Coordination Number

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Polly
Posts: 10
Joined: Fri Sep 26, 2014 2:02 pm

Coordination Number

Postby Polly » Tue Dec 02, 2014 12:38 pm

How do you find out what the coordination number is without drawing out the molecule? For example with the molecule [Co(en)2]Cl3, why is the coordination number 6?

GinaYoung1L
Posts: 16
Joined: Fri Sep 26, 2014 2:02 pm

Re: Coordination Number

Postby GinaYoung1L » Tue Dec 02, 2014 3:38 pm

Are you sure it's not (en)3 rather than (en)2? Because the complex [Co(en)3]3+ is octahedral.

Sylvia Li
Posts: 10
Joined: Fri Sep 26, 2014 2:02 pm

Re: Coordination Number

Postby Sylvia Li » Sat Dec 13, 2014 11:53 pm

The coordination number should be the number of bonds that are formed with the main cation; en, or ethylenediamine, has 2 nitrogens, each with a lone pair that can be donated. Since it's a polydentate, more specifically a bidentate, if it is (en)2, then the coordination number should be 4. As Gina1L mentioned, it would have to be (en)3 for the coordination number to be 6.


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