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. 2019 Oct 10;20(21):2742–2747. doi: 10.1002/cphc.201900853

Figure 3.

Figure 3

The effect of hydrostatic pressure on the spin gap of octahedrally coordinated Fe2+. For a charge neutral ligand field consisting i) of six hydrogen molecules ([Fe(II)(H2)6]2+, left), a spin transition occurs at 1.2 GPa, and ii) of five ammonia and one carbon monoxide molecules ([Fe(II)(NH3)5CO]2+, right), the low spin (singlet) state becomes energetically favored at an external pressure of approximately 0.14 GPa. The average metal‐ligand distance in the high spin (green triangles) and low spin (blue squares) states is given on the second y‐axis.