The structure of amorphous bulk and silica-supported copper(II) hydroxides

The data obtained show that at pH 7 copper(II) ions are adsorbed on a SiO2 surface as polymeric species of hydroxide nature. The structure of these sp ecies is similar to that of the bulk amorphous copper hydroxide, The amorph ous state of supported Cu(OH)(2) is caused by a small (ca. 11 Angstrom) siz e of the surface particles. In contrast, the overstoicheometric water molec ules seem to act as "amorphizers" of the bulk copper hydroxide. The structu res of the bulk and dispersed amorphous copper(IT) hydroxide were determine d. The amorphous Cu(OH)(2) has a layered structure close to the structure o f the crystalline hydroxide, but the layers in the amorphous hydroxide are shifted toward one another approximately for 1/4 of the "c" period of the l attice, (C) 1999 Academic Press.