Progress of Conjugated Phenomena Coupled with Spin and Photon for Assembled Hetero-Molecular System by Using Coordination Space

利用配位空间组装异质分子体系自旋与光子耦合共轭现象研究进展

基本信息

批准号：
16074205
负责人：
KOJIMA Norimichi
金额：
$ 6.91万
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 on Priority Areas
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

项目摘要

Intercalation of photochromic molecule into magnetic system provides fascinating multi-functionalities such as photo-magnetism, which gains much attention for their application to devices. The main subjects in this project were the development of photo-induced spin-crossover phenomena at room temperature by using the photo-isomerization of intercalated molecule, and the development of the transformation of magnetism for two-dimensional ferromagnetic system coupled with photochromic molecule.The outcomes of the title subject are as follows. (1) Iron mixed-valence complex, (n-C_3H_7)_4N[Fe^<II>Fe^<III>(dto)_3] (dto = C_2O_2S_2), shows the charge transfer phase transition coupled with spin and charge around 120 K and a ferromagnetic transition at 6.5 K. These phase transitions remarkably depend on the cation size. In order to control the magnetic properties in this system by means of photo-irradiation, we have synthesized (SP) [Fe^<II>Fe^<III>(dto)_3] (SP = spiropyran), and found that the … More UV irradiation changes the structure of spiropyran from the closed form to the open one in solid state. The photochromism of spiropyran in this system controls the ferromagnetic transition temperature and the coercive field as well as the charge transfer phase transition. Moreover, we have found that the photochromism of spiropyran in (SP) [Fe^<II>Fe^<III>(dto)_3] induces the charge transfer phase transition in [Fe^<II>Fe^<III>(dto)_3]_∞. (2) We have synthesized several organic-inorganic hybrid systems consisting of two-dimensional ferromagnets and photochromic diarylethenes. In the case of layered perovskite-type copper halides coupled with cationic diarylethene, we found that the isomerization of diarylethene controls the magnetic ordering temperature. In the case of cobalt hydroxide-based 2D ferromagnet (Co-LDHs), we found that the reversible photo-isomerization of anionic diarylethene takes place in solid state and the photo-isomerization from the open form to the close form induces the enhancement of Curie temperature from 9 K to 20 K. Less

光致变色分子在磁系统中的插入提供了引人入胜的多功能性，例如照片磁磁性，它对它们在设备上的应用引起了很多关注。该项目中的主要主题是通过使用插入分子的光呈异构化以及二维铁磁系统的磁性转化的发展，与光子分子相结合的磁性转化，与光有关。（1）铁混合价络合物，（N-C_3H_7）_4n [Fe^<ii> fe^<iii>（DTO）_3]（DTO = C_2O_2S_2），显示了电荷传输相与自旋和电荷相连的电荷传输相位，并充电在6.5 K. 5 k.5 k. 5k。这些相位均匀的型号。为了通过光辐照控制该系统中的磁性，我们已经合成（SP）[Fe^<ii> fe^<iii>（dto）_3]（sp = spiritopyran），发现…更多的UV辐照将精神的结构从固体状态的封闭形式变为固体状态。该系统中精神吡喃的光色素控制铁磁过渡温度和强制场以及电荷转移相变。此外，我们发现（sp）[fe^<ii> fe^<iii>（dto）_3]中的spiritopyran的光色素诱导了电荷转移阶段转变，以[fe^<ii> fe^<iii>（dto）_3] _∞诱导。（2）我们合成了几个有机无机杂种系统，这些杂种系统由二维铁磁体和光致致射线透过甲观。对于层状钙钛矿型铜卤化物和阳离子日透利乙烯的结合，我们发现二透析乙烯的异构化控制了磁有序温度。对于基于氢氧化钴的2D Ferromagnet（Co-LDHS），我们发现阴离子日二二乙烯的可逆光相异构化以固态发生，并且从开放形式到近距离形式的光异构化诱导了从9 k到20 k的温度的增强。