Lecture 19.2 - Applications of Tanabe-Sugano Diagrams:...

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1 Chem 172 Advanced Inorganic Chemistry Lecture 20/May 17 th Continued from Lecture 20 Electronic Spectra of Coordination Compound Applications of Tanabe-Sugano Diagrams: Determining Δ o from spectra Δ o can be determined depend on the d electron configuration of the Metal d 1 , d 4 (high spin), d 6 (high spin), d 9 d 1 d 4 (high spin) d 6 (high spin) d 9 Determining Δ o for d 1 , d 4 (h.s.), d 6 (h.s.), and d 9 confg. d 2 (or d 7 confg.) d 3 (or d 8 confg.) Δ o = the energy difference between 3 A2g and 3 T2g Δ o= [Energy of transition 3 T1g 3 A2g] – [Energy of transition 3 T1g 3 T2g] ν 1 3 T1g(F) 3 T2g ν 2 3 T1g(F) 3 T1g(P) ν 3 3 T1g(F) 3 A2g Example: [V(H 2 O) 6 ] 3+ has absorption at 17800 and 25700 cm -1 . Using Tanabe- Sugano diagram for d 2 , estimate values of Δ o and B for this complex. three possible spin-allowed transitios: ν 1 3 T1g(F) 3 T2g (lowest energy) ν 2 3 T1g(F) 3 T1g(P) ν 3 3 T1g(F) 3 A2g The ratio of energies of the absorption bands, 25700/17800 = 1.44 The ratio of energy of the higher energy transition(
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Lecture 19.2 - Applications of Tanabe-Sugano Diagrams:...

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