Development of molecular spectroscopy with the use of femtosecond light pulses in the near-infrared spectral region

利用近红外光谱区飞秒光脉冲发展分子光谱

基本信息

批准号：
15350005
负责人：
IWATA Koichi
金额：
$ 9.86万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15350005/
关键词：
femtosecond time-resolved near-infrared spectroscopy electron-transfer reaction bianthryl titanium oxide 偏光測定

项目摘要

1. Formation of charge-transfer state in bianthrylBianthryl is formed by two anthracene rings connected by a C-C bond. When this molecule absorbs a photon, an electron is migrated from one of the anthracene rings to the other. This is one of the most basic and simplest chemical reactions. By using femtosecond time-resolved near-infrared spectroscopy, the locally excited (LE) state and the charge transfer (CT) state are clearly observed as separate transitions. It has been concluded that the LE state generated by the photoirradiation of bianthryl in acetonitrile solution is directly converted to the CT state.2.Carrier dynamics in titanium oxideBecause the wavelength of the probe light is longer than visible or ultraviolet spectroscopies, it is possible to apply time-resolved near-infrared spectroscopy to scattering samples with the transmission method. By using this advantage, the head investigator and his collaborators have applied femtosecond time-resolved near-infrared spectroscopy t … More o the powder samples of titanium oxide photocatalyst (TIO4, 20 nm in diameter). They successfully observed an electron relaxation process that occurs within 1 ps, electro-hole recombination processes in several tens of picoseconds, and an electron migration process from titanium oxide to platinum co-catalyst in 2 ps. The results explain the mechanism of the increase of catalytic activities when platinum co-catalyst is loaded to titanium oxide particles.3.Nature of charge-transfer state of symmetrically and asymmetrically substituted bianthrylsTime-resolved near-infrared spectra of symmetrically and asymmetrically substituted bianthryls have been measured. CT state absorption bands in the near-infrared region were observed only for the symmetrically substituted bianthryls ; they were not observed for the asymmetrically substituted bianthryls. It is strongly suggested that the CT absorption band observed in the near-infrared region represents the charge resonance interaction between the two anthracene rings. Less

1。通过使用飞秒时间分辨的光谱法（CT）状态，电子从一个最基本和最简单的化学反应中迁移到OTER。双子乙烯在乙腈溶液中产生的LE状态直接转换为CT状态。2。氧化钛的载体动力学，因为探针的波长比可见的或紫外线镜的长度更长，可以在近距离光谱镜上施加时间 - 近近 - 近距离回旋近 - 回旋近 - 回旋近 - 回值用这种优势使用传输方法散射的红外光谱，他的合作者及其合作者施加了时间秒的时间固定在近红外的近红外。氧化物光催化剂（直径为20 nm）解释当铂Co-Co-catalyst被加载到氧化钛的电荷转移状态时，仅测量了不对称替代的beanthryls的氧化钛的机制。对称取代的双晶体是在近乎侵蚀的区域中观察到的CT吸收带。