Physical and chemical properties of 1B metal atoms in condensed matter

凝聚态物质中1B金属原子的物理和化学性质

基本信息

批准号：
13650885
负责人：
MIYATAKE Yoko
金额：
$ 1.6万
依托单位：
OSAKA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

Magnetic and optical properties of 1B metals produced radiation-chemically by reducing their mono cations in condensed matters have been investigated as a fundamental research to elucidate the function and effects of metal ions and/or metal atoms in biological systems.Au^0 was produced at 77 K by γ-irradiation of MTHF solutions containing Au^+. The absorption bands at around 270-280 nm and 340 nm were ascribed to Au^0 in the solid solutions. The weak absorption band at around 420 nm was also attributed to Au^0. These bands were red-shifted and broadened compared to those in the rare gas matrixes, indicating a strong solvent-Au^0 interaction. Excitation of the absorption bands with light of wavelengths of 280 nm led to phosphorescence of three kinds of lifetimes. One of them with lifetime of about 625 ms was attributed to type of exciplex as (Au^+・Ln)^*. As for other two oomponents with lifetime of about 146 and 461 ms, it became clear from the behavior of the time dependence profile of … More the phosphorescence intensity that the latter grew as the former decayed. These were ascribed to such types of exciplex as (Au^0・Ln …Au^+)^* and (Au^+…Ln・Au^0)^*, respectively. The absorption band, which was ascribed to a photoionization of Au^0, must be around at 280 nm. The fluorescence band observed at 385 nm and a set of bands at 480, 520 and 580 nm bear close resemblance to the E_1 and E_2 bands of Ag^0, respectively. The former was attributed to the exciplex (Au^0・Ln …Au^+)^* that was not paramagnetic species. The latter was attributed to the exciplex (Au^0・Ln)^*. A group of the emission bands with peaks at 456, 482, 484 and 520 nm which had the characteristic structure of the minor image relations with the absorption bands of Au^0, in the gas phase and the solid rare gas phase. This structural profile was observed for the first time in the present study for Au^0 produced in γ-irradiated organic solid solutions at 77 K. These were attributed to Au^0 trapped in a large cavity where Au^0 in its excited state interacts very weakly with the surrounding solvent molecules. Less

通过还原凝聚态物质中的单阳离子以辐射化学方式产生的 1B 金属的磁性和光学性质已作为一项基础研究进行了研究，以阐明生物系统中金属离子和/或金属原子的功能和影响。Au^0 产生于77 K，对含有 Au^+ 的 MTHF 溶液进行 γ 照射，在 270-280 nm 和 340 nm 附近的吸收带归因于固溶体中的 Au^0。 420 nm 附近的弱吸收带也归因于 Au^0，与稀有气体基质中的吸收带相比，这些带发生红移并变宽，表明吸收带与光存在强烈的激发。 280 nm 波长导致三种寿命的磷光，其中一种寿命约为 625 ms，归因于激基复合物类型为 (Au^+·Ln)^*。寿命约为 146 毫秒和 461 毫秒的组件，从磷光强度的时间依赖性行为可以清楚地看出，后者随着前者的衰减而增加，这些归因于 (Au^0· 等类型的激基复合物。 Ln …Au^+)^* 和 (Au^+…Ln・Au^0)^* 分别归因于 Au^0 的光电离，其吸收带必须位于大约280 nm处观察到的荧光带以及480、520和580 nm处的一组带分别与Ag^0的E_1和E_2带非常相似，前者归因于激基复合物（Au^0·）。 Ln …Au^+)^* 不是顺磁性物质，后者归因于发射的激基复合物 (Au^0・Ln)^*。在气相和固体稀有气体相中，峰位于456、482、484和520 nm处的谱带与Au^0的吸收谱带具有镜象关系的特征结构。目前研究中在 77 K 下 γ 辐照的有机固溶体中产生的 Au^0 的时间。这些归因于 Au^0 被困在一个大空腔中，其中激发态的 Au^0 与周围溶剂的相互作用非常弱分子少