Abstract:
Single crystals of inclusion compounds formed between urea and aseries of aliphatic ethers were xirradi
ated and studied by electron spin resonance. The stable, x-ray-produced free radicals were all of the general
type RCHOR'. The approximate value for the spin density on the carbon atom is 0.70±0.10. The unpaired
spm distnbution is discussed in terms of the Hiickel and approximate configuration interaction ^--electron
molecular orbital models and the valence bond method. The theoretical spin distributions are found tobe
in qualitative agreement with the experimental spin distribution.