Question: [Ir(CN) 6 ] 3 has a regular octahedral structure. For K 3 [Ir(CN) 6 ], the wavenumbers corresponding to the CN stretching modes are 2167

[Ir(CN)₆]³⁻ has a regular octahedral structure. For K₃[Ir(CN)₆], the wavenumbers corresponding to the C≡N stretching modes are 2167 (A_1g), 2143 (E_g) and 2130 (T_1u) cm^–1.

(a) To which point group does [Ir(CN)₆]³⁻ belong?

(b) What would you observe in the IR spectrum of K₃[Ir(CN)₆] in the region between 2200 and 2000 cm^–1?

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