EXAFS STUDY OF PLATINUM COORDINATION IN COMPOUNDS SYNTHESIZED BY COOPERATIVE EVAPORATION OF CARBON AND PLATINUM IN VACUUM

A series of platinum compounds has been synthesized by high-temperatur e carbon-platinum codeposition in vacuum. The concentration of platinu m atoms in the compounds ranges from 0.01 to 0.4 wt%. For the compound with 0.01% Pt concentration, the absence of the Pt-Pt bond has been r evealed and the Pt-C bond length and coordination number have been det ermined. In the remaining samples platinum atoms form metal clusters w ith diameter ranging from 10 to 19 Angstrom which is revealed by the E XAFS spectra.