期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 2013, 期 28, 页码 4916-4921出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201300551
关键词
P ligands; Structure elucidation; Crystal structures; Cobalt; Halides
资金
- Swiss National Science Foundation
- Ecole Polytechnique Federale de Lausanne (EPFL)
Phosphane complexes of the putative formula [CoX2(dppe)] [X = Cl, Br, I; dppe = bis(diphenylphosphanyl)ethane] are frequently used catalyst precursors in cobalt-catalyzed reactions. Despite their widespread use, these complexes have not been structurally characterized. We demonstrate that synthetic procedures for [CoX2(dppe)] afford complexes of the formula [Co4X8(dppe)(5)] instead. Crystallographic analyses of these complexes reveal an ionic structure with pentacoordinate [CoX(dppe)(2)](+) cations and a dinuclear [Co2X6(dppe)](2-) anion. The bromido and iodido complexes crystallize in two forms, which differ in the geometry of the cation (square-pyramidal vs trigonal-bipyramidal).
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