Density Functional Study of Interactions between Fluorinated Cyclohexanes and Arenes

Density Functional Study of Interactions between Fluorinated Cyclohexanes and Arenes
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氟化环己烷与芳烃相互作用的密度泛函研究

DOI:
10.1002/hlca.201400049
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发表时间:
2014
影响因子:
1.8
通讯作者:
Cormanich R
Cormanich R
中科院分区:
化学4区
文献类型:
--
作者:
Cormanich R

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在BHandH/6 - 311+G(2d,p)水平下计算了全顺式-1,2,4,5-四氟环己烷(1)、全顺式-1,2,3,4-四氟环己烷(2)及其与苯的络合物的1H-NMR化学位移。在这些模型计算中,特别是当采用标准B3 LYP/def 2-TZVP优化几何结构时,从CD 2Cl 2到(D8)甲苯溶液中观察到的某些共振的屏蔽被定性地再现。结果用分子中原子的量子理论(QTAIM)和非共价相互作用(NCI)方法解释,它们表明芳香族分子与这些分子的“正表面”强烈结合(1.6 kcal mol−1)。 新化合物全-顺-1,2,4,5-四氟-3-苯基环己烷(3)的理论水平得到了验证,其中最近开发的用于优化分子晶体的QM/MM方案提供了B3 LYP/def 2-TZVP结构与固体中观察到的结构之间的良好一致性。
1H‐NMR Chemical shifts of all‐syn‐1,2,4,5‐tetrafluorocyclohexane (1), all‐syn‐1,2,3,4‐tetrafluorocyclohexane (2), and their complexes with benzene are calculated at the BHandH/6‐311+G(2d,p) level. The observed shielding of certain resonances on going from CD2Cl2to (D8)toluene solution is qualitatively reproduced in these model calculations, in particular when standard B3LYP/def2‐TZVP optimised geometries are employed. The results are interpreted with the quantum theory of atoms in molecules (QTAIM) and non‐covalent interactions (NCI) methods, and they indicate that aromatic molecules bind strongly (1.6 kcal mol−1) to the ‘positive face’ of these molecules. The level of theory is validated for the new compound all‐syn‐1,2,4,5‐tetrafluoro‐3‐phenylcyclohexane (3), where a recently developed QM/MM protocol for optimisation of molecular crystals afforded excellent agreement between the B3LYP/def2‐TZVP structure and that observed in the solid.
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