470455-19-7Relevant academic research and scientific papers
Intramolecular lithium cation solvation in the "active ligand periphery" of a tripodal triaminostannate
Lutz, Matthias,Galka, Christian,Haukka, Matti,Pakkanen, Tapani A.,Gade, Lutz H.
, p. 1968 - 1974 (2002)
The tris(aminosilyl)methane derivative HC{SiMe2NH(2-MeOC6H4)}3 (1) was reacted with three molar equivalents of n-butyllithium in pentane to give the solvate-free trilithium triamide HC{SiMe2N(Li)(2-MeOC6H4)}3 (2) for which an X-ray diffraction study established the internal solvation of the lithium ions. The trilithium triamide 2 was converted to the triamidostannate [HC{SiMe2N(2-MeOC6H4)}3SnLi] (3) by treatment of 2 with one molar equivalent of SnCl2. Both the NMR spectroscopic data obtained in solution and an X-ray structure analysis confirmed the intramolecular coordination of the lithium cation by the peripheral ortho-methoxy groups. Reaction of compound 3 with 0.5 molar equivalents of the dinuclear compound [Rh(COD)Cl]2 in toluene afforded the mixed heterodimetallic complex [HC{SiMe2N(2-MeOC6H4)}3 Sn(Li)-Rh(η4-C8H12)(Cl)] (4), for which a doublet resonance at high field in the 119Sn NMR spectrum (δ= -196.3; 1JSnRh = 871.6 Hz) confirmed the formation of a Sn-Rh bond. The X-ray structure analysis revealed that the Rh centre in 4 adopts a slightly distorted, square-planar coordination mode, with a tin-rhodium bond length of 2.6048(4) A, and that the chloro ligand is additionally bonded to the lithium cation. ( Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002).
