Q73 · CSIR-NET Chemistry, December 2019

Paper: CSIR-NET December 2019 · Subject: Inorganic Chemistry · Chapter: Inorganic Spectroscopy · Topic: Inorganic Spectroscopy – General · Marks: 2 · Difficulty: Medium

For an a an octahedral $\mathrm{Cu^{2+}}$ complex depicting axial EPR spectrum (g), the geometry of Cu and the orbital containing the unpaired electron are respectively
(a)Tetragonally elongated, $\mathrm{d}_{\mathrm{x}^{2}-\mathrm{y}^{2}}$
(b)Tetragonally compressed, $\mathrm{d}_{\mathrm{z}^{2}}$
(c)Tetragonally elongated, $\mathrm{d}_{\mathrm{z}^{2}}$
(d)Tetragonally compressed, $\mathrm{d}_{\mathrm{x}^{2}-\mathrm{y}^{2}}$
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
An axial Cu(II) spectrum with g∥ > g⊥ indicates tetragonal elongation with the electron in dx²−y² (a).

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