Abstract
The adduct SbCl 3·18-crown-6·MeCN has been synthesised and its structure determined by single crystal X-ray diffraction techniques. [Sb(C 12H 24O 6)Cl 3·CH 3CN], M r = 533.6, orthorhombic, Pnma, a = 19.473(6), b = 13.946(5), c = 8.032(3) Å, U = 2181.1(1.1) Å 3, Z = 4, D c = 1.625 g cm −3, λ(Mo Kα) = 0.71073 Å,μ(Mo Kα) = 16.7 cm −1, T = 293 K, F(000) = 1072, R = 0.0503 for 1383 unique observed reflections with I/σ( I)⩾2.0. In this molecular complex the crown ether possesses approximate D 3 d symmetry and is bonded by all six oxygen atoms to a pyramidal SbCl 3 unit resulting in a half-sandwich structure. The solvent (MeCN) molecule is trapped in the lattice and plays no part in the coordination geometry of the central Sb atom.
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