Diorganotin dications stabilized by neutral ligands in the solid state: [R2Sn(H2O)2(OPPh3)2](O3SCF3)2 (R = Me, Bu)
journal contribution
posted on 2003-01-01, 00:00 authored by J Beckmann, Dainis Dakternieks, Andrew DuthieAndrew Duthie, C MitchellThe synthesis of [R<sub>2</sub>Sn(H<sub>2</sub>O)<sub>2</sub>(OPPh<sub>3</sub>)<sub>2</sub>](O<sub>3</sub>SCF<sub>3</sub>)<sub>2</sub> (R = Me (1), Bu (<b>2</b>)) by the consecutive reaction of R<sub>2</sub>SnO (R = Me, Bu) with triflic acid and Ph<sub>3</sub>PO is described. Compounds <b>1</b> and <b>2</b> feature dialkyltin(IV) dications [R<sub>2</sub>Sn(H<sub>2</sub>O)<sub>2</sub>(OPPh<sub>3</sub>)<sub>2</sub>]<sup><sub>2</sub>+</sup> apparently stabilized by the neutral ligands in the solid state. Compounds <b>1</b> and <b>2</b> readily dehydrate upon heating at 105 and 86 °C, respectively. The preparative dehydration of <b>1</b> afforded [Me<sub>2</sub>Sn(OPPh<sub>3</sub>)<sub>2</sub>(O<sub>3</sub>SCF<sub>3</sub>)](O<sub>3</sub>SCF<sub>3</sub>) (<b>1a</b>), which features both bidentate and non-coordinating triflate anions. In compounds <b>1</b> and <b>2</b> the ligands Ph<sub>3</sub>PO and H<sub>2</sub>O are kinetically labile in solution and undergo reversible ligand exchange reactions. Compounds <b>1, 1a </b>and <b>2</b> were characterized by multinuclear solution and solid-state NMR spectroscopy, IR spectroscopy, electrospray mass spectrometry, conductivity measurements, thermogravimetry and X-ray crystallography.<br><br><br>
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