高等学校化学学报

高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (7): 1303.

• 研究论文 • 上一篇    下一篇

价态互变Co配合物的磁性能和光诱导弛豫动力学

崔爱莉1,2, 佐滕治2   

  1. 1. 清华大学化学系, 北京 100084;
    2. 神奈川科学研究院光科学重点研究室, 神奈川 21320012
  • 收稿日期:2003-07-29 出版日期:2004-07-24 发布日期:2004-07-24
  • 通讯作者: 崔爱莉(1962出生),女,博士,副教授,从事无机化学研究.E-mail:cuial@mail.tsinghua.edu.cn E-mail:cuial@mail.tsinghua.edu.cn
  • 基金资助:

    日本学术振兴会博士后基金(JSPS)资助

Magnetic Property and Relaxation Kinetics of Light-induced Valence Tautomerism of Co Complex with a Low Valence

CUI Ai-Li1,2, SATO Osamu2   

  1. 1. Department of Chemistry, Tsinghua University, Beijing 100084, China;
    2. Special Research Laboratory for Optical Science, Kanagawa Academy of Science and Technology, KSP Bldg. East 412, 3-2-1 Sakado, Takatsu-ku, Kanagawa 213-0012, Japan
  • Received:2003-07-29 Online:2004-07-24 Published:2004-07-24

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被引次数

2

摘要： 合成一种新型具有热致和光致自旋交叉及价态互变性能的配合物Co[HN(C5H4N)2](3,5-DBSQ)2.对该配合物的热致和光致磁性变化以及光照后光诱导弛豫动力学进行了研究.自旋交叉和价态互变的相变起始温度约300K.低温下光照后,低自旋Co(Ⅲ)从配体3,5-DBCAT得到1个电子变成高自旋的Co(Ⅱ),3,5-DBCAT转化为3,5-DBSQ,分子的磁矩升高.在5～30K范围内,高自旋态的弛豫速度常数kVT与温度无关,弛豫行为表现为隧道效应;而在30～70K之间,光照射后高自旋态弛豫的活化能为252cm-1.

关键词: 光诱导, 磁性, 价态互变, 弛豫动力学

Abstract: A new compound Co[HN(C5H4N)2](3,5-DBSQ)2 with LIESST(Light-induced excited spin state trapping) and LIVT(Light-induced Valence Tautomeric) was synthesized. The magnetic property and relaxation kinetics of valence tautomerism were investigated. The starting temperature of valence tautomerism is about 300 K. After illumination with 532 nm light at 5 K, Co(Ⅱ)(low spin) obtained an electron from ligand 3,5-DBCAT and became Co(Ⅲ)(high spin) while 3,5-DBCAT changed to 3,5-DBSQ. The LIVT increased the effective magnetic moment of the complex. At the temperatures ranging from 5-30 K, the k VT values are independent of temperature, which means that the tunneling is the predominant mechanism for the relaxation behavior. At the temperatures from 30-70 K, the activation energy of relaxation after illumination is 252 cm-1. When the complex is heated after illumination, the magnetization returns to the original state before irradiation. This means the relaxation temperature, TR, is 70 K.

Key words: Light-induction, Magnetization, Valence tautomerism, Relaxation kineticst

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