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Rhodium cluster complexes containing bridging phenylgermanium ligands.
Richard D Adams1, Jack L Smith
1Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA. Adams@mail.chem.sc.edu
Inorganic Chemistry
|June 7, 2005
Summary
This study reports the synthesis of novel rhodium cluster complexes featuring bridging germylene and germylyne ligands. These organometallic compounds were characterized using various spectroscopic and crystallographic techniques.
Area of Science:
- Organometallic Chemistry
- Inorganic Chemistry
- Materials Science
Background:
- Rhodium carbonyl clusters are important in catalysis and materials science.
- The incorporation of main group elements into metal clusters offers unique structural and electronic properties.
Purpose of the Study:
- To synthesize and characterize novel rhodium cluster complexes with bridging germylene and germylyne ligands.
- To investigate the reactivity of these new complexes with phosphine and carbon monoxide ligands.
Main Methods:
- Reaction of Rh(4)(CO)(12) with Ph(3)GeH under thermal and hydrogen conditions.
- Characterization using IR, NMR, elemental analysis, and single-crystal X-ray diffraction.
- Reactions of the synthesized clusters with PPhMe(2) and CO.
Main Results:
- Synthesis of two new rhodium-germanium clusters: Rh(8)(CO)(12)(mu(4)-GePh)(6) (9) and Rh(3)(CO)(5)(GePh(3))(mu-GePh(2))(3)(mu(3)-GePh)(mu-H) (10).
- Compound 9, a distorted cubic cluster, was formed with high yield under hydrogen.
- Reactions of 9 and 10 yielded further functionalized clusters, including tetraphosphine derivative 11 and a decarbonylated complex 12.
Conclusions:
- The first rhodium cluster complexes with bridging germylene and germylyne ligands have been successfully synthesized.
- The structural diversity and reactivity of these organometallic clusters have been demonstrated.
- These findings expand the scope of cluster chemistry involving main group elements and transition metals.