Abstract
The reaction between the triosmium cluster 1,2-Os3(CO)10(MeCN)2 and the diphosphine pincer ligand 4,6-bis(diphenylphosphinomethyl)-m-xylene (dppx) has been examined and found to yield the pincer-bridged cluster 1,2-Os3(CO)10(dppx) (2) as the major product, in addition to the pincer-bridged cluster 1,2-Os3(CO)10[1-diphenylphosphino-1-{(2,4-dimethyl-5-diphenylphosphinomethyl)phenyl}-propan-2-ol] (3) in trace amounts (<2% yield). Both cluster products have been isolated and their molecular structures determined by crystallographic analyses. The structural highlights of compounds 2 and 3, which represent the first examples of pincer-ligated metal clusters, are discussed. The origin of the functionalized diphosphine ligand in 3 is traced to the ethanol solvent that was used in the recrystallization of the dppx ligand.
Original language | English |
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Pages (from-to) | 1806-1811 |
Number of pages | 6 |
Journal | Journal of Organometallic Chemistry |
Volume | 692 |
Issue number | 9 |
DOIs | |
State | Published - Apr 1 2007 |
Externally published | Yes |
Funding
Financial support from the Robert A. Welch Foundation (Grant B-1093-MGR) is much appreciated, and the NSF/DMR (Grant 0420863-VN) is thanked for the purchase of the single-crystal X-ray diffractometer. Dr. Yongxuan Su (UCSD) is thanked for recording the mass spectral data on cluster 3 and the dppx/dppx′ sample.
Keywords
- Diphosphine ligand activation
- Diphosphine ligands
- Ligand substitution
- Osmium clusters
- Pincer ligands