Determining if a ligand is polydentate

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Katie Clark 3B
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Joined: Fri Sep 25, 2015 3:00 am

Determining if a ligand is polydentate

Postby Katie Clark 3B » Sat Nov 14, 2015 12:57 pm

Can someone explain to me how to determine if a ligand is polydentate just by looking at its molecular formula? I am not sure how to identify them unless I write out the lewis structure. For example, HN(CH2CH2NH2)2.

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Re: Determining if a ligand is polydentate

Postby Chem_Mod » Sun Nov 15, 2015 4:14 am

The denticity of ligands listed in the course reader should simply be memorized. Generally, lone pairs are candidates for bonding to the metal, and multiple of these sites can bind to the same metal if they are spaced out by two or three "spacer" atoms. For example, the N-C-C-N motif in ethylenediamine. But there is no hard and fast rule.


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