<i>N</i>,<i>C</i>,<i>N</i>‑Coordinated Stannylenes as Ligands in Ag(I) and Au(I) Complexes
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The intramolecularly N→Sn coordinated stannylene L(Cl)Sn (1), where L is {2,6-(Me2NCH2)2C6H3}−, has been used as a ligand for silver(I) and gold(I) compounds. The reactions of 1 with AgX (X = OAc, acac, and Hfac) proceeded as substitution reactions and generated in situ the stannylenes L(X)Sn and AgCl, subsequently giving the complexes [{L(OAc)Sn}·AgCl]4 (2), [{L(acac)Sn}·AgCl]4 (3), and [{L(Hfac)Sn}2·Ag(Hfac)] (4). In contrast, reactions of 1 with [(THF)Ag{HB(3,5-(CF3)2Pz)3}] and [(Me2S)·AuCl] proceeded without any evidence of chloride substitution and provided the complexes [{L(Cl)Sn}·Ag{HB(3,5-(CF3)2Pz)3}] (5) and [{L(Cl)Sn}·AuCl] (6). All complexes were characterized by multinuclear NMR spectroscopy, electrospray ionization mass spectrometry, and single crystal X-ray diffraction analysis. DFT calculations accompany the experimental work. While the theoretical studies suggested the presence of the Sn→Ag interactions in 2–5, the covalent nature of the Sn–Au bond was evaluated for 6.
