Organotin(IV) hypervalent pseudohalides. Synthesis and structural characterization
作者:Cristina Coza、Adina Stegarescu、Răzvan Şuteu、Anca Silvestru
DOI:10.1016/j.jorganchem.2014.11.026
日期:2015.2
Tri- and diorganotin(IV) pseudohalides of type [2-(Me2NCH2)C6H4]R2Sn(NCE) [E = S, R = Me (1); E = Se, R = Me (2), Ph (3)] and respectively [2-(Me2NCH2)C6H4]RSn(NCE)(2) [E = S, R = Bu-n (4), Ph (5), 2-(Me2NCH2) C6H4 (6); E Se; R 2-(Me2NCH2) C6H4 (7)] were obtained by reacting the appropriateorganotin(IV) chlorides and alkali metal pseudohalides in stoichiometric amounts. The new species were characterized by multinuclear NMR (H-1, C-13, Sn-119 and Se-77 where appropriate), IR spectroscopy and mass spectrometry. Both the Sn-119 NMR and the X-ray diffraction studies evidenced the formation of Sn-NCE bonds in these compounds. For compounds 1-4, 6 and 7 the single-crystal X-ray diffraction studies revealed intramolecular Me2N -> Sn interactions and the formation of hypervalent species 10-Sn-5 in compounds 1-3 and 12-Sn-6 in 4, 6 and 7, respectively. Compounds 1-3 are monomeric species, with monodentate isochalcogenocyanato ligands, while in 4 one of the NCE- ligands behave as a bridging moiety, thus resulting in dimeric associations. Short pi CH gamma-CH2 center dot center dot center dot C-g and respectively C-g center dot center dot center dot C-g intermolecular contacts resulted in polymeric chains of dimmers in 4 and 3D supramolecular networks in 6 and 7, respectively. The reactions of [2-(Me2NCH2)C6H4]RSnCl2 and MECN in an 1:1 molar ratio resulted in the formation of a mixture of [2-(Me2NCH2)C6H4]RSnCl2, [2-(Me2NCH2)C6H4]RSn(NCE)(2) and [2-(Me2NCH2)C6H4]RSnCl(NCE) [E = S, R = Ph (8), 2-(Me2NCH2)C6H4 (9); E = Se, R = 2-(Me2NCH2)C6H4 (10)]. (C) 2014 Elsevier B.V. All rights reserved.