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Synlett 1992; 1992(6): 469-475
DOI: 10.1055/s-1992-21381
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Poly(pyrazolyl)borate Complexes of Tin(II) and Lead(II). The Quest for a Coordination Complex with a Stereochemically Inactive Lone Pair

Daniel L. Reger*
  • *Department of Chemistry University of South Carolina Columbia, South Carolina 29208, USA
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Publication Date:
08 March 2002 (online)

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The complexes [HnB(pz)4-n]mSnCl2-m (n = 0, 1 and 2; m = 1 and 2; pz = pyrazolyl ring), [HnB(pz)4-n]2Pb and [HB (3,5-Me2pz)3]2Pb have been prepared and structurally characterized. Both [B(pz)4]2Sn and [B(pz)4]2Pb are only four cooridnate, whereas [HB(pz)3]2Pb is six coordinate. In all three structures the lone pair on the metal is stereochemically active. The complex [HB(3,5-Me2pz)3]2Pb is six coordinate, and the geometry about the lead atom is a trigonally distorted octahedron. It is the first six-coordinate, main-group, molecular complex in which the lone pair is stereochemically inactive. 1. Introduction 2.Tin(II) Chemistry 2.1. Variable Temperature 1H NMR 2.2. 119Sn NMR Data 3. Lead(II) Chemistry 3.1. Variable Temperature 1H NMR 4. Conclusions