Determining Denticity

Moderators: Chem_Mod, Chem_Admin

Abigail Yap 2K
Posts: 51
Joined: Fri Sep 29, 2017 7:07 am

Determining Denticity

Postby Abigail Yap 2K » Fri Dec 08, 2017 10:35 pm


I know this question has already been asked, but I am still unsure about this topic. How do we determine whether a molecule is monodentate, bidentate, etc. based on its formula? The examples given in review session were solved using Lewis structures, but I do not understand how we can know the structures of larger, more complicated molecules.

Thank you!

Ayona Sengupta
Posts: 16
Joined: Fri Sep 29, 2017 7:07 am

Re: Determining Denticity

Postby Ayona Sengupta » Fri Dec 08, 2017 10:41 pm

An easier way to look at this is to just keep an eye out for Ns and COOs. Count each of those as a possible binding site. A monodentate has one, bidentate has two etc.
For example:
NH3 is a monodentate.
(CH2N(CH2COO-)2)2 is a bidentate.
HN(CH2CH2CH(CH3)2 is a tridentate.

Posts: 71
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 1 time

Re: Determining Denticity

Postby GabrielGarciaDiscussion1i » Fri Dec 08, 2017 10:50 pm

One trick that I use, although it may not be "educated", is look for Nitrogen molecules. If the nitrogen has only 3 bonds, this means it has a lone electron pair that can serve as a binding site.
Next, look for Oxygen molecules that are single bonded and have a negative 1 charge and these can serve as a binding site as well.

Return to “Shape, Structure, Coordination Number, Ligands”

Who is online

Users browsing this forum: No registered users and 1 guest