Exo-pi-bonding to an ortho-carborane hypercarbon atom: systematic icosahedral cage distortions reflected in the structures of the fluoro-, hydroxy- and amino-carboranes, 1-X-2-Ph-1,2-C2B10H10 (X=F, OH or NH2) and related anions.
The structures of derivatives of phenyl-ortho-carborane bearing on the second cage hypercarbon atom a pi-donor substituent (F, OH, O-, NH2, NH- and CH2-) were investigated by NMR, X-ray crystallography and computational studies. The molecular structures of these compounds, notably their cage C1-C2 distances and the orientations of their pi-donor substituents (OH, NH2, NH- and CH2-) show remarkable and systematic variations with the degree of exo pi-bonding, which varies as expected with the pi-donor characteristics of the substituent.
Boyd
Lynn A
LA
Chemistry Department, Durham University Science Laboratories, South Road, Durham, UK.
Clegg
William
W
Copley
Royston C B
RC
Davidson
Matthew G
MG
Fox
Mark A
MA
Hibbert
Thomas G
TG
Howard
Judith A K
JA
Mackinnon
Angus
A
Peace
Richard J
RJ
Wade
Kenneth
K