Affiliations: Institut für Anorganische Chemie der Martin-Luther-Universität Halle- Wittenberg, Geusaer Str. D-06217 Merseburg, Germany | Department of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, England | Institut für Anorganische Chemie der Universität Leipzig, Linnéstr. 3 D-04103, Leipzig, Germany
Note: [] Corresponding author.
Abstract: Chiral dimethylindiumaminoalkoxides of general formula Me2InOR* [OR* = (+);(–)-2-piperidyl-methoxy (1), (+);(–)-dimethylamino-2-propoxy (2), (S)-(+)-amino-2-propoxy (3), (s)-α, α-diphenyl-2-pyrrolidinyl-methoxy (4)] have been prepared by reaction of Me3In with the corresponding aminoalcohols HOR* and characterized by 1H and 13C nmr spectroscopy and X-ray crystallography. Dimeric molecules of 1 – 4 are composed of two μ2-O-bridged chelating rings, the latter formed due to N — In donor-acceptor interaction. This geometry is comparable with that of aluminium and gallium analogues previously investigated. In the case of 1 and 4, the formation of the N — In bond proceeds stereospecifically. The absolute structure of 3 and 4 was confirmed by refinement of the Flack parameter. 1: C2/m; a = 15.999(3) Å, b = 9.803(2) Å, c = 7.410(1) Å, β = 111.04(3)°; Z = 2; density (calc.) = 1.586 Mg/m3; R1 = 0.026 for 944 independent reflections with F2 > 2σ(F2). 2: C2/c; a = 13.184(3) Å, b = 9.987(2) Å, c = 15.851(3) Å, β = 90.66(3)° Z = 4; density (calc.) = 1.573 Mg/m3; R1 = 0.021 for 1890 independent reflections with F2 > 2σ(F2). 3: P21; a = 8.701(2) Å, b = 11.944(2) Å, c = 8.831(1) Å, β = 113.26(3)° Z = 2; density (calc.) = 1.725 Mg/m3; R1 = 0.018 for 2873 independent reflections with F2 > 2σ(F2). 4: R3; a = 29.708(4) Å, c = 11.017(2) Å; Z = 9; density (calc.) = 1.265 Mg/m3; R1 = 0.034 for 5890 independent reflections with F2 > 2σ(F2).
