☆ 4.5 Article

Iridium-Gold Cluster Compounds: Syntheses, Structures, and an Unusual Ligand-Induced Skeletal Rearrangement

ORGANOMETALLICS (2012)

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期刊

ORGANOMETALLICS
卷 31, 期 9, 页码 3588-3598

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AMER CHEMICAL SOC
DOI: 10.1021/om3001026

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Chemistry, Inorganic & Nuclear Chemistry, Organic

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  1. National Science Foundation [CHE-1111496, CHE-0840505]
  2. Molecular Graphics and Computation Facility in the College of Chemistry at the University of California, Berkeley
  3. Direct For Mathematical & Physical Scien
  4. Division Of Chemistry [1111496] Funding Source: National Science Foundation

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The new iridium-gold complex Ir-4(CO)(11),(Ph)(mu-AuPPh3), 1 was obtained from the reaction of the tetrairidium anion [Ir-4(CO)(11)(Ph)](-) with [Au(PPh3)][NO3]. Two new iridium-gold complexes Ir-4(CO)(10)(AuPPh3)(2), 2, and Ir-4(CO)(11)(AuPPh3)(2), 3, were obtained from the reaction of [HIr4(CO)(11)](-) with [Au(PPh3)][NO3]. Compounds 1-3 were structurally characterized by single crystal X-ray diffraction analyses. Compound 2 adds CO reversibly to form compound 3. In this process, the octahedral Ir4Au2 cluster of 2 is converted into the Au(PPh3)-capped Ir4Au trigonal bipyramidal cluster found in 3. Compounds 2 and 3 have been investigated by DFT computational analyses in order to understand the metal-metal bonding and the mechanism of their interconversion by CO addition and elimination. Compound 2 adds PPh3 to form the compound Ir-4(CO)(10)(PPh3)-(AuPPh3)(2), 4, which is structurally similar to 3. Compound 4 loses CO and benzene when heated to form the compound Ir-4(CO)(9)(mu(3)-PPhC6H4)(AuPPh3)(2), 5, which contains a triply bridging PPhC6H4 ligand.

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