2003 Fiscal Year Final Research Report Summary
An infrared spectroscopic study on CH/π Ieractions in molecular clusters
| Project/Area Number |
14540462
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | Tohoku university |
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Principal Investigator |
FUJII Asuka Tohoku university, Graduate School of Science, Research Associate, 大学院・理学研究科, 助手 (50218963)
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| Project Period (FY) |
2002 – 2003
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| Keywords | CH / π interaction / infrared spectroscopy / cluster / intermolecular interaction / hydrogen bond / dispersion force / acetylene / benzene |
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| Research Abstract |
CH stretching vibrations of jet-cooled benzene-acetylene and several aromatics-acetylene clusters were observed for the characterization of the intermolecular interaction, so-called activated CH/π interaction between the acidic CH group and π-electrons, under the well-defined condition. The infrared-ultraviolet double resonance spectroscopic techniques were used to measure Infrared spectra of the jet-cooled clusters. The antisymmetric CH stretching vibration of the acetylene moiety exhibits substantial low-frequency shifts upon the cluster formation with the aromatic molecules, indicating such cluster structures that acetylenic CH Is bound to the π-electrons of the aromatic ring. The magnitude of the low-frequency shifts Increased with increase of the π-electron density of the ring, as expected for an ordinary π-hydrogen bond. On the other hand, the polarizability of the proton accepting molecules showed a weakly negative correlation with the CN frequency shifts.
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Research Products
(12 results)
