Abstract
The effects of deprotonation on the spin distribution of 1-naphthol (1-ROH) in the lowest excited triplet (T{sub 1}) state have been studied by the parallel-polarized ESR technique. The proton hyperfine structures in {Delta}M{sub s} = {plus minus}2 transitions have been observed for the T{sub 1} states of 1-ROH and 1-naphtholate (1-RO{sup {minus}}) in random rigid solutions of ethanol at 77 K. The {alpha}-proton hyperfine splitting of 1-RO{sup {minus}} is smaller than that of 1-ROH. With the aid of the spin-density calculation within McLachlan's approximation, the effect of deprotonation on the spin densities at the {alpha}-carbon atoms of 1-ROH in the T{sub 1} state is discussed. This is the first report of the proton hyperfine structure of a T{sub 1} organic molecule in an ionic form.
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