首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Charge Transfer Interaction of Intermolecular Hydrogen Bonds in 7-Azaindole(MeOH)_n (n ) 1, 2) with IR-Dip Spectroscopy and Natural Bond Orbital Analysis
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Charge Transfer Interaction of Intermolecular Hydrogen Bonds in 7-Azaindole(MeOH)_n (n ) 1, 2) with IR-Dip Spectroscopy and Natural Bond Orbital Analysis

机译:IR-Dip光谱和自然键轨道分析法研究7-氮杂吲哚(MeOH)_n(n)1,2)中分子间氢键的电荷转移相互作用

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摘要

Resonance-enhanced two-photon ionization (RE2PI) spectra of the deuterated 7-azaindole [7AI](MeOH)n (n ) 1-3) clusters in the 0-0 region of the S1-S0 (ππ*) transition and IR-UV ion-dip spectra of the deuterated 7AI(MeOH)_n (n ) 1, 2) in the NH and OH stretch regions are observed in the gas phase to investigate the effect of charge transfer delocalization interaction on intermolecular hydrogen bonds. Two and three isotopomers are identified for 7AI(MeOH)_1-d_1 and 7AI(MeOH)_2-d_2, respectively, where 7AI(MeOH)_1-d_1 has a deuterium atom in the NH or OH group and 7AI(MeOH)_2-d_2 has two deuterium atoms in the NH and OH groups or in the two OH groups. The local modes of the NH and OH groups are successfully observed in the IR-dip spectra upon deuteration. The NH and OH stretch fundamentals of the 7AI(MeOH)_1-d_1 and 7AI(MeOH)_2-d_2 clusters are red-shifted from the corresponding ones of the 7AI and MeOH monomers. The observed redshifts in 7AI(MeOH)_1-d_1 and 7AI(MeOH)_2-d_2 are correlated with the second-order perturbative energies obtained by the natural bond orbital analysis, suggesting that the charge transfer delocalization interaction plays an important role in stabilizing the intermolecular hydrogen bonds in 7AI(MeOH)_n (n ) 1, 2).
机译:S1-S0(ππ*)跃迁和IR的0-0区域中的氘代7-氮杂吲哚[7AI](MeOH)n(n 1-3)簇的共振增强双光子电离(RE2PI)光谱在气相中观察到NH和OH延伸区中的氘代7AI(MeOH)_n(n 1,2,3)的-UV离子浸光谱,以研究电荷转移离域相互作用对分子间氢键的影响。分别为7AI(MeOH)_1-d_1和7AI(MeOH)_2-d_2鉴定了两种和三种异构体,其中7AI(MeOH)_1-d_1在NH或OH基团中具有氘原子,而7AI(MeOH)_2- d_2在NH和OH基团或在两个OH基团中具有两个氘原子。氘化后,在IR浸渍光谱中成功观察到NH和OH基团的局部模式。 7AI(MeOH)_1-d_1和7AI(MeOH)_2-d_2簇的NH和OH拉伸基本特征从7AI和MeOH单体中的相应单体发生了红移。观察到的7AI(MeOH)_1-d_1和7AI(MeOH)_2-d_2的红移与通过自然键轨道分析获得的二阶微扰能相关,这表明电荷转移离域相互作用在稳定分子间起着重要作用。 7AI(MeOH)_n(n)1,2)中的分子间氢键。

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