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Coordination Compounds
Importance of Coordination Compounds in Biological Systems
1 question from 1 paper, each with its answer.
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Concepts tested
- Cobalt in cyanocobalamin
All Questions
2003 AIPMT 1 question
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Vitamin $B_{12}$ contains :Vitamin $B_{12}$ (cyanocobalamin) is a coordination compound of cobalt.
The cobalt is held in a corrin ring (similar to a porphyrin ring) by four nitrogen atoms, with a cyanide group and a nitrogen base as the other two ligands.
Cobalt is in the +3 oxidation state, Co(III).
Iron is present in haemoglobin, magnesium in chlorophyll, zinc in carbonic anhydrase.
So vitamin $B_{12}$ contains Co(III).