chelating ligand

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Monica Soliman 3F
Posts: 97
Joined: Wed Sep 30, 2020 9:57 pm

chelating ligand

Postby Monica Soliman 3F » Wed Nov 25, 2020 5:55 pm

How can one figure out by looking at the molecular formula that a ligand is chelating? example: what he provided in the lecture
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Mikayla Kwok 3K
Posts: 99
Joined: Wed Sep 30, 2020 9:51 pm

Re: chelating ligand

Postby Mikayla Kwok 3K » Wed Nov 25, 2020 10:27 pm

I believe you would have to draw the lewis structure of the molecule first if given the molecular formula, but after that, you can find out whether the ligand has multiple atoms with attachment sites (lone pairs), single bonds for rotation abilities, and spacers between the atoms with lone pairs that would allow the ligand to bend and form rings. If the ligand has all these characteristics, it should be a chelating ligand.

Xavier Herrera 3H
Posts: 92
Joined: Wed Sep 30, 2020 9:37 pm

Re: chelating ligand

Postby Xavier Herrera 3H » Fri Nov 27, 2020 3:58 pm

Chelates need to have single bonds and lone pairs in their structures to be able to surround a TM in a ring shape. You can see that the four acetates in this structure are bonded to the N atoms with single bonds, and the N atoms have lone pairs. This single C-N bond will allow the molecule to rotate, and the lone pairs on the N's will bond to a TM like Co2+, making the compound a chelate.

Nina Tartibi 1F
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Joined: Wed Sep 30, 2020 9:58 pm

Re: chelating ligand

Postby Nina Tartibi 1F » Sun Nov 29, 2020 11:49 pm

You can identify a chelate if the structure of the molecule has more than one lone pair on the atoms in the structure. If it only has one lone pair, it is a monodentate.

Zach Richardson 2f
Posts: 68
Joined: Wed Sep 30, 2020 9:32 pm

Re: chelating ligand

Postby Zach Richardson 2f » Sun Nov 29, 2020 11:59 pm

Nina Tartibi 1F wrote:You can identify a chelate if the structure of the molecule has more than one lone pair on the atoms in the structure. If it only has one lone pair, it is a monodentate.

what is the functional difference between a chelate and a monodentate?

Nick Saeedi 1I
Posts: 107
Joined: Wed Sep 30, 2020 9:39 pm

Re: chelating ligand

Postby Nick Saeedi 1I » Mon Nov 30, 2020 12:25 am

It is chelating if it has more than one lone pair.

anikamenon2H
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Joined: Wed Sep 30, 2020 10:09 pm
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Re: chelating ligand

Postby anikamenon2H » Mon Nov 30, 2020 8:57 am

Chelating ligands are the ligands that can donate more than one lone pair (bidentate, tridentate etc.). A monodentate can only donate one lone pair and therefore cannot form a ring of atoms like the chelating ligands.

Hope this helps!

Pranav Daggubati 3C
Posts: 112
Joined: Wed Sep 30, 2020 9:35 pm

Re: chelating ligand

Postby Pranav Daggubati 3C » Mon Nov 30, 2020 9:26 am

Chelating ligands are those that have flexibility between binding sites and also have multiple binding sites, allowing for them to form at least 2 bonds with the metal cation.


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