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The photolysis of dihaloamines (RNX2), viz., dichloramine-B (DCB) and dibroamine-B (DBB) in aq. acetic acid (1:1 vol./vol.) solns. has been studied with the UV light source (Î» = 2537 Ã…).  The exptl. rate law obtained is - d[RNX2]/dt = k' I0/[RNX2], where I0 is the intensity of incident light.  The addn. of benzenesulfonamide, the product of photolysis or uranyl ion had no significant effect on the rate of photochem. decompn.  A slight decrease in the rate has been obsd. by the addn. of NaCl/NaBr to DCB/DBB solns.  The quantum yield (Ï•) for the photolytic decompn. has been computed.  A suitable photolytic mechanism and a rate law consistent with the obsd. results have been proposed. [on SciFinder(R)

Determination of Quantum Yield for the Photochemical Decomposition of Dichloramine-B and Dibromamine-B in Aqueous Acetic Acid Medium