A general approach to NRmath image-stabilized metal colloids in organic phases


  • We thank Prof. R. Courths (Universität-Gesamthochschule Duisburg) for the XPS spectra obtained using an ESCALAB Mark II and Dr. B. Tesche (Fritz-Haber-Institut, Berlin) for TEM photographs with a Siemens Elmiskop 102 and DEEKO 100 at 100 eV. We are grateful to Drs. R. Brand and A. Freund (Degussa AG) for supplying commercial catalysts for comparison.


The stabilization of metal particles in a recent synthesis of colloidal transition metals was achieved by combining the stabilizing agent (NRmath image) with the reducing agent (NR4BEt3H). The disadvantages inherent to this method (the cost of the reducing agent synthesis and the need for stoichiometric amounts of stabilizing agent) have been overcome in the development reported here: NRmath image-stabilized (isolatable) metals of groups 6‒11 are produced by coupling the stabilizing agent to the metal salt that is to be reduced and reducing with simple inorganic and organic reducing agents. These isolatable colloid powders are precursors to highly active homogeneous and heterogeneous metal colloid catalysts.