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Discuss briefly giving an example in eac...

Discuss briefly giving an example in each case, the role of coordiantion compounds in
(i) biologycal systems (ii) medical chemistry
(iii) analytical chemistry
(iv) extraction / metallurgy of metals

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(a) Many biologically important natural compounds, exist as coordinate complexes e.g. chlorophyil, haemoglobin. Haemoglobin acts as `O_(2)` carrier in the blood.
(b) Coordination compounds find use in many qualitative and quantitative chemical analysis. The familiar colour reactions given by metal ions with a number of ligands, e.g. EDTA, DMG, `alpha`-nitroso-`beta`-naphthol, cupron, etc. involve the formation of coordination compounds.
( c ) Many toxic metal fons are removed by the use of chelate therapy in medicinal chemistry, e.g. excess of copper and iron present in animal system are removed by the chelating ligands. D-penicillamine and desferrioxime B via formation of coordination compounds. EDTA is used in treatment of lead poisoning. cis-platin is used in cancer therapy.
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