C-H bonds are not elongated by coordination to lanthanide metals: Single-crystal neutron diffraction structures of (C{sub 5}Me{sub 5})Y(OC{sub 6}H{sub 3}{sup t}Bu{sub 2})CH(SiMe{sub 3}){sub 2} at 20 K and (C{sub 5}Me{sub 5})La{l{underscore}brace}CH(SiMe{sub 3}){sub 2}{r{underscore}brace} at 15 K
Journal Article
·
· Journal of the American Chemical Society
The sterically hindered CH(SiMe{sub 3}){sub 2} alkyl group is ubiquitous in organolanthanide chemistry. Although close intramolecular contacts between CH(SiMe{sub 3}){sub 2} and a lanthanide have often been characterized by X-ray diffraction, conclusive evidence as to the exact nature of these interactions (i.e., {alpha}{sub CH}, {alpha}{sub CSi}, {beta}{sub SiC}, and {gamma}{sub CH}) requires accurate determination of all atomic coordinates, including those of the hydrogen atoms. The lack of detailed structural information contrasts sharply with the abundance of transition metal complexes showing well-defined agostic interactions. The authors report the first neutron diffraction studies of such lanthanide complexes on (C{sub 5}Me{sub 5})Y(OAr)CH(SiMe{sub 3}){sub 2} (OAr = O-2,6-C{sub 6}H{sub 3}{sup t}Bu{sub 2}) (1) and (C{sub 5}Me{sub 5})La{r{underscore}brace}CH(SiMe{sub 3}){sub 2}{r{underscore}brace}{sub 2} (2) which clearly show that the {beta}{sub SiC} agostic interaction predominates.
- Research Organization:
- Brookhaven National Lab., Upton, NY (US)
- Sponsoring Organization:
- US Department of Energy; Petroleum Research Fund; Netherlands Organization for Scientific Research
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 20014076
- Journal Information:
- Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 6 Vol. 121; ISSN JACSAT; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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