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Bimetallic Pt/Rh colloids protected by NR 4  + - or PR 4  +  groups are accessible by the coreduction of PtCl 2  and RhCl 3  using hydrotriorganoborates in organic media. According to TEM the particle size ranges from 1.9 to 2.5 nm. EDX point analysis of several samples has shown that both metals are present in the particles. The metallic character of the Pt/Rh core confirmed by XANES, and EXAFS data clearly indicate the formation of nanometallic alloys. Colloidal Pt/Rh alloys prepared in this way are very soluble and highly stable in organic phases and serve as sources for heterogeneous hydrogenation catalysts.

The Preparation of Colloidal Pt/Rh Alloys Stabilized by NR 4 + - and PR 4 + -Groups and their Characterization by X-Ray-Absorption Spectroscopy