GIANT PLATINUM CLUSTERS WITH ORGANIC-LIGANDS - PREPARATION AND CATALYSIS

Giant platinum clusters were prepared by a new method, i.e. by combina tion of the preparation of naked platinum clusters by photoirradiation of a hexachloroplatinic(IV) acid solution and the stabilization of th e naked clusters by addition of organic ligands. Platinum clusters sta bilized by 1,10-phenanthroline are more active as catalyst for both vi sible light-induced hydrogen generation from water and hydrogenation o f olefins than those stabilized by triphenylphosphine. The difference of activity is discussed by the term of coordination probability. (C) 1997 Elsevier Science S.A.