Structural characterization of tris(pyrazolyl)hydroborato and tris(2-pyridylthio)methyl lithium compounds: Lithium in uncommon trigonal pyramidal and trigonal monopyramidal coordination environments

被引：18

作者：

Chakrabarti, Neena ^{[1
]}

Sattler, Wesley ^{[1
]}

Parkin, Gerard ^{[1
]}

机构：

[1] Columbia Univ, Dept Chem, New York, NY 10027 USA

来源：

POLYHEDRON | 2013年 / 58卷

基金：

美国国家科学基金会;

关键词：

Tris(pyrazolyl)hydroborato; Tris(2-pyridylthio)methyl; Lithium; Trigonal pyramidal; Trigonal monopyramidal; LIGAND-EXCHANGE PROCESSES; EFFECTIVE CORE POTENTIALS; X-RAY STRUCTURES; AB-INITIO; MOLECULAR CALCULATIONS; MAGNETIC-RESONANCE; SYNTHETIC ANALOGS; CHEMICAL-SHIFTS; TRIS(PYRAZOLYL)BORATE LIGANDS; COPPER(I) COMPLEXES;

D O I：

10.1016/j.poly.2013.02.008

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

X-ray diffraction reveals that the molecular structures of the tris(pyrazolyl)hydroborato and tris(2-pyridylthio)methyl lithium compounds, [Tp(But,R)]Li (R = H, Me) and [kappa(4)-Tptm]Li, respectively exhibit three-coordinate trigonal pyramidal and four-coordinate trigonal monopyramidal coordination geometries, both of which are uncommon for lithium. Accordingly, [Tp(But)]Li and [Tp(But,Me)]Li bind additional ligands to form four-coordinate adducts, such as [Tp(But)]Li(NCMe), [Tp(But,Me)]Li(NCMe), [Tp(But)]Li(pz(But)H), [Tp(But,Me)]Li(pz(But)H)center dot(pz(But)H), [Tp(But,Me)]Li(OH2), [Tp(')(But)(Me)]Li(OH2)center dot(pzH) and [Tp(But)]Li(OH2)center dot(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(But,R)]Li is facile such that the adducts exist in equilibrium with [Tp(')(But)(R)]Li and L, as demonstrated by NMR spectroscopic studies. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：235 / 246

页数：12

共 121 条

[11] DENSITY-FUNCTIONAL THERMOCHEMISTRY .3. THE ROLE OF EXACT EXCHANGE [J].