Water adsorption on platinum dioxide and dioxygen complex: Matrix isolation infrared spectroscopic and theoretical study of three PtO_2-H_2O complexes

摘要

The interactions of water molecule with platinum dioxygen complex and dioxide molecule are investigated by means of matrix isolation infrared spectroscopy and density functional calculations. The platinum atoms reacted with dioxygen to form the previously reported Pt(O_2) complex. The Pt(O_2) complex reacted with water molecule to give the Pt(O_2)-H_2O complex, which was characterized to involve hydrogen bonding between one O atom of Pt(O_2) and one H atom of H_2O (structure A). Upon visible light irradiation, the hydrogen bonded Pt(O_2···HOH complex rearranged to another Pt(O_2)-H_2O isomer (structure B), which involves (O_2)··OH_2 interaction. The Pt(O_2)-H_2O complex in structure B can be isomerized to the weakly bound platinum dioxide-water complex (structure C) under UV irradiation.