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Intramolecular Lithium Cation Solvation in the “Active Ligand Periphery” of a Tripodal Triaminostannate
Author(s) -
Lutz Matthias,
Galka Christian,
Haukka Matti,
Pakkanen Tapani A.,
Gade Lutz H.
Publication year - 2002
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200208)2002:8<1968::aid-ejic1968>3.0.co;2-2
Subject(s) - chemistry , ligand (biochemistry) , lithium (medication) , intramolecular force , medicinal chemistry , solvation , toluene , rhodium , inorganic chemistry , crystallography , stereochemistry , ion , organic chemistry , catalysis , biochemistry , medicine , receptor , endocrinology
The tris(aminosilyl)methane derivative HC{SiMe 2 NH(2‐MeOC 6 H 4 )} 3 ( 1 ) was reacted with three molar equivalents of n ‐butyllithium in pentane to give the solvate‐free trilithium triamide HC{SiMe 2 N(Li)(2‐MeOC 6 H 4 )} 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{SiMe 2 N(2‐MeOC 6 H 4 )} 3 SnLi] ( 3 ) by treatment of 2 with one molar equivalent of SnCl 2 . 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{SiMe 2 N(2‐MeOC 6 H 4 )} 3 Sn(Li)−Rh(η 4 ‐C 8 H 12 )(Cl)] ( 4 ), for which a doublet resonance at high field in the 119 Sn NMR spectrum (δ = − 196.3; 1 J SnRh = 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) Å, and that the chloro ligand is additionally bonded to the lithium cation. (© Wiley‐VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)