Ligand polydentate

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Hannah_1G
Posts: 100
Joined: Wed Sep 18, 2019 12:22 am

Ligand polydentate

Postby Hannah_1G » Sat Dec 07, 2019 3:56 pm

How do you figure out how many sites a ligand can bind to on a metal?

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

Re: Ligand polydentate

Postby Nohemi Garcia 1L » Sat Dec 07, 2019 4:04 pm

I'm not entirely sure, but I think it depends on the lone pairs within a molecule. Like water is a monodentate because it can only bond through oxygen which has 2 sets of lone pairs. With en (ethylenediamine) since it has multiple nitrogens with lone pairs, it is able to bond through multiple site, making it a polydentate.

Joowon Seo 3A
Posts: 100
Joined: Sat Aug 24, 2019 12:17 am

Re: Ligand polydentate

Postby Joowon Seo 3A » Sat Dec 07, 2019 4:42 pm

It depends on how many lone pairs the ligand has. For example, en has two nitrogen with lone pairs and is a bidentate.

Alan Cornejo 1a
Posts: 98
Joined: Fri Aug 30, 2019 12:15 am

Re: Ligand polydentate

Postby Alan Cornejo 1a » Sat Dec 07, 2019 9:49 pm

Nohemi Garcia 1I wrote:I'm not entirely sure, but I think it depends on the lone pairs within a molecule. Like water is a monodentate because it can only bond through oxygen which has 2 sets of lone pairs. With en (ethylenediamine) since it has multiple nitrogens with lone pairs, it is able to bond through multiple site, making it a polydentate.


So only one of the lone pairs on oxygen is used ?

Adelpha Chan 1B
Posts: 58
Joined: Thu Jul 25, 2019 12:15 am

Re: Ligand polydentate

Postby Adelpha Chan 1B » Sat Dec 07, 2019 10:49 pm

Alan Cornejo 1a wrote:
Nohemi Garcia 1I wrote:I'm not entirely sure, but I think it depends on the lone pairs within a molecule. Like water is a monodentate because it can only bond through oxygen which has 2 sets of lone pairs. With en (ethylenediamine) since it has multiple nitrogens with lone pairs, it is able to bond through multiple site, making it a polydentate.


So only one of the lone pairs on oxygen is used ?


Yes, only one oxygen is used. This is shown in the naming compound sheet linked in another post indicating the water molecule is OHO with the bond to the first oxygen


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