Synthesis and Properties of a Fifteen-Coordinate Complex: The Thorium Aminodiboranate [Th(H3BNMe2BH3)4]
Synthesis and Properties of a Fifteen-Coordinate Complex: The Thorium Aminodiboranate [Th(H3BNMe2BH3)4]
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DOI：
10.1002/anie.200905797
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发表时间：
2010-01-01
影响因子：
16.6
通讯作者：
Girolami, Gregory S.
中科院分区：
文献类型：
--
作者：
Daly, Scott R.;Piccoli, Paula M. B.;Girolami, Gregory S.
配位数的概念非常有用，被广泛用于描述原子的局部化学环境。配位数最初是由Alfred Werner在1893年定义的，它与原子半径、分子和电子结构、[3]和化学反应性等许多重要性质密切相关。[4,5]对Werner最初概念的一个重要修改是认识到，对于某些配体，如乙烯，两个连接的原子共同占据一个配位位点这个修改后的定义被广泛用于描述过渡金属（d-嵌段）和内过渡金属（f-嵌段）配合物。一个有趣的问题是：最大可能的配位数是多少？这个问题最近在理论上得到了考虑，并预测15位离子pbhe152 +是一个结合种配合物四（环戊二烯基）铀[UCp4]和它的钍类似物[ThCp4]各连接20个原子，但普遍认为12的Werner配位数（π键占一个位置）更适合描述这些化合物中的金属-配体键
The concept of coordination number is extremely useful and is widely employed to describe the local chemical environments of atoms. Originally defined by Alfred Werner in 1893,[1] the coordination number is closely related to many other important properties such as atomic radius,[2] molecular and electronic structure,[3] and chemical reactivity.[4, 5] An important modification of Werner s original concept was the recognition that, for certain ligands such as ethylene, two linked atoms jointly occupy a single coordination site.[6] This modified definition is widely used to describe both transitionmetal (d-block) and inner-transition-metal (f-block) complexes.[7]An interesting question is: what is the largest possible coordination number?[8] This question has recently been considered theoretically, and the 15-coordinate ion PbHe15 2+ has been predicted to be a bound species.[9] The complexes tetrakis (cyclopentadienyl) uranium [UCp4] and its thorium analogue [ThCp4] are each connected to 20 atoms,[10] but the Werner coordination number of 12 (counting π bonds as occupying one site) is widely acknowledged to be more appropriate to describe the metal–ligand bonding in these compounds.[11]