THE REACTION OF COPPER AND CALCIUM DIPIVALOYLMETHANATES (CU(DPM)2 AND CA(DPM)2) WITH HYDROXYLS ON OXIDE SURFACE

Selective and stoichiometric reactions between surface hydroxyl groups (OH) on SiO2 and calcium dipivaloylmethanate (Ca(DPM)2) were investigated by infrared (IR) and photoelectron (XPS) spectroscopies. The stoichiometric ratio of initial surface OH and adsorbed Ca(DPM)2 is estimated from IR absorbance to be ca. (2-3): 1. Introduction of water vapor at 673 K to this surface results in the removal of ligand DPM from the adsorbed Ca(DPM)2, leaving the Ca on the surface. The reactive property of Ca(DPM)2 is identical to that of Cu(DPM)2, previously reported by us. A similar reaction on the surface of single crystal SrTiO3(100) with the Cu(DPM)2 is also carried out.