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Crystalline Effects on the Properties of the Dative Bond:A Computational Study of HCN-BF_3

机译:结晶对键合性质的影响:HCN-BF_3的计算研究

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The changes in molecular structure associated with the crystallization of the donor-acceptor complex HCN-BF_3 are studied using density functional theory.Short-range dipole-dipole interactions have been attributed to be one of the main causes of the 0.84 A shortening of the B-N bond in the crystal phase compared to the gas phase.Natural bond orbital analysis is used to obtain information regarding the electron distribution and possible delocalization effects.The lone pair on the fluorine atoms shows significant delocalization toward the boron-nitrogen antibonding orbital,leading to substantial structural changes occurring that can be manipulated by increasing or decreasing the degree of overlap.Because the overlap is dependent on the position of the fluorine atom,the steric and electronic influences created by the surroundings of a molecular unit in the crystal are of considerable importance when the experimentally observed changes are explained.
机译:使用密度泛函理论研究了与供体-受体复合物HCN-BF_3结晶相关的分子结构变化。近距离偶极-偶极相互作用被认为是BN缩短0.84 A的主要原因之一相比于气相,晶体相具有更大的键合度。自然键合轨道分析用于获得有关电子分布和可能的离域效应的信息。氟原子上的孤对显示出向硼-氮反键合轨道的显着离域,从而导致由于重叠取决于氟原子的位置,因此发生的结构变化可以通过增加或减少重叠程度来控制。由于重叠取决于氟原子的位置,因此当晶体中分子单元的周围环境产生的空间和电子影响非常重要。解释了实验观察到的变化。

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