Synthesis and characterization of Ir(H)(CO)(PEt3)(2)(eta(2)-C-60)

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The title complex, Ir(H)(CO)(PEt3)(2)(eta(2)-C-60) (2), has been prepared by the reaction of excess C-60 (4 equiv) with a tetrairidiurn complex Ir-4(CO)(8)(PEt3)(4) (1) in refluxing chlorobenzene in 40% yield as green crystals. Compound 2 has been characterized by cyclic voltarnmetry (CV), spectroscopic methods (mass, IR, H-1 and P-31 NMR), and a single crystal X-ray diffraction study. The molecular structure reveals that the iridium atom of 2 is coordinated by two axial ligands of a hydrogen atom and a carbonyl group, and three equatorial ligands of two phosphorus atoms and an eta(2)-C-60 moiety. The CV study exhibits three reversible one-electron redox waves for the successive reductions of 2, together with additional four redox waves due to free C60 reductions, which was formed by decomposition of 2 in the reduced states. The three reversible redox waves of 2 are shifted to more negative potentials by ca. 270 mV compared to free C-60, reflecting both metal-to-C-60 pi-back-donation and the electron-donating nature of the two phosphorus ligands.
Publisher
KOREAN CHEMICAL SOC
Issue Date
2007-11
Language
English
Article Type
Article
Keywords

TRANSITION-METAL-COMPLEXES; BUCKMINSTERFULLERENE C-60; CLUSTER COMPLEXES; DERIVATIVES; FULLERENES; COORDINATION; HYDRIDO; C60

Citation

BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.28, no.11, pp.1958 - 1962

ISSN
0253-2964
URI
http://hdl.handle.net/10203/90937
Appears in Collection
CH-Journal Papers(저널논문)
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