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Coordination Chemistry III: Tanabe-Sugano Diagrams and ...

Coordination Chemistry III: Tanabe-Sugano Diagrams and Charge TransferChapter 11extra material (to finish Chapter 11)Symmetry Labels for ConfigurationsFree ion terms split into states in the ligand field, according to symmetry:The state labels also indicate the degeneracy of the electron configuration:d7 Tanabe-Sugano DiagramE/ B o/ B4F2G2Eg2T1g2A1g2T2g4P4A2g4T1g(4P)4T2g4T 1g(4F)Complexes with d4-d7electron counts are special at small values of o/Bthe diagram looks similar to the d2diagram at larger values of o/B, there is a break in the diagram leading to a new ground state electron configurationd7 Tanabe-Sugano DiagramE/ B o/ B4F2G2Eg2T1g2A1g2T2g4P4A2g4T1g(4P)4T2g4T 1g(4F)small oHigh Spinlarge oLow SpinComplexes with d4-d7electron counts are special at small values of o/Bthe diagram looks similar to the d2diagram at larger values of o/B, there is a break in the diagram leading to a new ground state electron configurationSample Problem, [Co(NH3)6]2+[Co(NH3)]

To solve this problem we first need to determine the d-electron count for the [Co(NH3)6]2+ complex. Co NH 3 6 2 6NH 3 Co 2 So we have cobalt(II). Since cobalt is in the ninth column of the Periodic Table, it must be a d7complex so we can use the d7 Tanabe-Sugano diagram from the last slide. Next we need to find ∆o/B: O B

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