Polydentates and Chelates

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Princess Jereza 3C
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Joined: Sat Jul 20, 2019 12:16 am

Polydentates and Chelates

Postby Princess Jereza 3C » Sun Dec 01, 2019 7:08 pm

To clarify, polydentates are ligands with multiple bonding sites because of their lone pairs, and because of those multiple binding sites, they can create chelates by forming a ring around the central metal atom. Do chelates form because the polydentate ligands attach themselves together (that is probably wrong), or do the ligands place themselves next to each other designing themselves to make the shape of the chelate into a ring? Thanks

Posts: 54
Joined: Sat Aug 17, 2019 12:15 am

Re: Polydentates and Chelates

Postby NRobbins_1K » Sun Dec 01, 2019 7:13 pm

I think there might be a misunderstanding about the structure of a chelate. A chelate consists of one metal atom and one ligand- a single compound which can have multiple binding sites on the same metal atom. For example, a tetradentate ligand is one single compound that binds to one metal atom in four sites.

Alex Tchekanov Dis 2k
Posts: 118
Joined: Sat Aug 24, 2019 12:16 am

Re: Polydentates and Chelates

Postby Alex Tchekanov Dis 2k » Sun Dec 01, 2019 7:14 pm

The polydentate ligand binds to a central metal cation. Because polydentate ligands are normally long stands with multiple binding sites, the long molecule can bend and naturally arrange itself around the central atom, thus forming the chelate or ring-like structure.

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