Polydentate

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salvadorramos3k
Posts: 72
Joined: Wed Sep 18, 2019 12:18 am

Polydentate

Postby salvadorramos3k » Sun Dec 01, 2019 9:34 pm

How can you tell when a molecule is polydentate?

Nohemi Garcia 1L
Posts: 103
Joined: Fri Aug 02, 2019 12:15 am

Re: Polydentate

Postby Nohemi Garcia 1L » Sun Dec 01, 2019 9:38 pm

A ligand is a polydentate when there are multiple molecules to that one ligand (like NH2CH2CH2NH which is a bidentate).

KarineKim2L
Posts: 100
Joined: Fri Aug 30, 2019 12:16 am

Re: Polydentate

Postby KarineKim2L » Sun Dec 01, 2019 9:39 pm

A ligand can bind at each lone pair. However, molecular shape must also be taken into account to see if the lone pairs are in a location that can be binded to another molecule. For example, Cl- has 4 lone pairs, but it cannot be a polydentate. It can only be a monodentate because its bond angles are 109.5 degrees, and therefore the other lone pairs cannot wrap around to bind.

Andrew Pfeiffer 2E
Posts: 101
Joined: Sat Sep 28, 2019 12:16 am

Re: Polydentate

Postby Andrew Pfeiffer 2E » Sun Dec 01, 2019 9:39 pm

The molecule in question is a polydentate when

a.) the ligand has at least 2 molecules that have lone pairs and

b.) the atoms have a geometry that enables the transition metal cation to be bound in more than one place at the same time.

lilymayek_1E
Posts: 107
Joined: Sat Aug 17, 2019 12:16 am

Re: Polydentate

Postby lilymayek_1E » Sun Dec 01, 2019 9:43 pm

polydentate ligands are ligands that bind to a central metal atom with more than one atom (more than 1 binding site, or more than 1 e- pair donated). EDTA is an example of this - a hexa(6)dentate ligand with six donor atoms, all with e- pairs that can bind to a central metal atom or ion.

Janet Nguy 2C
Posts: 115
Joined: Sat Aug 24, 2019 12:17 am

Re: Polydentate

Postby Janet Nguy 2C » Sun Dec 01, 2019 9:48 pm

Andrew Pfeiffer 1J wrote:The molecule in question is a polydentate when

a.) the ligand has at least 2 molecules that have lone pairs and

b.) the atoms have a geometry that enables the transition metal cation to be bound in more than one place at the same time.


what kind of geometries would allow for this?


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