Abstract
A complete anisotropic EPR study of diphenylnitroxide imbedded in a benzophenone single crystal is presented. The 14N hyperfine tensors are Txx=1.9, Tyy=3.6, Tzz=23.8 G. The g tensors are gxx=2.0092, gyy=2.0056, gzz=2.0022, where x, y, and z lie along the N–O axis, the line drawn between the centers of phenyl rings, and a direction perpendicular to the x and y axes, respectively. The isotropic values obtained from the molten mixed crystal, a supercooled liquid, are aN=9.77 G, g=2.0055, a1H=a3H=1.86 G, a2H=0.87 G. The study implies that the unpaired π* electron is delocalized into the phenyl rings. The bonding character of the radical is discussed.
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