REDUCTION OF AG IN AQUEOUS POLYANION SOLUTION - SOME PROPERTIES AND REACTIONS OF LONG-LIVED OLIGOMERIC SILVER CLUSTERS AND METALLIC SILVER PARTICLES

Abstract

AbstractRadiolytic reduction of AgClO4 solutions containing a polyanion leads to the formation of long‐lived oligomeric silver clusters which are stabilized on the polymer chains. Under suitable conditions, the accompanying formation of colloidal silver consisting of metallic particles is strongly suppressed and cluster concentrations of several 10−4 M can be produced. In the presence of polyacrylate, the clusters are particularly long‐lived; they have absorption bands at 300 nm, 340 nm, and 370 nm. The bands of the latter two clusters are red‐shifted as compared to the bands of the unstabilized clusters or clusters stabilized by polyphosphate. The Ag24+ cluster, which is formed in the initi..