# THE COLOR AND ELECTRONIC CONFIGURATIONS OF PRUSSIAN BLUE

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 Title: THE COLOR AND ELECTRONIC CONFIGURATIONS OF PRUSSIAN BLUE Creators: Robin, M. B. Issue Date: 1961 Publisher: Ohio State University Abstract: The intense color of the microcrystalline, inorganic dye Prussian blue, $KFe^{II} (CN)_{6} Fe^{III}$, is due to the transfer of an electron between iron ions, one of which is octahedrally surrounded by the carbon ends of the $CN^{-}$ ligands and assumes the strong field configuration while the other iron ion is octahedrally surrounded by the nitrogen ends of the $CN^{-}$ ligands and assumes a weak field configuration. Given the two types of iron ions, the problem then arises as to which ion anchors the optical electron orbital in the ground state and which anchors it in the excited state. The spectroscopic data can be rationalized using a simple orbital picture in which the iron ion in the carbon hole in the ground state is strong field $t_{2g}^{6}$ and in the transition, transfers an electron to the iron ion (weak field $t^{3}_{2g} e^{2}_{g}$) in the nitrogen hole. The unusually high intensity of the Prussian blue color band $(\epsilon = 9800)$ can be explained as due to a small amount of delocalization of the electrons in the ground state, brought about by configuration interaction. Description: Author Institution: Bell Telephone Laboratories Inc. URI: http://hdl.handle.net/1811/8037 Other Identifiers: 1961-B-11