Neena Chakrabarti, W. Sattler, G. Parkin
Jul 13, 2013
Citations
0
Influential Citations
16
Citations
Journal
Polyhedron
Abstract
Abstract X-ray diffraction reveals that the molecular structures of the tris(pyrazolyl)hydroborato and tris(2-pyridylthio)methyl lithium compounds, [ Tp Bu t ,R ]Li (R = H, Me) and [κ4-Tptm]Li, respectively exhibit three-coordinate trigonal pyramidal and four-coordinate trigonal monopyramidal coordination geometries, both of which are uncommon for lithium. Accordingly, [ Tp Bu t ]Li and [ Tp Bu t ,Me ]Li bind additional ligands to form four-coordinate adducts, such as [ Tp Bu t ]Li(NCMe), [ Tp Bu t ,Me ]Li(NCMe), [ Tp Bu t ]Li( pz Bu t H ), [ Tp Bu t ,Me ]Li( pz Bu t H ) · ( pz Bu t H ), [ Tp Bu t ,Me ]Li(OH2), [ Tp Bu t ,Me ]Li(OH2)·(pzH) and [ Tp Bu t ]Li(OH2)·(THF), each of which has been structurally characterized by X-ray diffraction in the solid state. In solution, however, dissociation of the ligand (L) from the adducts [ Tp Bu t ,R ]LiL is facile such that the adducts exist in equilibrium with [ Tp Bu t ,R ]Li and L, as demonstrated by NMR spectroscopic studies.