An octahedral Fe(II) N₆-donor complex undergoes spin crossover without changing composition or geometry. Its spin-only moments are √24 BM at 310 K and 0 BM at 90 K. On cooling:

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d⁶ changes from t 2 g ​ ⁴ e g ​ ² (four unpaired electrons, one pair) to t 2 g ​ ⁶ (three pairs). Two electrons move into t 2 g ​ , and the pair count rises by two.

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