Which hexadentate chelating ligand is widely utilized in medical toxicology for the clinical treatment of acute lead poisoning?
Answer and explanation
Correct answer: A. Ethylenediaminetetraacetate ion (EDTA4-)
- Step 1: Ethylenediaminetetraacetic acid forms the hexadentate anion , which possesses two nitrogen donor atoms and four carboxylate oxygen donor atoms.
- Step 2: It wraps around heavy divalent metal cations to form exceptionally stable, water-soluble octahedral chelate complexes.
- Step 3: In lead poisoning, calcium disodium EDTA () is administered intravenously; lead replaces calcium due to higher binding affinity (), allowing safe excretion of lead in urine.
Answer
Ethylenediaminetetraacetate ion (EDTA4-)
Why not the others: 'Dimethylglyoximate (DMG-)' is a bidentate ligand used specifically in analytical gravimetry to precipitate nickel as a scarlet-red complex; 'Oxalate ion' is a bidentate ligand that precipitates insoluble calcium oxalate; 'Acetylacetonate' is a bidentate monoanionic ligand.
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