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Sophia Dinh 1D
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Postby Sophia Dinh 1D » Sun Dec 01, 2019 11:48 pm

What is a chelate/chelating ligand?

Nare Arakelian Dis 3E
Posts: 58
Joined: Thu Jul 11, 2019 12:16 am

Re: chelate

Postby Nare Arakelian Dis 3E » Sun Dec 01, 2019 11:50 pm

Does it involve ligands that are polydentates? and is cisplatin a chelate?

Sophia Shaka 3L
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Re: chelate

Postby Sophia Shaka 3L » Mon Dec 02, 2019 7:09 pm

A chelating ligand is one that has the bonding motif below that Dr. Lavelle mentioned in class, in order to form multiple bonds to a transition metal cation. This structure is needed in order for the bonds to be physically close enough on the molecule to both/all reach the cation and bond to it. You can tell based on the structure whether a ligand will be a chelating ligand, because it must be polydentate and be an isomer with the right structure in order to chelate.
Here is the bonding motif:
atom with lone pair-spacer atom-spacer atom-atom with lone pair
These atoms with the lone pair(s) will create bonds with the TM cation.

Jamie Lee 1F
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Re: chelate

Postby Jamie Lee 1F » Mon Dec 02, 2019 8:16 pm

A chelate is a complex that has one or more ligands bonded to it that forms a ring around the central metal atom.

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Re: chelate

Postby Aprice_1J » Mon Dec 02, 2019 11:47 pm

How can you tell what is able to form a chelating complex? For example, in 9C.7, how does the different structure of diaminobenzene change the ability to form a chelating complex?

Posts: 54
Joined: Thu Jul 25, 2019 12:17 am

Re: chelate

Postby 905416023 » Mon Dec 02, 2019 11:49 pm

This is how I remember it, if the molecule looks like there is a ring on it, it is a chelate. What I mean by ring, is a string of atoms starting at the central atom, connecting to one another in a string type formation, and reconnecting to the central atom.

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