Darstellung, Kristallstruktur und spektroskopische Charakterisierung von [(H₃C)₃Si]NH(BCl₂)

Preparation, Crystal Structure, and Spectroscopic Characterization of [(H₃C)₃Si]NH(BCl₂)

[(H₃C)₃Si]NH(BCl₂) is formed during the reaction of boron trichloride with hexamethyldisilazane at low temperatures. The compound crystallizes monoclinic in space group P2₁/c with a = 953.8(2) pm, b = 1059.9(1) pm, c = 867.4(1) pm, β = 99.40(2)°; Z = 4. According to the single crystal X-ray diffraction analysis (1275 symmetry independent reflections, R = 0.040), [(H₃C)₃Si]NH(BCl₂) exists as a dimer, in the crystal. The dimers have site symmetry C_i and, within the margins of error of the structure determination, point symmetry C_2h. A characteristic feature is a planar, almost square B–N–B–N four-membered ring with the trimethylsilyl groups in trans position. The compound has been characterised by MS-, ¹H-, ¹³C-, ¹¹B-, and ²⁹Si-NMR-spectroscopy.