In transition metal phosphine (M-PR₃) complexes, the back-bonding involves donation of electrons from

(a) M (t2 g) → PR₃ (σ*). Explanation: Back-donation from M t₂g into P–R σ* orbitals (a).

Q45 · CSIR-NET Chemistry, June 2015

Paper: CSIR-NET June 2015 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Electron Transfer Redox · Marks: 2 · Difficulty: Medium

In transition metal phosphine $\left(\mathrm{M}-\mathrm{PR}_{3}\right)$ complexes, the back-bonding involves donation of electrons from

(a)$\mathrm{M}\left(\mathrm{t}_{2 \mathrm{g}}\right) \rightarrow \mathrm{PR}_{3}\left(\sigma^{*}\right)$

(b)$\mathrm{M}\left(\mathrm{t}_{2 \mathrm{g}}\right) \rightarrow \mathrm{PR}_{3}\left(\pi^{*}\right)$

(c)$\mathrm{M}\left(\mathrm{e}_{\mathrm{g}}\right) \rightarrow \mathrm{P}(\mathrm{d})$

(d)$\mathrm{PR}_{3}(\pi) \rightarrow \mathrm{M}\left(\mathrm{t}_{2 \mathrm{g}}\right)$

Answer

Answer: A ✓ checked by 4AB · confidence high

Explanation

Back-donation from M t₂g into P–R σ* orbitals (a).

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