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The cis-isomer of the silazane H 2 L (1) (L = [N t Bu][Me]Si(N t Bu) 2 Si[Me][N t Bu]) has been used as a ligand to main group metals. By displacing the hydrogen atoms of 1 the compounds L(MgMe) 2  (4), L(MgCl) 2  (5) and L(Li)(InMe 2 ) (6) have been obtained. According to the  1 H NMR spectra the structures of 4-6 are very similar: a polycyclic, cubane-like Si 2 N 4 M 2  framework results from the special atomic arrangements and from intramolecular Lewis acid-base interactions between the metals M and the nitrogen atoms. Divalent metals and metal-centered groups can also be incorporated into 1. In the latter case a seco norcubane-like polycycle Si 2 N 4 M is produced as confirmed by X-ray structure determinations of LGaMe (8) and LSb +  InCl 4  -  (11). LInMe (7) and LSn (9) seem to adopt the same tricyclic structure as 8, although the  1 H NMR spectra are not consistent with a rigid molecule (low symmetry), but rather with a fluxional behaviour (high symmetry). When 5 is allowed to react with sodium/naphthalene in THF part of the magnesium is reduced and LMg(THF) 2  (12) is formed. An X-ray structure determination of 12 reveals the compound to be only bicyclic with the magnesium atom coordinated by two nitrogen and two THF oxygen atoms.

zeitschrift für naturforschung b

Zur Koordination unterschiedlicher Hauptgruppenmetalle mit einem speziellen, chelatisierenden Silazan / On the Coordination of Different Main Group Metals with a Special, Chelating Silazane