Lithium Amidohydridoaluminates

The amidohydridometalates [Li(THF)4][HAl(NPh2)3] (1), [Li(DME)3][HAl{N(CH2Ph)2}3] (2), and [{(THF)3Li}{H2Al(N c Hex2)2}]·0.5toluene (3·0.5toluene; c Hex = C6H11) have been prepared by reaction of the corresponding amines with LiAlH4 in THF. For 2 recrystallization from DME is required to obtain crystals, suitable for X-ray diffraction. The new compounds have been characterized by elemental analyses, IR, NMR, and MS techniques, and X-ray structure analyses. According to this the anions of 1, 2, and 3·0.5toluene possess distorted tetrahedral coordination spheres. In 3·0.5toluene a Li···H contact of 184(4) pm was detected to complete the tetrahedral coordination of the Li+ center.