Cooperativity of the Activated CH/πInteraction Probed through CH Stretching Vibrations in Phenol-(Acetylene)n(∼16 ≤ n ≤ ∼30) and (Acetylene)n+(10 ≤ n ≤ 70) Clusters

Takashi Chiba, Marusu Katada, Asuka Fujii

研究成果: Article査読

抄録

The acidity of acetylene CH is stronger than that of alkane CH, and the attractive interaction between an acetylene CH with π-electrons, which shows a clear hydrogen bond property, is called activated CH/πinteraction. In this study, cooperative enhancement of the activated CH/πinteraction has been probed through the cluster size dependence of the red shift of the acetylene CH stretching vibrational band in neutral phenol-(acetylene)n (∼16 ≤ n ≤ ∼30) and (acetylene)n+ (10 ≤ n ≤ 70). In both the clusters, the characteristic asymmetric (red-shaded) shape of the CH stretch band has been observed. This band shape means that the magnitude of the activated CH/πinteraction is enhanced by its cooperativity in the interior moiety of the cluster. The red-shifted component of the band extends with increasing cluster size, and the edge of this component seems to reach to the CH stretch band position of crystalline acetylene at the size of n = 20-30, indicating that dozens of molecules need to interact each other to maximize cooperativity in the activated CH/πinteraction of acetylene. On the other hand, the peak position of the band does not converge to that of crystalline acetylene in the observed size range. The present result suggests that the spectral convergence of acetylene clusters to the bulk may occur in the cluster size range of hundreds or larger.

本文言語English
ページ(範囲)3885-3891
ページ数7
ジャーナルJournal of Physical Chemistry A
125
18
DOI
出版ステータスPublished - 2021 5月 13

ASJC Scopus subject areas

  • 物理化学および理論化学

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「Cooperativity of the Activated CH/πInteraction Probed through CH Stretching Vibrations in Phenol-(Acetylene)n(∼16 ≤ n ≤ ∼30) and (Acetylene)n+(10 ≤ n ≤ 70) Clusters」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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