Poly(pyrazolyl)borate Complexes of Tin(II) and Lead(II). The Quest for a Coordination Complex with a Stereochemically Inactive Lone Pair
- 1 January 1992
- journal article
- account
- Published by Georg Thieme Verlag KG in Synlett
- Vol. 1992 (06) , 469-475
- https://doi.org/10.1055/s-1992-21381
Abstract
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. ConclusionsKeywords
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