9C.5 (7th ed)

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9C.5 (7th ed)

Postby Duby3L » Wed Dec 05, 2018 11:14 pm

Which of the following ligands can be polydentate? If the ligand can be polydentate, give the maximum number of places on the ligand that can bind simultaneously to a single metal center:
a)HN(CH2CH2NH2)2; b)CO3^2-; c)H20; d) oxalate

I know polydentate means that it has more than 2 regions to form rings, but can someone please explain in detail how to approach this question?

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Re: 9C.5 (7th ed)

Postby skyeblee2F » Wed Dec 05, 2018 11:23 pm

It always helps to draw the Lewis structure for each of these molecules first. If there appears to be multiple lone pairs that a single metal ion could attach to, then it is polydentate. I've attached a drawing of what the first one would look like, which is tridentate.

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Re: 9C.5 (7th ed)

Postby gwynlu1L » Fri Dec 07, 2018 1:59 am

You also have to consider the arrangement/structure of certain compounds to determine how many spots can bond to the metal center. For example, although water has 2 lone pairs that can potentially bind to the metal center, once one lone pair binds, the other one is not in a position to bind to the metal center, thus making water mono dentate.

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