Synthesis and structural characterization of monomeric and dimeric aluminum amides

The synthesis and structural characterization of a trialkylaluminum amine adduct, Me(3)AlNH(2)tBu (1), four dimeric aluminum primary amides, [(Me2AlNHBu)-Bu-t](2) (2), [(Bu2AlNHPh)-Bu-3](2)(3), [(Bu2AlNH)-Bu-t(2,6-Pr-i(2))Ph](2) (4), [(Me3Si)(2)AlNHPh](2) (5) and a monomeric aluminium amide, Mes(2)AlN(SiMe3)(2) (6) are reported. Compounds 2 5 contribute to the relatively small number of structurally characterized primary amido complexes of aluminium. Compound 6 is one of a few examples of a monomeric, three-coordinate dialkyl aliminum amide. Crystal data: (1): Monoclinic, P2(1), a = 6.405(1), b = 10.742(1), c = 8.421(1)Angstrom, beta = 109.42(1)degrees, V = 546.41(12), Z = 2, with 671 refl. with F > 4.0 sigma F, R = 0.0451; (2): Monoclinic, P2(1)/na = 6.798(1), b = 12.273(1), c = 10.900(1)Angstrom, beta = 96.25(2)degrees, V = 904.0(2), Z = 4, with 867 refl. with F > 4.0 sigma F, R = 0.0568; (3): Triclinic, P-1, a = 9.393(1), b = 9.479(1), c = 10.891(1) Angstrom, alpha = 67.22(1), beta = 68.10(1), gamma = 61.57(1)degrees, V = 764.66(13), Z = 2, with 1602 refl. with F > 4.0 sigma F, R = 0.0464; (4): Monoclinic, P2(1)/n, a = 10.798(2), b = 19.375(2), c = 20.119(2) Angstrom, beta = 92.93(1)degrees, V = 4203.6(1), Z = 4, with 2316 refl. with F > 4.0 sigma F, R = 0.0723; (5): Triclinic, P-1, a = 8.823(2), b = 9.830(4), c = 11.498(4) Angstrom, alpha = 105.16(3), beta = 110.56(2), gamma = 96.43(2)degrees, V = 878.7(5), Z = 2, with 1341 refl. with F > 4.0 sigma F, R = 0.0593; (6): Triclinic, P-l, a = 8.146(2), b = 12.798(2), c = 13.912(3) Angstrom, a = 110.68(1), beta = 94.71(1), gamma = 91.71(1) degrees V = 1349.6(5), Z = 2, with 1730 refl. with F > 6.0 sigma F, R = 0.0593.