Coordination number

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Hanlin Zhu 4G
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Joined: Fri Sep 28, 2018 12:28 am

Coordination number

Postby Hanlin Zhu 4G » Thu Dec 06, 2018 8:06 pm

Does anyone know how to find the coordination number for complexes with polydentate ligands? For example, I know EDTA4- is a hexadentate and having octahedral structures when it binds to a metal cation, but I don't know if a complex such as [Fe(EDTA)]2- should be consider as having coordination number=1 or =6.

Posts: 69
Joined: Fri Sep 28, 2018 12:26 am

Re: Coordination number

Postby mbaker4E » Thu Dec 06, 2018 8:31 pm

The coordination number would be 6 because a single edta compound forms 6 bonds to the Fe atom, as it is hexadentate, and the number of bonds that are formed to the central atom make up the coordination number. Similarly, the bidentate compound en can form two bonds with a central atom.

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