REACTIONS OF SOME METHYLMETAL HALIDES OF ALUMINUM, GALLIUM, AND INDIUM WITH HEXAMETHYLDISILAZANE

MeAlCl2 or MeGaBr2, and bis(trimethylsilyl)amine form the dimeric, mix ed-substituted ring molecules (Me(Hal)M-III-N(H)SiMe3)(2) and one equi valent Me(3)SiHal. The NMR (H-1, C-13, Si-29) and vibrational spectra (IR, Raman) are measured and the X-ray structure analysis of the compo und with M-III = Al and Hal = Cl, has been done as well. Me2AlCl with an excess of HN(SiMe3)(2) forms the expected amide (Me2Al-N(H)SiMe3)(2 ), the homologue Me2GaCl with HMDS, however, gives at 50-55 degrees C only the cyclic (1:1) adduct (Me2Ga-N(H)SiMe3) (Me2GaCl). This complex crystallizes in the space group Cmc2(1), the unit cell consists of fo ur binucleate molecules with folded Ga-N-Ga-Cl-ring skeletons.