Q26 · CSIR NET Chemistry, December 2018
Paper: CSIR NET December 2018 · Subject: Inorganic Chemistry · Chapter: Bioinorganic Chemistry · Topic: Metal Toxicity Medicine · Marks: 2 · Difficulty: Medium
Match the items given below in the three columns:
Correct matches:
| Metalloprotein | Species coordinated to metal centre(s) | Resonance Raman O-O stretching frequency ($\mathrm{cm^{-1}}$) |
|---|---|---|
| (A) Oxymyoglobin | (I) $\eta^{2}:\eta^{2}-\mathrm{O}_2^{2-}$ | (X) 844 |
| (B) Oxyhemocyanin | (II) $\mathrm{HO}_2^{-}$ | (Y) 803 |
| (C) Oxyhemerythrin | (III) $\mathrm{O}_2^{-}$ | (Z) 1105 |
(a)A-III-Z, B-I-Y, C-II-X
(b)A-II-Y, B-I-X, C-III-Z
(c)A-III-Y, B-I-Z, C-II-X
(d)A-I-X, B-II-Y, C-III-Z
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Oxymyoglobin binds O₂ end-on as superoxide (O₂⁻, 1105 cm⁻¹); oxyhemocyanin holds a side-on μ-η²:η²-peroxide (≈750–800 cm⁻¹); oxyhemerythrin binds hydroperoxide HO₂⁻ (844 cm⁻¹). A-III-Z, B-I-Y, C-II-X.
Study loop for Bioinorganic Chemistry