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The I l B chemical shifts of either the isolated 1 :I complexes or, in the absence of the formation of solid adducts, the 1 : 1 mixture of the components, have been used to investigate the donor properties of nitro-and pentafluoronitro-benzenes towards boron halides in methylene dichloride solution. The I4N chemical shifts, obtained o n the same solutions, revealed no simple correlation w i t h the donor properties although the resonance line widths reflected the acceptor properties of the boron halides. The lQF chemical shifts of complexes of pentafluoronitrobenzene are also discussed.