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The crystal and molecular structure of (me 3 CN) 3 (me 3 A1O)Sn4 has been determined from three-dimensional X-ray data (4-circle diffractometer, R - 0.048). The crystals are mono-clinic, space group P2i/c, with cell dimensions a = 1017.4(5), b - 1488.5(7), c = 1748(1) pm, β-91.5(1)° and Z - 4. The molecules approach 3m point-symmetry and include a Sn 4 N 3 O-cage, the atoms occupying the corners of a distorted cube formed by two, differently sized, interpenetrating concentric tetrahedra of tin and nitrogen/oxygen atoms. The nitrogen atoms are attached to tert-butyl groups, whereas the oxygen atom of the cage acts as a base towards the aluminiumtrimethyl group. Typical bond distances and angles (mean values) are: Sn-N = 219.9, Sn-0 = 220.3 pm; N-Sn-N = 81.2°; N-Sn-0 = 79.0°; Sn-N-Sn = 98.8° and Sn-O-Sn -100.2°.

zeitschrift für naturforschung b

Cyclische Diazastannylene, X [1] Die Kristall-und Molekülstruktur eines Moleküls mit verzerrt-würfelförmigem Sn 4 N 3 O-Käfig / Cyclic Diazastannylenes, X [1] The Crystal and Molecular Structure of a Molecule with a Distorted Cube-Shaped Sn 4 N 3 O-Cage