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Synthesis And Characterization Of The Monomeric Diaryls M{C6H3-2,6-Mes2}2 (M = Ge, Sn, Or Pb; Mes = 2,4,6-Me3C6H2−) And Dimeric Aryl−Metal Chlorides [M(Cl){C6H3-2,6-Mes2}]2 (M = Ge Or Sn)

R. S. Simons, L. Pu, M. Olmstead, P. Power
Published 1997 · Chemistry

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The reaction of 2 equiv of LiC6H3-2,6-Mes2 (Mes = 2,4,6-Me3C6H2−) with GeCl2·dioxane, SnCl2, or PbCl2 in ether solution has resulted in the isolation of rare examples of monomeric, σ-bonded, diaryl derivatives M{C6H3-2,6-Mes2}2 (M = Ge (1), Sn (2), or Pb (3)). The compounds 1−3 are thermally stable, purple, crystalline solids with V-shaped geometries and remarkably wide (ca. 114.5°) interligand bond angles. The monoaryl metal chloride derivatives [M(Cl){C6H3-2,6-Mes2}]2 (M = Ge (4) or Sn (5)) were isolated by treatment of the appropriate dichlorides with either 1 equiv of LiC6H3-2,6-Mes2 or 1 equiv of the diaryls 1 or 2. The orange germanium compound 4 has a dimeric structure in which the monomers are linked by a relatively weak, 2.443(2) A, Ge−Ge interaction. In sharp contrast, its yellow tin analogue 5 has a dimeric structure in which three-coordinate tin centers are associated by asymmetrically bridging chlorides. The compounds 1−3 constitute a unique, structurally characterized diaryl series for Ge, S...



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