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Titel: The silicon effect in metallic silylamides
Verfasser: Veith, Michael
Müller-Becker, Stefan
Weis, Johann
Lengert, A.
Engel, N.
Sprache: Englisch
Erscheinungsjahr: 1994
Quelle: Organosilicon chemistry : from molecules to materials / ed. by Norbert Auner ... - Weinheim [u.a.] : Wiley-VCH,1994, S. 217-223
SWD-Schlagwörter: Silylamide
Amide
Verallgemeinerte Ableitung
DDC-Sachgruppe: 540 Chemie
Dokumentart : InBuch (Teil eines Buches)
Kurzfassung: 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 zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-20228
hdl:20.500.11880/24056
http://dx.doi.org/10.22028/D291-24000
SciDok-Publikation: 2-Feb-2009
Fakultät: Sonstige Einrichtungen
Fakultät 8 - Naturwissenschaftlich-Technische Fakultät III
Fachrichtung: SE - INM Leibniz-Institut für Neue Materialien
NT - Chemie
Fakultät / Institution:INM
SE - Sonstige Einrichtungen

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