Abstract
Measurements of the temperature dependence of the proton hyperfine coupling constants of a number of aromatic radicals in solution together with some measurements of the proton-to-deuteron coupling constant ratio are reported. These and data from the literature show the effects of out-of-plane CH vibrations. A relationship between the two types of measurements is demonstrated. Such vibrations lead to a small hyperfine coupling between the proton and spin densities on carbons adjacent to the one to which it is bonded. The implications of this effect are discussed.
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