Chelating vs Polydentate Ligands

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Ananta3G
Posts: 62
Joined: Wed Sep 18, 2019 12:19 am

Chelating vs Polydentate Ligands

Postby Ananta3G » Sat Dec 07, 2019 12:42 pm

Hello! I was just wondering if all chelating ligands are polydentate? Or vise versa? Also, what are the common chelating and/or polydenate ligands that we ought to know? Thanks!

AVerma_F19
Posts: 59
Joined: Thu Jul 25, 2019 12:15 am
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Re: Chelating vs Polydentate Ligands

Postby AVerma_F19 » Sat Dec 07, 2019 12:45 pm

A chelating ligand is one that binds to a cation in more than one location, thus it is polydentate.

Some of the common polydentate ligands are

oxalate (bidentate)
ethylenediamine (bidentate)
diethylenetriamine (tridentate)
ethylenediaminetriacetate (EDTA - hexadentate)
porphyrin (tetradentate)

Annie Chantasirivisal_4G
Posts: 94
Joined: Wed Sep 18, 2019 12:21 am

Re: Chelating vs Polydentate Ligands

Postby Annie Chantasirivisal_4G » Sat Dec 07, 2019 3:33 pm

AVerma_F19 wrote:A chelating ligand is one that binds to a cation in more than one location, thus it is polydentate.

Some of the common polydentate ligands are

oxalate (bidentate)
ethylenediamine (bidentate)
diethylenetriamine (tridentate)
ethylenediaminetriacetate (EDTA - hexadentate)
porphyrin (tetradentate)


I don't see porphyrin on the ligand names worksheet, did Dr. Lavelle ever mention it in his slides?

Megan_1F
Posts: 49
Joined: Thu Jul 25, 2019 12:16 am

Re: Chelating vs Polydentate Ligands

Postby Megan_1F » Sat Dec 07, 2019 5:10 pm

The porphyrin ligand is part of the heme complex in myoglobin. It is a tetradentate and a chelating ligand.


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