A Polar Copper-Boron One-Electron σ-Bond
A Polar Copper-Boron One-Electron σ-Bond
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DOI：
10.1021/ja4006578
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发表时间：
2013-03-13
影响因子：
15
通讯作者：
Peters, Jonas C.
中科院分区：
文献类型：
--
作者：
Moret, Marc-Etienne;Zhang, Limei;Peters, Jonas C.
事实上，所有的化学键都是由两个原子共享的一对或几对电子组成的。由单个电子离域在两个相邻原子上形成的σ键的例子直到最近才在气相阳离子如H-2（+）和Li-2（+）以及在固体基质中产生的高度不稳定物质中发现。直到过去十年，人们才在流体溶液中观察到真正的单电子键合。在这里，我们报告的隔离和结构表征的热稳定的化合物具有铜-B单电子键，以及其氧化（非键合）和还原（两个电子键合）同系物。这个三元组提供了一个很好的机会，研究的程度，σ键合的金属杂环戊烷作为电子计数的函数。
Virtually all chemical bonds consist of one or several pairs of electrons shared by two atoms. Examples of sigma-bonds made of a single electron delocalized over two neighboring atoms were until recently found only in gas-phase cations such as H-2(+) and Li-2(+) and in highly unstable species generated in solid matrices. Only in the past decade was bona fide one-electron bonding observed for molecules in fluid solution. Here we report the isolation and structural characterization of a thermally stable compound featuring a Cu-B one-electron bond, as well as its oxidized (nonbonded) and reduced (two-electrons-bonded) congeners. This triad provides an excellent opportunity to study the degree of sigma-bonding in a metalloboratrane as a function of electron count.