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Steric Control over Molecular Structure and Supramolecular Association Exerted by Tin- and Ligand-Bound Groups in Diorganotin Carboxylates

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posted on 27.10.2003, 00:00 by Dainis Dakternieks, Andrew Duthie, Douglas R. Smyth, Clynton P. D. Stapleton, Edward R. T. Tiekink
Structural data (X-ray and solution and solid-state 119Sn NMR) show that skew-trapezoidal-bipyramidal diorganotin compounds of 2-quinaldate are invariably monomeric, owing to the steric bulk of the carboxylate ligand. In contrast, most of the analogous compounds of 2-picolinate (2-pic) can increase their coordination number by polymerization or the incorporation of solvent in their coordination sphere in the solid state. The exceptional compound is tBu2Sn(2-pic)2 (3), for which no increase in coordination number is apparent, a result that is correlated with the bulky tert-butyl groups. Thus, judicious choice of tin or ligand substituents can be exploited to dictate coordination number and/or the degree of supramolecular aggregation in the investigated systems.