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Synthesis, Structure, and Characterization of [RAl(μ-NHEt)(μ-NEt)2Si(NHEt)]2 (R=Me, Et)

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Kaskel,  Stefan
Research Group Kaskel, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Lehmann,  Christian W.
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Chaplais,  Gerald
Research Group Kaskel, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schlichte,  Klaus
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Khanna,  Meik
Research Group Kaskel, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Kaskel, S., Lehmann, C. W., Chaplais, G., Schlichte, K., & Khanna, M. (2003). Synthesis, Structure, and Characterization of [RAl(μ-NHEt)(μ-NEt)2Si(NHEt)]2 (R=Me, Et). European Journal of Inorganic Chemistry, (6), 1193-1196. doi:10.1002/ejic.200390154.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-98AD-0
Abstract
The reaction between tetrakis(ethylamino)silane, Si(NHEt)4 (1) and trialkylaluminium compounds AlR3 [R=Me (2), R=Et (3)] results in partial deprotonation of 1 and subsequent formation of a new dimeric alumosilazane in high yield. Single‐crystal X‐ray analyses reveal the structure of two new four‐membered ring compounds [RAl(μ‐NHEt)(μ‐NEt)2Si(NHEt)]2 [R=Me (4), R=Et (5)]. They are isostructural and crystallize in the triclinic space group P (No. 2) with a=8.3052(8)Å, b=9.8323(9)Å, c=10.324(1)Å, α=115.498(4)°, β=97.684(4)°, γ=94.382(4)° (4) and a=8.2319(3)Å, b=9.3748(5)Å, c=10.8221(6)Å, α=107.035(2)°, β=104.435(2)°, γ=94.375(2)° (5). The alternating edge‐ and corner‐sharing SiN4‐ and AlCN3‐tetrahedra represent a new structural motif with μ‐NHEt and μ‐NEt groups in one double bridge. The compounds were further characterized by elemental analysis, mass spectrometry, and NMR and IR spectroscopy.