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[Ti(H 2 O) 6 ] 3+ shows an ansymmetrical broad absorption line explain it

[Ti(H2O)6]3+ shows an ansymmetrical broad absorption line explain it

Grade:12th pass

1 Answers

15 Points
10 months ago
The spectrum you observe is the transition from the ground state 2T2g to the excited state 2Eg of the octahedral aquo ion. It is allowed with respect to the spin rule (DeltaS = 0). The shoulder on the low-energy side is due to Jahn-Teller distortion of the excited 2Eg state. Jahn-Teller (JT) distortions occur when a non-linear molecule is in a degenerate electronic state. The molecule then distorts, its symmetry is lowered and the energy minimized. For Ti(III), d1, the JT distortion of the ground state is small, but the JT of the excited state is sizeable; the 2Eg state splits into 2A1g and 2B1g levels. The splitting is on the order of 2000 cm-1. The band at around 500 nm (20,300 cm-1) corresponds to the transition to 2A1g, the should at around 550 nm to the transition to 2B1g.

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