J. L. Lefferts, K. Molloy, M. Hossain
Dec 28, 1982
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0
Influential Citations
45
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Journal
Journal of Organometallic Chemistry
Abstract
Abstract The crystal and molecular structure of trimethyltin(IV) chloride has been determined by the heavy-atom technique, and refined to a final R value of 0.041 for 1375 independent reflections (2θ 2σ(I)) recorded at 138 ± 2 K on a Nonius CAD-4 counter diffractometer. The crystals are monoclinic with space group I2/c; a 12.541(8), b 9.618(11), c 11.015(11) A, β 92.62(7)°, Z = 8, Dcalcd 1.994 g cm−3. The needle crystals are composed of polymeric chains of chlorine atoms bridging non-planar trimethyltin(IV) units at unequal (2.430(2) and 3.269(2) A) distances. The zig-zag chains are bent at chlorine (angle SnCl Sn 150.30(9)°), but nearly linear at tin (angle ClSn Cl 176.85(6)°) to describe a distorted trigonal bipyramidal geometry at tin with the trimethyltin groups eclipsed. The interchain d(Sn Cl) distances are greater than 4.1 A. The angles carbon—tin—carbon (mean 117.1(3)°) are larger than tetrahedral, while the angles carbon—tin—chlorine (mean 99.9(2) A) are smaller, in accord with isovalent hybridization principles, but more severely distorted than in the gas-phase, monomeric structure. The tin—chlorine distance of 2.430(2) A is also longer than in the gas phase monomer, and the intermolecular contact of 3.269 A is shorter than in other organotin chloride bridged systems (sum of Van der Waals radii 3.85 A).