Please use this identifier to cite or link to this item: doi:10.22028/D291-24000
Title: The silicon effect in metallic silylamides
Author(s): Veith, Michael
Müller-Becker, Stefan
Weis, Johann
Lengert, A.
Engel, N.
Language: English
Year of Publication: 1994
OPUS Source: Organosilicon chemistry : from molecules to materials / ed. by Norbert Auner ... - Weinheim [u.a.] : Wiley-VCH,1994, S. 217-223
SWD key words: Silylamide
Verallgemeinerte Ableitung
DDC notations: 540 Chemistry
Publikation type: Book Chapter
Abstract: The alkoxysilazane tBuO-SiMe2-N(H)-CMe3 (1), which has a tert-butyl substituent at nitrogen and the corresponding trimethylsilyl derivative tBuO-SiMe2-N(H)-SiMe3 (2) can be transformed to amides of divalent transition metals. While (tBuO-SiMe2-N-CMe3)2Ni is blue and has a paramagnetism of 3.25 B.M., the corresponding (tBuO-SiMe2-N-SiMe3)2Ni is red and has a paramagnetism of 2.41 B.M. If Ni is substituted by Co the differences in B.M. of the two derivatives are even greater (4.05 B.M. versus 1.86 B.M.). The dilithium salt Me2Si(NCMe3)2Li2 reacts smoothly with PbCl2 to yield the metallacycle Me2Si(NtBu)2Pb, while in the case of the more silicon-rich amide Me2Si(NSiMe3)2Li2 a hetero-metallic amide [Me2Si(NSiMe3)2]2PbLi2 is obtained from the reaction with PbCl2. The latter procedure may be used to synthesize similar heterometallic silylamides. If in hexamethyldisilazane two of the methyl groups are substituted by t-butoxy-groups, an alkoxysilazane (tBuO)SiMe2-N(H)-SiMe2(OtBu) originates, which has chelating capabilities. A number of divalent metallic elements can be bound to the nitrogen, replacing hydrogen. All derivatives of the general formula [Me2Si(OtBu)]2N-M-N[(OtBu)SiMe2]2, M=Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Ba, behave as molecular compounds with no further organic base linked to the metallic element M. A comparision of different structures shows that the ligand [Me2Si(OtBu)]2N can adopt quite different chemical bonding.
Link to this record: urn:nbn:de:bsz:291-scidok-20228
Date of registration: 2-Feb-2009
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
NT - Chemie
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