# Bond angles of OCl2 and OBr2

I have looked around and most of the sites suggest that bond angle of $\ce{OBr2}$ is greater than $\ce{OCl2}$ and it is explained by stating the electronegativity difference and looking at electron repulsion (VSEPR). However none of the websites actually give any experimental data so i am unsatisfied. I think that extent of back bonding would be more for $\ce{OCl2}$ and hence its bond angle should be greater.

Can someone please explain why i may be wrong and give experimental data on bond angle along with it?

• It is indeed larger, but the difference is only 1.1 degree. This is negligible and a lot of different effects could cause it. – permeakra Nov 22 '16 at 21:38
• – Jan Nov 22 '16 at 23:37
• I found some old data (J. Chem. Soc. A, p658,1968) on $\ce{Cl2O}$ which gives an experimental bond angle of $111^{\circ}$ and bond length of $171$ pm. There are several sites that quote an angle of $105^{\circ}$ for $\ce{Br2O}$ but don't say whether this is measured. – porphyrin Nov 23 '16 at 9:20