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(top) Antibonding eg* orbitals of [Fe(NCH)6]2+. (bottom) Examples of electronic configurations corresponding to single and double eg occupations. A single eg* occupation occurs for the 1T1g, 3T1g, and 3T2g states, here shown for a triplet MC configuration. Double eg occupation occurs for quintet states (5T2g, HS). The character of triggered Fe–N vibrations upon electronic d → d excitation is also shown.
