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Chemistry · L5 · Ligand Field Theory: Spectrochemical Series, Spin State, and Jahn–Teller Distortion · flowchart

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by @openstemUpdated Chemistry
Octahedral d⁴–d⁷ ion+ ligand setCompare Δo (from thespectrochemical series)to pairing energy PΔo vs P?High spinHund's rule: fill eg singly firstt2g and eg both partly occupiedMax unpaired electronsLow spinPair up in t2g before eg is touchedt2g fills completely firstMin unpaired electronse.g. Fe(H2O)6 2+ (d6)Δo ≈ 10,400 cm-1t2g4 eg2 — 4 unpaired, paramagnetice.g. Fe(CN)6 4- (d6)Δo ≈ 33,000 cm-1t2g6 eg0 — 0 unpaired, diamagneticΔo < P weak-field ligandΔo > P strong-field ligand

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