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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Potassium and lithium pyrazolates: The interplay of electronic and steric factors on the hapticity of the pyrazolate ligand and the influence of Lewis bases on nuclearity
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Potassium and lithium pyrazolates: The interplay of electronic and steric factors on the hapticity of the pyrazolate ligand and the influence of Lewis bases on nuclearity

机译：吡唑醇钾和吡咯烷酸锂：电子和空间因素对吡唑酸酯配体触觉的影响以及路易斯碱对核的影响

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摘要

The oligomeric potassium complex [(Me(2)pzH)(Me(2)pz)(2)(18-crown-6)(THF)K-2](2) (1) and the lithium dimer [((t)Bu(2)pz)(THF)Li](2) (2) were synthesized. Both complexes were fully characterized by spectroscopic methods and single crystal X-ray diffraction. Complex 1 crystallized in the triclinic space group P (1) over bar, the structure shows an oligomer capped with 18-crown-6 and THF in both ends. This oligomer may be thought as the result of exscind an infinite single ladder structure in which eta(2)-coordinated pyrazolate ligands to potassium ions are the steps of the stair. and the crown ether acting as a scissor. The potassium ions that form the truncated stair are coordinated in a eta(5)-fashion to one pyrazolate ligand and in a eta(1)-fashion to one pyrazolate and one pyrazolyl ligand. respectively. The potassium ions in the cavity of the 18-crown-6 ligand complete their coordination spheres with eta(5)-coordination to one pyrazolate ligand and one THF molecule. Complex 2 is formed from the nucleophilic addition of THF to the lithium pyrazolate tetramer, [((t)Bu(2)pz)Li](4). Complex 2 crystallized in the monoclinic space group C2/c. The molecular structure shows a dieter in which the pyrazolate ligands are coordinated in a mu-eta(1):eta(1) fashion to two Li ions. These ions complete their respective coordination spheres with THF. (c) 2008 Elsevier Ltd. All rights reserved.
机译：寡聚钾络合物[（Me（2）pzH）（Me（2）pz）（2）（18-crown-6）（THF）K-2]（2）（1）和锂二聚体[[（t合成了）（Bu（2）pz）（THF）Li]（2）（2）。两种配合物均通过光谱法和单晶X射线衍射进行了充分表征。配合物1在棒的三斜空间群P（1）中结晶，该结构显示低聚物的两端均被18-crown-6和THF封端。这种低聚物可能被认为是因为无限阶梯的结构是阶梯状的，其中eta（2）与钾离子配位的吡唑酸酯配体是阶梯。和冠醚充当剪刀。形成截短阶梯的钾离子以eta（5）方式配位至一种吡唑酸酯配体，以eta（1）方式配位方式为一种吡唑酸酯和一种吡唑基配体。分别。 18冠6配体腔中的钾离子通过一个（5）配位完成一个配位的吡唑酸酯配体和一个THF分子的配位球。配合物2由THF亲核加成至吡唑酸锂四聚物[[（（t）Bu（2）pz）Li]（4）形成。络合物2在单斜空间群C2 / c中结晶。分子结构显示了节食剂，其中吡唑酸酯配体以mu-eta（1）：eta（1）方式与两个Li离子配位。这些离子与THF形成各自的配位球。 （c）2008 Elsevier Ltd.保留所有权利。

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