The tetrameric alkylimido-methylgallanes (MeGa-NR)(4) (R = CH(CH3)(2)
(corresponding to Pr-i), C(CH3)(3) (corresponding to (BU)-B-t) and Me
= CH3) have been prepared by pyrolyses of the dimeric amido compounds
(Me(2)Ga-N(H)R)(2) at 250-260 degrees C. The mass, NMR and vibrational
spectra are discussed, they prove almost identical structures of the
skeletons. The X-Ray structure determination of (MeGa-N(t)Bu)(4) shows
four heterocubane molecules in the trigonal unit cell (space group <P
(3)over bar cl>, a = b = 1061.7(1), c = 3191.8(5) pm) and two disorder
ed benzene solvate molecules. The Ga-N bonds range between 198.4 to 19
9.9 pm, the Ga-N-Ga and N-Ga-N bond angles lie between 90.6 to 91.4 an
d 88.6 to 89.2 degrees, respectively. The structure was refined to an
R(1)(R(2))-value of 0.049 (0.057).