Synthesis and Characterization of Ir(H)(CO)(PEt 3 }) 2 (η 2 -C 60 )

• Published in: Bulletin of the Korean Chemical Society 2007, 28(11), , pp.1958-1962
• Main Authors: Chang Yeon Lee, Gaehang Lee, Hongkyu Kang, 박보근, Joon T. Park
• Format: Article
• Language: English
• Subjects: 화학
• ISSN: 0253-2964; 1229-5949
• DOI: 10.5012/bkcs.2007.28.11.1958

The title complex, Ir(H)(CO)(PEt3)2(h2-C60) (2), has been prepared by the reaction of excess C60 (4 equiv) with a tetrairidium complex Ir4(CO)8(PEt3)4 (1) in refluxing chlorobenzene in 40% yield as green crystals. Compound 2 has been characterized by cyclic voltammetry (CV), spectroscopic methods (mass, IR, 1H and 31P 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 h2-C60 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 C60, reflecting both metal-to-C60 p-back-donation and the electron-donating nature of the two phosphorus ligands. KCI Citation Count: 2