Abstract

The Sn(IV) butyl complexes [Bu n SnCl 3 − n (NCN)] (NCN = [C 6H 3(CH 2NMe 2) 2-2,6] −, n = 1 ( 1), 2 ( 2), 3 ( 3)) were prepared. Spectroscopic analysis of 1– 3 by 1H and 119Sn NMR gave evidence for the presence of intramolecular N → Sn interactions in solution. The molecular structure of 1, as determined by a single-crystal X-ray diffraction study, revealed that it contained a six-coordinate Sn(IV) center with intramolecular N → Sn coordination of both ortho-amine substituents. Addition of SnCl 4 to 1 resulted in the isolation of the HCl adduct [BuSnCl 3(NCN +H)] ( 6). Reactions of 2 and 3 with SnCl 4 each resulted in the HCl salt [SnCl 4(NCN +H)] ( 8) and the corresponding butyltin chloride, Bu 2SnCl 2 and Bu 3SnCl, respectively. The formation of HCl adducts 6 and 8 was ascribed to transfer of the NCN ligand to SnCl 4 and the presence of HCl (from partial hydrolysis of the product or SnCl 4 during the work up procedure). The molecular structures of 6 and 8 have been determined through single-crystal X-ray diffraction and revealed the presence of a [BuSnCl 3(aryl)] − or [SnCl 4(aryl)] − stannate anion, respectively, with in each case one coordinated ortho-amine function and one protonated amine moiety involved in N–H⋯Cl–Sn hydrogen bonding in both compounds (2.14 Å for 6 and 2.18 Å for 8).

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