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(b) The UV-Vis spectrum of the doctahedral complex ion [Co"(NH3)6]2+ shows three main absorptions at 1,000 (21), 485 (22), and 459 (23) nm. 2A2,442,²11T18 4Ꭲ , 80 *T28 70 60 50 2T 28 2T 18 E/B 40 2F 30 AT 18 20 2G 4P 10 'T 1g 2T 28 0 10 40 50 20 30 Δ/Β
(i) Given that for [Co"(NH3)6]2+ A/B – 14.6, with reference to the Tanabe- Sugano diagram for d’octahedral complexes above reported, state whether the complex is expected to be high- or low-spin, identify the ground state and assign the absorption bands to the corresponding electronic transitions (hint: consider spin-allowed transitions only). [20 marks] With the aid of the Tanabe-Sugano diagram above reported, calculate the Racah parameter B, the crystal-field splitting energy 40 (in cm!) and the Crystal-Field Stabilization Energy (CFSE) for the ground state configuration of the complex [25 marks] (ii)