Why is water always a monodentate?

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E_Villavicencio 2N
Posts: 26
Joined: Wed Sep 21, 2016 2:59 pm

Why is water always a monodentate?

Postby E_Villavicencio 2N » Sun Nov 20, 2016 3:24 pm

A ligand can use its lone pairs to bond in a coordination compound. Water has two lone pairs, why can't it be a bidentate? Can somebody explain that to me please?

Celine_Ngo_3L
Posts: 19
Joined: Sat Jul 09, 2016 3:00 am

Re: Why is water always a monodentate?

Postby Celine_Ngo_3L » Sun Nov 20, 2016 3:36 pm

Even though oxygen has two lone pairs, there would only be one binding site between water and the central metal because its bent shape prevents it from binding both of its lone pairs.

The lone pairs are both on the same atom (oxygen) and polydentate ligands form their bonds through lone pairs on different atoms.
Last edited by Celine_Ngo_3L on Sun Nov 20, 2016 3:37 pm, edited 1 time in total.

Ronica_Patel_3G
Posts: 10
Joined: Sat Jul 09, 2016 3:00 am

Re: Why is water always a monodentate?

Postby Ronica_Patel_3G » Sun Nov 20, 2016 3:37 pm

Both of the lone pairs are on the oxygen and oxygen binds only once to the central metal so it is mono dentate.


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