Q14 · CSIR-NET Chemistry, June 2021

Paper: CSIR-NET June 2021 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Crystal Field Theory · Marks: 2 · Difficulty: Hard

For trigonal bipyramidal coordination complex (ML5) the correct point group symmetry and the relative order of the energies of the 3d orbitals in that crystal field, respectively are
(a)$\mathrm{D}_{3h}; \mathrm{d}_{x^2-y^2} > \mathrm{d}_{z^2} > \mathrm{d}_{xy} > \mathrm{d}_{xz}, \mathrm{d}_{yz}$
(b)$\mathrm{D}_{3d}; \mathrm{d}_{z^2} > \mathrm{d}_{xy}, \mathrm{d}_{x^2-y^2} > \mathrm{d}_{xz}, \mathrm{d}_{yz}$
(c)$\mathrm{D}_{3d}; \mathrm{d}_{x^2-y^2} > \mathrm{d}_{z^2}, \mathrm{d}_{xy} > \mathrm{d}_{xz}, \mathrm{d}_{yz}$
(d)$\mathrm{D}_{3h}; \mathrm{d}_{z^2} > \mathrm{d}_{x^2-y^2}, \mathrm{d}_{xy} > \mathrm{d}_{xz}, \mathrm{d}_{yz}$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
ML₅ trigonal bipyramid is D₃h; energies dz² > (dx²−y², dxy) > (dxz, dyz) (d).

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