Q48 · CSIR-NET Chemistry, December 2018
Paper: CSIR-NET December 2018 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Marks: 2 · Difficulty: Medium
Match the following complexes with their $\mathrm{v}_{\mathrm{CO}}$ stretching frequency | Complex | $\mathrm{v}_{\mathrm{CO}}\left(\mathrm{cm}^{-1}\right)$ values |
|---|
| (A) $\mathrm{Mo}\left(\mathrm{PF}_{3}\right)_{3}(\mathrm{CO})_{3}$ | (I) 1835, 1934 |
| (B) $\mathrm{Mo}\left\{\mathrm{P}(\mathrm{OMe})_{3}\right\}_{3}(\mathrm{CO})_{3}$ | (II) 1888, 1977 |
| (C) $\mathrm{Mo}\left(\mathrm{PPh}_{3}\right)_{3}(\mathrm{CO})_{3}$ | (III) 2055, 2090 |
| (D) $\mathrm{Mo}(\text { pyridine })_{3}(\mathrm{CO})_{3}$ | (IV) 1746, 1888 |
(a)A-I, B-IV, C-II, D-III
(c)A-IV, B-III, C-I, D-II
(b)A-III, B-II, C-I, D-IV
(d)A-I, B-II, C-III, D-IV
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
The stronger the π-acceptor phosphorus ligand, the higher ν(CO): PF₃ (2055, 2090) > P(OMe)₃ (1888, 1977) > PPh₃ (1835, 1934) > pyridine (1746, 1888). A–III, B–II, C–I, D–IV.
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