Homonuclear intervalence transitions

1 Homonuclear intervalence transitions involve single elements in different oxidation states. For example, electron transfer between Fe2+ and Fe3+ ions located in adjacent octahedral sites A and B, may be represented by  

Other possible examples of homonuclear IVCT transitions include Mn2+ — Mn3+ and Cr2+ — Cr3 IVCT transitions. 

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