(III) complexes are also investigated.