Evidence for alkane coordination to an electron-rich uranium center |
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Authors: | Castro-Rodriguez Ingrid Nakai Hidetaka Gantzel Peter Zakharov Lev N Rheingold Arnold L Meyer Karsten |
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Institution: | Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358, USA. |
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Abstract: | A series of five uranium-alkane complexes of the general formula (ArO)3tacn)U(alkane)].(cy-alkane) has been synthesized and crystallographically characterized. In all cases, X-ray diffraction studies revealed a pseudo-six-coordinate trivalent uranium core structure, (ArO)3tacn)U], with a coordinated alkane ligand at the axial position. The average U-C bond distance to the bound alkane was determined to be 3.798 A, which is considerably shorter than the sum of the van der Waals radii of the U atom and a CH2 or CH3 unit (3.9 A). In all complexes, the alkane is coordinated in an eta2-H,C fashion. |
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