In transition metal phosphine (M-PR₃) complexes, the back-bonding involves donation of electrons from · ABC26IN0107

Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Electron Transfer Redox · Exam: CSIR NET 2014 · 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

Phosphines accept metal t₂g electron density into the P–R σ* orbitals (modern view, replacing P 3d) (a).

Study loop for Coordination Chemistry