## Determining Shape

Alex Nguyen 3I
Posts: 100
Joined: Fri Sep 25, 2015 3:00 am

### Determining Shape

I know that most coordination compounds are either square planar, tetrahedral, or octahedral. I don't think we went too much over why since that goes into crystal field theory. The ligand $(en)_{3}$ is polydentate, and I think it forms an octahedral coordination complex. Can anyone explain the reasoning behind this?

Chem_Mod
Posts: 19582
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 888 times

### Re: Determining Shape

The most common geometry for coordination is octahedral. In this case there can be up to 6 bonds. Since each (en) makes 2 bonds, if you have three of them then all 6 bonds will be made (= octahedral)