Bromine chloride in the presence of chloride ion forms the dichlorobromate(1) ion, BrClz-, where K1 = [BrClz-]/ ([BrCl(aq)][Cl-1) = 6.0 M-I. Equilibrium constants (all at 25.0 "C, p = 1.00 M) are also determined for KZ = [Br2Cl-]/([BrCl(aq)][Br-]) = 1.8 x lo4 M-', for K3 = [Br2Cl-]/([Brz(aq)][Cl-]) = 1.3 M-' and for K4 = [Br3-]/ [Brz(aq)][Br-] = 16.1 M-'. UV absorption bands are resolved for BrC12-at 232 nm ( E 32 700 M-l cm-') and 343 nm ( E 312 M-' cm-'), for BrzC1-at 245 nm ( E 24 900 M-' cm-') and 381 nm (6 288 M-' cm-l), and for Br3-at 266 nm ( E 40 900 M-' cm-l). The W spectral properties of Clz(aq), CIS-, Brz(aq), and Br-are examined and compared. The reaction between Cl~(aq) and Br-to form BrC12-occurs at the diffusion-controlled limit; the rate constant, (7.7 f 1.3) x lo9 M-' s-', is measured by the pulsed-accelerated-flow method. The rapid formation of BrClz-can be used as an analytical method for trace bromide ion, where as little as mol % Br-can be detected in aqueous solutions of HCl or chloride salts.

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Several gold-based antiarthritic drugs are in widespread use.1 However, their structures,2 metabolism,3 transport,4 and modes of action5 are not well understood. Since sodium gold(I) thiomalate (Myochrisin) and gold(I) thioglucose (Solganol) both are amorphous solids, attempts to determine their molecular structures by crystallography have been frustrated. Recently we6 and Sadler,7

Patients who undergo hepatic arterial chemotherapy are not at an increased risk of developing hepatic arterial thrombosis or other hepatic arterial complications after orthotopic liver transplantation.

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