Bitte benutzen Sie diese Referenz, um auf diese Ressource zu verweisen: doi:10.22028/D291-23853
Titel: Lithiumsalze des Tris(trimethylsilylamino)silans
Verfasser: Kosse, Peer
Popowski, Eckhard
Veith, Michael
Huch, Volker
Sprache: Englisch
Erscheinungsjahr: 1994
Quelle: Chemische Berichte. - 127. 1994, 11, S. 2103-2110
SWD-Schlagwörter: Lithiumsalze
Festkörper
Lösung
Silane
Silylamide
DDC-Sachgruppe: 540 Chemie
Dokumentart : Journalartikel
Kurzfassung: Amides, which result from the reaction of tris(trimethylsilylamino)silane (Me3SiNH)3SiH (1) with n-butyllithium in the molar ratio 1:1 and 1:2 in nonpolar solvents, form a system in which the aminosilane 1, the monoamide (Me3SiNLi)(Me3-SiNH)2SiH (2a), the diamide (Me3SiNLi)2(Me3SiNH)SiH (3), and the triamide (Me3SiNLi)3SiH (4) are in equilibrium. When the monoamide 2a is dissolved in THF only the dimeric monolithiated THF adduct 2b is obtained. An X-ray structure analysis of the lithium silylamide 2b reveals that in the dimeric unit one of the lithium atoms is coordinated by THF, the two lithium atoms thus differing in coordination number (3 versus 4). An X-ray study of the triamide 4 reveals a centrosymmetric polycycle. Multipole interactions are formed between the lithium and the nitrogen atoms. The reaction of the diamide 3 with chlorotrimethylsilane in boiling THF yields the cis isomer of the cyclic diamide [(Me3SiNLi)(Me3-SiNH)SiN(SiMe3)]2.2 THF (5) as a byproduct. According to an X-ray structure analysis of 5 the lithium centers are coordinated by one oxygen and three nitrogen atoms, which form a strongly distorted tetrahedron. The interactions between lithium and nitrogen atoms N(1) and N(2), which are part of the four-membered Si2N2 cycle, have to be considered as weak on the basis of the remarkably long Li-N distances (233 and 243 pm).
Link zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-18176
hdl:20.500.11880/23909
http://dx.doi.org/10.22028/D291-23853
SciDok-Publikation: 5-Dez-2008
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

Dateien zu dieser Ressource:
Datei Beschreibung GrößeFormat 
ve199401.pdf823,71 kBAdobe PDFÖffnen/Anzeigen


Alle Ressourcen in diesem Repository sind urheberrechtlich geschützt.