Q33 · CSIR-NET Chemistry, December 2018
Paper: CSIR-NET December 2018 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Jahn Teller · Marks: 2 · Difficulty: Medium
The correct set of electronic configurations for metal ions in octahedral coordination geometry for strong Jahn-Teller distortion is
(a)$t_{2g}^{6}e_{g}^{1}$, $t_{2g}^{3}e_{g}^{1}$, $t_{2g}^{6}e_{g}^{3}$
(b)$t_{2g}^{1}$, $t_{2g}^{3}e_{g}^{2}$, $t_{2g}^{6}e_{g}^{1}$
(c)$t_{2g}^{3}$, $t_{2g}^{3}e_{g}^{1}$, $t_{2g}^{3}e_{g}^{2}$
(d)$t_{2g}^{3}e_{g}^{2}$, $t_{2g}^{6}e_{g}^{2}$, $t_{2g}^{6}e_{g}^{3}$
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Strong (e_g) Jahn–Teller distortion: low-spin d⁷ t₂g⁶e_g¹, high-spin d⁴ t₂g³e_g¹ and d⁹ t₂g⁶e_g³.
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