Infrared-based and Raman-based Observation of Molecular Vibrations towards Physicochemical Analysis of Ionic Liquids

基于红外和拉曼的分子振动观察对离子液体的物理化学分析

• 批准号: 14340190
• 负责人: ONISHI Hiroshi
• 金额: $ 6.53万
• 依托单位: Kanagawa Academy of Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14340190/
• 关键词: Ionic liquids; Solvents; Green chemistry; Sum-frequency spectroscopy; Fourth-order Raman spectroscopy; Interface; Molecular Structure; Time-domain spectroscopy; 赤外分光; 液体表面

Two non-linear, time-domain Raman methods have been developed towards physicochemical analysis of ionic liquids.(1)Interface-specific observation of molecular vibrations was achieved with visible light by a fourth-order optical process. An aqueous solution of oxazine dye interfaced with air was irradiated with 16-fs pluses at 600 nm. A pump pulse excited Raman-active nuclear motions of the dye. A probe pulse interacted with the excited molecules to generate second harmonic light, the intensity of which was oscillated as a function of the pump-probe delay. Fourier-transformation of the oscillation provided a vibrational spectrum of 0 - 1000 cm^<-1> for the dye located at the air-solution interface.(2)Femtosecond time-resolved photoinduced reflectivity change was measured for the first time on a spincoated dye (cresyl violet) of submonolayer coverage on a fused silica substrate. We found that the sensitivity of the reflection measurement was much higher than that of the absorption measurement for thin monolayers of dye. A prominent beating structure due to vibrational coherence of the dye was observed on the time-resolved reflection signal. A vibrational spectrum of the dye at submonolayer coverage, which corresponded its resonance Raman spectrum, was obtained in the range of 0-800 cm^<-1> by a Fourier transform analysis of the reflection signal.

已经开发了两种非线性时域拉曼方法，用于对离子液体的物理化学分析。（1）通过四阶光学过程，通过可见光实现了分子振动的界面特异性观察。与空气相连的阿恶嗪染料的水溶液用在600 nm处的16-Fs柱子照射。泵脉冲激发了染料的拉曼活性核运动。探针脉冲与激发分子相互作用以产生第二个谐波光，其强度是振荡的，这是泵探针延迟的函数。振荡的傅立叶转换提供了位于空气溶液接口处的染料0-1000 cm^<-1>的振动光谱。（2）首次在胶粘剂（Cresyl vilet）上，首次测量了飞秒时时间分辨出的光子分解的光诱导的反射率变化，该反射率是第一次测量的（Cresyl vilet）。我们发现，反射测量的灵敏度远高于染料薄单层的吸收测量值的敏感性。在时间分辨反射信号上观察到由于染料的振动连贯性而引起的突出的跳动结构。通过对反射信号的傅立叶变换分析，在0-800 cm^<-1>的范围内获得了子单层覆盖率的染料的振动光谱。

项目成果

Takeshita, Sasaki, Kobashi, Tanaka, Maeda, Yamakata, Ishibashi, Onishi: "Photophysics and Electron Dynamics in Dye-sensitized Semiconductor Film Studied by Time-resolved Mid-IR Spectroscopy"Journal of Physical Chemistry B. 107(In press). (2003)

Takeshita、Sasaki、Kobashi、Tanaka、Maeda、Yamakata、Ishibashi、Onishi：“通过时间分辨中红外光谱研究的染料敏化半导体薄膜中的光物理学和电子动力学”物理化学杂志 B.107（出版中）。

A multiplex infrared-visible sum-frequency spectrometer with wavelength tunability of the visible probe

可见光探头波长可调的复合红外-可见光和频光谱仪

• 发表时间: 2002
• 期刊: Applied Physics Letters 81
• 作者: Taka-aki Ishibashi;Hiroshi Onishi
• 通讯作者: Hiroshi Onishi

山方啓, 石橋孝章, 大西洋: "時間分解赤外分光でみた二酸化チタン微粒子から吸着分子への電荷移動"表面科学. 24. 46-52 (2003)

Kei Yamakata、Takaaki Ishibashi，Atlantic：“通过时间分辨红外光谱观察到从二氧化钛细颗粒到吸附分子的电荷转移”表面科学 24. 46-52 (2003)。

Molecular conformation of n-alkyl monolayers covalently bonded to Si(111) probed by infrared-visible sum-frequency spectroscopy

红外-可见和频谱探测与 Si(111) 共价键合的正烷基单分子层的分子构象

• 发表时间: 2002
• 期刊: Chemical Physics Letters 367
• 作者: Taka-aki Ishibashi;Masato Ara;Hirokazu Tada;Hiroshi Onishi
• 通讯作者: Hiroshi Onishi

石橋孝章, 大西 洋: "可視プローブ波長可変性を持つマルチプレックス赤外可視和周波発生分光装置の開発"表面科学. 23. 468-474 (2002)

Takaaki Ishibashi、Hiroshi Onishi：“具有可见光探头波长可调性的多重红外-可见光和频发生光谱仪的开发”表面科学 23. 468-474 (2002)。