EDTA

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JamieVu_2C
Posts: 108
Joined: Thu Jul 25, 2019 12:16 am

EDTA

Postby JamieVu_2C » Thu Dec 05, 2019 3:18 am

Why don't you include the doubly bonded oxygen atoms when counting the sites where EDTA can bind to a transition metal? So, instead of 6 attachment sites, why can't there be 10, with the 4 included double bonded oxygen atoms?

Indy Bui 1l
Posts: 99
Joined: Sat Sep 07, 2019 12:19 am

Re: EDTA

Postby Indy Bui 1l » Thu Dec 05, 2019 4:05 pm

I think it is because the non-doublebonded Oyxgens have a -1 formal charge and the double bonded oxygens have a formal charge of 0. The -1 formal charge allows oxygen to want to bind. I also think that the double bonded oxygens are often on the other side of the bonded oxygens this could contribute to why they don't contribute to the coordinate complex.

Sanjana Borle 2K
Posts: 111
Joined: Fri Aug 09, 2019 12:15 am

Re: EDTA

Postby Sanjana Borle 2K » Thu Dec 05, 2019 4:17 pm

Also I believe that the singly bonded oxygens and the nitrogens have electron lone pairs that can form coordinate covalent bonds with said metal, so it chelates and binds to metals.

karinaseth_1A
Posts: 57
Joined: Sat Jul 20, 2019 12:15 am

Re: EDTA

Postby karinaseth_1A » Thu Dec 05, 2019 4:24 pm

Also, the doubly-bonded oxygens are part of a carbonyl group, which is a very stable group that does not want to accept more electrons. A carbonyl group is a carbon atom double bonded to an oxygen with two other atoms bonded to the carbon via single bonds.
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