Chelates Ligands what is the application of chelates

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Chelating Ligands 


   When Ligands containing two or more donor atoms simultaneously coordinate to a metal ion in such a way that a ring like structure is obtained then such ligands are called chelating ligands 

Application of chelates:-

Common application of chelates are -

(i) - some of chelates have biological importance for example :

1- Vitamin B¹² , a Cobalt complex is essential for human body .

2- Haemoglobin in red blood cells contains certain porphyrin complexes .

3-  Chlorophyll , the green pigment of plant leaf is a complex of magnesium .

4 - Metal poisoning caused by Pb,Cr,Cu,Ni,Zn,
etc in our body can be removed by treating with EDTA which forms complex with the above metal and is easily excreted in the urine.

(ii)- Standard EDTA, is widely used in volumetric analysis to determine the hardness of water . 

(iii)- Chelates are used in analytical chemistry.

(iv)- Chelating agents are added to the washing powders to improve their performance .

(v)- Chelates are used in the separation of actinides and lanthanides.

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