195455-48-2Relevant academic research and scientific papers
Synthesis and Properties of IrRe2(μ-H)2(CO)9(η5-C 9H7)
Comstock, Matthew C.,Prussak-Wieckowska, Teresa,Wilson, Scott R.,Shapley, John R.
, p. 4397 - 4404 (1997)
The slow addition of Re2(μ-H)2(CO)8 to a solution of Ir(CO)(η2C9H7) in hexane at reflux provides IrRe2(μ-H)2(CO)9(μ5-C 9H7) (1) in 80% yield. The molecular structure of 1 shows an IrRe2 triangle incorporating one Ir(CO)(η5-C9H7) and two Re(CO)4 fragments. The strongly different IT-Re distances suggest that one hydride ligand bridges one IT-Re edge and the other hydride bridges the Re-Re edge. Low-temperature 1H and 13C NMR spectra are consistent with this structure; at higher temperatures a dynamic process involving migration of one hydride ligand between the two Ir-Re edges is observed. Cluster 1 is readily deprotonated with KOH/ EtOH, and the resulting anion has been isolated as the PPN salt, [PPN][μ-H)(CO)9-C9H7)] (2). Both the 1H and low temperature 13C NMR spectra of 2 are consistent with a structure in which the remaining hydride ligand bridges the Re-Re edge. Variable-temperature 13C NMR spectra indicate that 2 undergoes CO scrambling localized on the Ir-Re edges. The reaction of 1 with PPh3 leads to IrRe2(μ-H)2(CO)8(PPh3)(η 5-C9H7) (3), which contains the phosphine on a rhenium atom, as well as to cluster fragmentation.
