Organometallic Clusters As Precursors for Metallic Nanoparticles: Effect of Cluster Size, Ligand Set, and Decomposition Method

Abstract

The pyrolysis of organometallic clusters containing osmium and/or ruthenium on a silica support leads to metallic nanoparticles in the 1 to 10 nm size range. The particle size obtained is correlated to the ligand set, and there are also indications that the shape of the cluster may have some effect on the shape of the nanoparticles obtained. In comparison, the size of nanoparticles obtained through thermolysis in a coordinating solvent are fairly independent of the nature of the organometallic precursor and tends to lead to aggregation of smaller, spherical nanoparticles into larger particles.

Nanostructured Materials Preparation via Condensation Ways

“…Pyrolysis of the cluster Os 2 (μ-I) 2 (CO) 6 gives rise to rod-shaped metal particles [398]. The organometallic polymer [Ru(CO) 4 ] 1 with a planar structure and zigzag-like conformation is a potential precursor for the synthesis of various nanomaterials, in particular, for the formation of chain nanoparticles, upon removal of the carbonyl ligand [399].…”

Cluster chemistry in the Noughties: new developments and their relationship to nanoparticles

“…Thus Gates has prepared very small (~0.6 nm) nanoparticles from [Os 3 (CO) 12 ] supported on MgO and calcined at 400 • C in vacuo, 77 while Leong reports larger (~1.5 nm) nanoparticles on silica using the same precursor and deposition temperature. 76 Interestingly, using larger clusters [Os 4 (CO) 12 (m-H) 4 ] or [Os 6 (CO) 18 ] under identical conditions leads to larger nanoparticles (ca. 1.7 and 1.9 nm respectively).…”

Synthesis and magnetic properties of nanostructured metallic Co, Mn and Ni oxide materials obtained from solid-state metal-macromolecular complex precursors

“…20 (iv) By comparison, pyrolysis of the metallic salts without the polymer present usually yields big agglomerated particles. 21,22 In this paper, we present the preparation of Mn 2 O 3 , Co 2 O 3 and NiO nanoparticles from coordination metal-polymer complexes which grow over graphite.…”