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Chemistry · L5 · Crystal Field Stabilization Energy: The Arithmetic and Its Payoff · flowchart

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by @openstemUpdated Chemistry
Octahedral d6 ione.g. Fe2+High spin: t2g4 eg2(weak field, e.g. H2O)Low spin: t2g6 eg0(strong field, e.g. CN-)CFSE = [-0.4(4) + 0.6(2)] Delta_o= -0.4 Delta_o(Delta_o ~ 10,400 cm-1: -4,160 cm-1)Raw CFSE = [-0.4(6) + 0.6(0)] Delta_o= -2.4 Delta_o+2P pairing correction(2 extra pairs vs high spin)Net CFSE = -2.4 Delta_o + 2P(Delta_o ~ 33,000, P ~ 17,600 cm-1:-44,000 cm-1)ComparestabilizationLow spin far more stabilizeddespite paying 2P — strong-fieldDelta_o gain outweighs pairing cost

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