Identification and characterization of a palladium ammine hydroxide complex: A preparative and replenishing agent for the Bell System palladium electrodeposition chemistry, Pallabell.
27 June 1988
A palladium ammine hydroxide complex, synthesized as an improved preparative and replenishing compound for the Bell System palladium electrodeposition technology "Pallabell", has been identified and characterized for its structure and solution chemistry. Unlike palladium chloride, PdCl(2,) which was originally used, this new compound is highly soluble, (~250 g/l-Pd), dissolves rapidly in the plating solution, avoids formation of insoluble PdO, prevents the accumulation of spectator ions (i.e. K(+) and Cl(-) and directly controls pH. The use of this compound will reduce cost, simplify maintenance and improve the efficiency of the process while increasing the longevity of the electroplating chemistry.