The structure of tris(chloromethyl)amine in the gas phase using quantum chemical calculations and gas electron diffraction and as a solid and melt using Raman spectroscopy

The structure of tris(chloromethyl)amine in the gas phase using quantum chemical calculations and gas electron diffraction and as a solid and melt using Raman spectroscopy
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使用量子化学计算和气体电子衍射分析气相中的三(氯甲基)胺的结构,并使用拉曼光谱分析固体和熔体的结构

DOI:
10.1007/s11224-018-1089-1
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发表时间:
2018
影响因子:
1.7
通讯作者:
Rankine C
Rankine C
中科院分区:
化学4区
文献类型:
--
作者:
Rankine C

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用电子衍射法测定了三(氯甲基)胺N(CH2Cl)3的气相平衡结构。利用半经验分子动力学(SE-MD)模拟计算了单步距离修正(表示从平衡结构到振动平均结构的原子间距离的差异)和振动幅度,以便准确地描述特别是与一个CH2Cl基团相关的低频、大振幅振动模式。一系列补充的理论计算使用SOGGA11-X DFT泛函与相关一致的基集的双重,三重,和四倍-ζ质量也提出了。实验平衡结构参数与理论平衡结构参数的一致性证明了应用理论计算和我们的气相结构解的准确性。在一定温度范围内记录了拉曼光谱,从而可以研究固体和熔体,并确定拉曼活性分子内模式。在不受分子间相互作用影响的情况下,三(氯甲基)胺在气相中的结构与文献中报道的单晶结构明显不同。讨论了这一问题,并评价了三(氯甲基)胺中头端效应的证据。
The equilibrium structure of tris(chloromethyl)amine, N(CH2Cl)3, has been determined in the gas phase using electron diffraction. Single-step distance corrections (representing the differences between the interatomic distances from the equilibrium structure and those from the vibrationally averaged structure) and amplitudes of vibration have been computed using semi-empirical molecular dynamics (SE-MD) simulations in order to treat accurately the description of the low-frequency, large-amplitude vibrational modes associated particularly with one CH2Cl group. A series of complementary theoretical calculations using the SOGGA11-X DFT functional with correlation-consistent basis sets of double-, triple-, and quadruple-ζ quality is also presented. The agreement between the experimental and theoretical equilibrium structural parameters attests to the accuracy of the applied theoretical calculations and of our gas-phase structural solution. Raman spectra have been recorded over a range of temperatures, allowing the solid and the melt to be studied, and the Raman-active intramolecular modes to be identified. Free from the influence of intermolecular interaction, the structure of tris(chloromethyl)amine in the gas phase is markedly different to that reported in the literature for the single crystal. This is discussed, and evidence for the anomeric effect in tris(chloromethyl)amine is evaluated.
气态和固态三(2,2,2-三氟乙基)胺 N(CH2CF3)3 的结构和构象
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