Stability constants for hypochloritoborate and hypobromitoborate complex ions in aqueous solution

Abstract

The formation of previously unreported hypohalitoborate complex ions in aqueous solution is described. The stability constant for the hypochloritoborate complex, β′={B(OH)₃OCl^–}/{HOCl}{B(OH)₃}(braces denote activity of the species), was found to be log β′= 2.25 ± 0.01 at 25 °C from a combination of spectrophotometric measurements at equilibrium and kinetic studies of the oxidation of the bromide ion. The corresponding constant (from equilibrium studies only) for the hypobromitoborate complex, B(OH)₃OBr^–, was log β′= 1.83 ± 0.04.