Bromide ion reacts with NCl3 to generate NBrCl2 with the rate expression d[NCl3]/dt = 12[B ($) over bar r][NCl3] (M (s-1) at 25.0 degrees C, mu = 0.50 M). The NBrCl2 intermediate subsequently reacts with B ($) over bar r to give N-2, Br-2, and Cl- with the rate expression -d[NBrCl2]/dt = (0.05 + 5.3[B ($) over bar r])[NBrCl2]. The overall stoichiometry from pH 3.2 to 6.5 corresponds to 2NCl(3) + 6B ($) over bar r --> N-2 + 3Br(2) + 6Cl(-). Rate constants for NCl3 reactions show extreme sensitivity to nucleophilic strength with SO32- > CN- > I- much greater than B ($) over bar r. Aqueous absorption spectra are determined for NCl3 with maxima at 336 nm (epsilon 190 M(-1) cm(-1)) and 220 nm (epsilon 5320 M(-1) cm(-1)) and for NBrCl2 with a maximum at 228 nm (epsilon 4800 M(-1) cm(-1)). Spectral bands for NCl3, NBrCl2, NBr2Cl, and NBr3 shift systematically with the number of bromine atoms from 220 to 256 nm. The rate constants for the reactions of NHCl2 with Br-2, HOBr, and B ($) over bar r are much larger than that for the reaction of NCl3 with B ($) over bar r.