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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: garnetwei on October 28, 2012, 04:48:10 AM

Title: sigma donor lead to high or low spin complex?
Post by: garnetwei on October 28, 2012, 04:48:10 AM

Since CN- is a sigma donor, so would (Co(CN)5)3- be high spin or low spin complex? how to explain? Can anyone help?

I just know that pi donor ligand will have high spin complexes...But, how about sigma donors?

Title: Re: sigma donor lead to high or low spin complex?
Post by: Schrödinger on October 28, 2012, 07:32:53 AM

CN^- is a strong ligand. Thus, the splitting between the set of degenerate d-orbitals is large. So how exactly will you fill the electrons for this particular system?

Title: Re: sigma donor lead to high or low spin complex?
Post by: garnetwei on October 28, 2012, 07:45:35 AM

The lower energy orbital will be filled up with electron first before filling up with higher energy orbital. So we will get low spin complex. Am i right?

Title: Re: sigma donor lead to high or low spin complex?
Post by: Schrödinger on October 28, 2012, 09:40:55 AM

Yes. It will be a low spin complex.

Title: Re: sigma donor lead to high or low spin complex?
Post by: garnetwei on October 28, 2012, 10:28:57 AM

Alrite...Thanks for your helps..XD...