New development of the researches in the magnetic field effects on chemical reactions

磁场对化学反应影响研究新进展

基本信息

批准号：
12440172
负责人：
HAYASHI Hisaharu
金额：
$ 7.74万
依托单位：
RIKEN (Institute of Physical and Chemical Reserch)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12440172/
关键词：
magnetic field effect pulsed magnet radical pair lifetime escape radical yield ultra-high magnetic field effect ps-laser photolysis apparatus sextet-quartet conversion relaxation mechanism ピコ秒レーザーホトリシスラジカル対トリラジカル光還元反応

项目摘要

We have tried to find new magnetic field effects on chemical reactions, extending our studies to unexplored regions of this field. We have succeeded in finding the foliowing new effects :1.We developed a pulscd magnet, which was suitable for the measurements of chemical reactions at room temperature. Using this magnet and our ns-laser photolysis apparatus, we have frst found many new effects on radical pair lifetimes and escape radical yields for some photochemical reactions in micellar and organic solutions under ultra-high magnetic fields of 17-30T. We have interpreted the effects observed in micellar solutions under fields of 0-30 T in terms of the relaxation mechanism.2.Because the magnetic field effccts on the yields in fluid organic solutions under fields of 0-30 T could not be explained by the conventional theory, we have dcveloped a new theory with a combination of the Ag and relaxation mechanisms. Using this new theory, we could make a quantitative analysis of the effects.3.We frrst developed a ps-laser photolysis apparatus, which was suitable for the measurement of magnetic field effects on photochemical reactions of usual organic molecules. Using this apparatus and our electromagnet, we have found the effect on the triplet-singlct conversion of a radical pair generated in a fluid solution. We have interpreted this effect in terms of the Ag mechanism.4.Using our ns-laser photolysis apparatus, we have found new magnetic field effects on escaped radical yields in some photochemical reactions in fluid solutions through quartet and sextet states, The latter one is the effect for the highest spin state which has ever been studied so for. We have interpreted these effects in terms of the relaxation mechanism involving the quartet-doublet and sextet-quartet conversions.

我们试图发现对化学反应的新磁场影响，从而将研究扩展到了该场的未开发区域。我们成功地找到了叶状的新作用：1。我们开发了一种PULSCD磁铁，适用于在室温下测量化学反应的磁铁。使用该磁铁和我们的NS激光光解仪，我们的FRST发现了对激进对生命的许多新影响，并在17-30T的超高磁场下，在胶束和有机溶液中的某些光化学反应逃脱了自由基产量。我们已经解释了在0-30 t的胶束溶液中观察到的效果。2.由于传统理论无法解释磁场的磁场EFFCCT在0-30 t领域的流体有机溶液中产量的磁场EFFCCT，因此我们已经通过AG和弛豫机制结合了一种新的理论。使用这种新理论，我们可以对效应进行定量分析。3。我们FRST开发了PS-LASER光解仪，该设备适用于测量磁场对常规有机分子光化学反应的测量。使用此设备和我们的电磁体，我们发现了对流体溶液中产生的激进对的三重态 - singLCT转化的影响。 4.使用NS-LASER光解仪，我们已经在流体溶液中的某些光化学反应中通过四重奏和六态在某些光化学反应中发现了新的磁场影响，后者是有史以来研究过的最高自旋状态的效果。我们已经根据涉及四重奏 - 双圈和六分光量转换的放松机制来解释这些效果。