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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Interaction of Aromatic Compounds with Xenon: Spectroscopic and Computational Characterization for the Cases of p-Cresol and Toluene
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Interaction of Aromatic Compounds with Xenon: Spectroscopic and Computational Characterization for the Cases of p-Cresol and Toluene

机译:芳香族化合物与氙的相互作用:对甲酚和甲苯的光谱分析和计算表征

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We have investigated noncovalent interactions of two aromatic compounds (toluene and p-cresol) with Xe atoms by using infrared spectroscopy in a Ne matrix and quantum chemical calculations. The present results show that the methyl group of these molecules is a sensitive probe of the interaction with Xe. We have used the molecules with the deuterated methyl group, possessing a relatively simple spectrum; which allows us to detect characteristic vibrational shifts in the complexes, in which a Xe atOm interacts with the aromatic pi electron system (pi structure). For the p-cresol center dot center dot center dot Xe complex, we also observed evidence of the 1:1 H-bonded structure: The amount of the H-bonded structure of the cresol Xe complex is relatively small; which agrees with the calculated interaction energies (stronger interaction for the pi structure). The bands of the 1:1 complexes of p-cresol and toluene with Xe appear at low Xe concentration and their intensities relative to the monomer bands are nearly proportional to the Xe/Ne concentration ratio. For the p-cresol Xe system, additional OH stretching bands appear at higher Xe concentrations, which are suitable for the complexes with several Xe atoms. The pi structures studied in this work can probably be formed in the aromatic amino acids, for which these simple aromatic compounds are useful models. Case of
机译:我们通过在Ne矩阵中使用红外光谱和量子化学计算,研究了两种芳香族化合物(甲苯和对甲酚)与Xe原子的非共价相互作用。目前的结果表明,这些分子的甲基是与Xe相互作用的灵敏探针。我们已经使用了具有氘代甲基的分子,它们具有相对简单的光谱。这使我们能够检测配合物中的典型振动位移,其中Xe atOm与芳族π电子系统(pi结构)相互作用。对于对甲酚中心点中心点中心点Xe配合物,我们还观察到了1:1 H键合结构的证据:甲酚Xe配合物的H键合结构的量相对较小;这与计算出的相互作用能一致(π结构的相互作用更强)。对甲苯酚和甲苯与Xe的1:1配合物的谱带出现在低Xe浓度下,它们相对于单体谱带的强度几乎与Xe / Ne浓度比成正比。对于对甲酚Xe系统,在更高的Xe浓度下会出现额外的OH拉伸带,适用于具有多个Xe原子的配合物。在这项工作中研究的pi结构可能是在芳香族氨基酸中形成的,这些简单的芳香族化合物是有用的模型。情况

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