Polydentate

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kellyz_1C
Posts: 33
Joined: Fri Apr 06, 2018 11:05 am

Polydentate

Postby kellyz_1C » Thu Jun 07, 2018 8:27 pm

How can you tell when a molecule is polydentate vs monodentate? ie; why isn't cyanide polydentate

Jessica Urzua-1H
Posts: 37
Joined: Tue Nov 14, 2017 3:01 am

Re: Polydentate

Postby Jessica Urzua-1H » Thu Jun 07, 2018 8:35 pm

A polydentate is able to bind to a metal at several different locations (elements/lone pairs) while a monodentate can only bind to a metal one element/lone pair at time. Cyanide is not a polydentate, because the metal can only bind to one of the lone pairs in the structure at a time, therefore making it a monodentate.

Fiona Grant 1I
Posts: 30
Joined: Fri Apr 06, 2018 11:03 am

Re: Polydentate

Postby Fiona Grant 1I » Fri Jun 08, 2018 3:38 pm

How exactly would you be able to identify where it can form a bond, in order to determine if it is polydentate? For example, how do you know that the molecule N(CH2CH2NH2)2 is tetradentate.

Natalie Noble 1G
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Joined: Thu Feb 01, 2018 3:02 am
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Re: Polydentate

Postby Natalie Noble 1G » Fri Jun 08, 2018 3:39 pm

An easy way to do this is to draw the structure and see if there are lone pairs, because that means it can bind to a metal at that site.
In N(CH2CH2NH2)3 all the N have one lone pair, and there are 4 N present, so it is tetradentate

princessturner1G
Posts: 31
Joined: Fri Apr 06, 2018 11:05 am

Re: Polydentate

Postby princessturner1G » Sat Jun 09, 2018 1:05 pm

There have to be two different atoms which have lone pairs for it to be polydentate, correct?

AnnaYan_1l
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Re: Polydentate

Postby AnnaYan_1l » Sat Jun 09, 2018 1:08 pm

Yes, I believe that multiple atoms in the compound would have to have lone pairs for it to be polydentate. It wouldn't be polydentate if a single N had 3 lone pairs, for example. Instead, it would be polydentate if multiple N had lone pairs.


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