SPECIAL SILAZANE DERIVATIVES OF DIGALLANE(4) AND DIINDIANE(4) WITH GA-GA AND IN-IN BOND

Al, Ga and In can easily be incorporated in the cyclic silazane (MeSi)2 (N(t)Bu)4H-2 (LH2) through formal substitution of the hydrogen atoms by the metallic elements. LAlMe, LAlCl, LGaCl, LInCl as well as the side product L(H)InCl2 are obtained in high yields. X-ray structure determinations confirm the molecules LAlMe and L(H)InCl2 to be polycyclic and the metallic atoms to be four-coordinated by intramolecular nitrogen donors. When LAlCl, LGaCl and LInCl are reduced by sodium naphthalene, in the two latter cases the formation of LGa-GaL and LIn-InL is observed. An X-ray structure determination of LIn-InL shows an In-In bond of 2.768(1) angstrom with the two indium atoms being coordinated by three nitrogen atoms each (In-N ranging from 2.12(1)-2.298(7) angstrom). LGa-GaL and LIn-InL can be considered as the first amides of Ga(II) and In(II).