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Origin of the X-Hal (Hal = Cl, Br) bond-length change in the halogen-bonded complexes

机译:卤素键配合物中X-Hal(Hal = Cl,Br)键长变化的起源

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The origin of the X-Hal bond-length change in the halogen bond of the X-Hal...Y type has been investigated at the MP2(full)/6-311++G(d,p) level of theory using a natural bond orbital analysis, atoms in molecules procedure, and electrostatic potential fitting methods. Our results have clearly shown that various theories explaining the nature of the hydrogen bond cannot be applied to explain the origin of the X-Hal bond-length change in the halogen bond. We provide a new explanation for this change. The elongation of the X-Hal bond length is caused by the electron-density transfer to the X-Hal sigma* antibonding orbital. For the blue-shifting halogen bond, the electron-density transfer to the X-Hal pi* antibonding orbital is only of minor importance; it is the electrostatic attractive interaction that causes the X-Hal bond contraction.
机译:X-Hal ... Y型卤素键中X-Hal键长度变化的起源已在理论上使用MP2(full)/ 6-311 ++ G(d,p)的水平进行了研究自然键轨道分析,分子中原子的程序以及静电势拟合方法。我们的结果清楚地表明,解释氢键性质的各种理论不能用于解释卤素键中X-Hal键长度变化的起源。我们对此更改提供了新的解释。 X-Hal键长的延长是由于电子密度转移到X-Hal sigma *反键轨道而引起的。对于蓝移卤素键,电子密度转移至X-Hal pi *反键轨道的重要性不大。引起X-Hal键收缩的是静电吸引相互作用。

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