[ChermPrice]

I have a question about Tanabe-sugano calculations for low spin vs high spin complexes

for instance a hexaaquo complex would normally be high spin. I'd use the left side of the Tanabe sugano chart to find my best fit.

This paper my lab manual references uses the low spin side of the Tanabe-sugano to find it's best fit for a trisoxalate complex of cobalt ... http://i.imgur.com/hzSTZ.png

That chart is from the last page of here http://chemeducator.org/sbibs/s0010...s/1020115dm.pdf

I'm also wondering why do they get two peaks for their hexaaquo cobalt(III) complex since there's only one spin allowed transition. Is the other peak spin-forbidden? Shouldn't it then be really tiny?