Development kinetics of bimetal clusterns in solution

摘要

Pulse radiolysis of mixed solutions of two monovalent metal ions KAg(CN)_2 and KAu(CN)_2 has permitted to follow from nanosecond to second time-range the dynamics of the alloying proces between gold and silver and of the reactions of the alloyed cluster. The pulse induces the simultaneous ion reduction into silver and gold atoms. Then, through coalescence and association with excess ions, homolog or different, these coexisting atoms give rise the interval 2-20 sec the clusters are enriched in silver to the expenses of gold, the process being assigned to a slow intermetal electron transfer form gold atoms (less noble in the presence of CN) to silver ions adsorbed on clusters.