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The chemistry and the stereochemistry of poly(N-alkyliminoalanes)

1975; Elsevier BV; Volume: 87; Issue: 1 Linguagem: Inglês

10.1016/s0022-328x(00)80342-3

1872-8561

G. Perego, G. Del Piero, M. Cesari, Alessandro Zazzetta, G. Dozzi,

Biopolymer Synthesis and Applications

The compound [(HAlN-i-Pr)2(H2AlNH-i-Pr)3] has been prepared and the crystal and molecular structure determined by an X-ray analysis, carried out with three-dimensional data collected on a diffractometer. The molecule is made up of a cyclohexane-type ring, [(HAlN-i-Pr)2(H2AlNH-i-Pr)], in skewboat conformation, on each side of which is bonded an -H2AlNH-i-Pr- bridging unit between a nitrogen atom and an aluminum atom of the ring. The molecule lies on a binary axis of the crystal, but this symmetry is fulfilled only by a statistical orientation of the asymmetric molecular units (the statistical model is not however completely defined). The AlN bond lengths range from 1.901 to 1.985 Å; the average NC bond length is 1.527(9) Å. Main crystal data are: monoclinic space group C2/c; a = 10.15(2), b = 21.64(3), c = 12.84(2) Å, β = 111.9(5)°; Z = 4; calculated density 1.095 g/cm3. The structure was solved by direct methods and block-matrix least-squares converged to an R value of 5.6%.