Development of Superconducting Ferromagnet Based on New Verdazyl Radical Complex

基于新型Verdazyl自由基配合物的超导铁磁体的研制

• 批准号: 15550123
• 负责人: MUKAI Kazuo
• 金额: $ 2.24万
• 依托单位: Ehime University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 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-15550123/
• 关键词: Ferromagnetism; Superconductivity; Semiconductor; Verdazyl Radical; Ni(dmit)_2; TCNQ; Spin-Peierls Transition; Heat Capacity Measurement

The development of organic ferromagnet and superconductor has attracted much attention in the field of material science, and many studies have been performed with great success in recent years. On the other hand, the examples of magnetic superconductors, where the superconducting state and antiferromagnetic or ferromagnetic order coexist in a system are very limited, because of the difficulty in molecular design of the complexes. Especially, the examples of the magnetic superconductor consisting of purely organic compounds have not been reported.In the present work, in order to obtain the organic magnetic conductors, first, we prepared several kinds of iodide salts of verdazyl radical cations (for example, 3-(4- and 3-methylpyridinium)-1,5-diphenylverdazyl radical cations ([p-MePyDV]^+ and [m-MePyDV]^+). These iodide salts were reacted with Li^+[TCNQ]^-, Li^+[Me_2-TCNQ]^-, and [n-Bu_4N]^+[Ni(dmit)_2]^- salts, giving the (1:1) salts of verdazyl cations with TCNQ, Me_2-TCNQ, and Ni(dmit)_2 anions. Several kinds of (1:2) and (1:3) salts of verdazyl cations with TCNQ, Me_2-TCNQ, and Ni(dmit)_2 anions were prepared by the oxidation of the (1:1) salts. Further, the magnetic and electric properties, and crystal structures of these radical salts have been studied. It has been clarified that the eight kinds of salts are new molecular magnetic semiconductors.

有机铁磁体和有机超导体的发展引起了材料科学领域的广泛关注，近年来开展了许多研究并取得了巨大的成功。另一方面，磁性超导体的例子，其中超导态和反铁磁或铁磁秩序共存于一个系统是非常有限的，因为在分子设计的复杂性。在本工作中，为了获得有机磁导体，首先，我们制备了几种Verdazyl自由基阳离子的碘化物盐（例如，3-（4-和3-甲基吡啶鎓）-1，5-二苯基Verdazyl自由基阳离子（[p-MePyDV]^+和[m-MePyDV]^+））。这些碘化物盐与Li^+[TCNQ]^-、Li^+[Me_2-TCNQ]^-和[n-Bu_4 N]^+[Ni（dmit）_2]^-盐反应，得到了Verdazyl阳离子与TCNQ、Me_2-TCNQ和Ni（dmit）_2阴离子的（1：1）盐。通过氧化Verdazyl阳离子与TCNQ、Me_2-TCNQ和Ni（dmit）_2的（1：1）盐，制备了几种Verdazyl阳离子与TCNQ、Me_2-TCNQ和Ni（dmit）_2阴离子的（1：2）和（1：3）盐。此外，这些自由基盐的磁性和电学性质，和晶体结构进行了研究。阐明了这八种盐是新的分子磁性半导体。

项目成果

Verdazyl-based Magnetic Systems, Carbon-Based Magnetism

Verdazyl 基磁性系统、碳基磁性

• 发表时间: 2005
• 作者: K.Mukai;S.Mitani;K.Ohara;S.Nagaoka;Y.Teki;K.Mukai;K.Mukai;K.Mukai
• 通讯作者: K.Mukai

Structure-activity relationship of the tocopherol-regeneration reaction by catechins

• DOI: 10.1016/j.freeradbiomed.2005.01.011
• 发表时间: 2005-05-01
• 期刊: FREE RADICAL BIOLOGY AND MEDICINE
• 影响因子: 7.4
• 作者: Mukai, K;Mitani, S;Nagaoka, SI
• 通讯作者: Nagaoka, SI

Molecular paramagnetic semiconductor: crystal structures and magnetic and conducting properties of the Ni(dmit)(2) salts of 6-oxoverdazyl radical cations (dmit = 1,3-dithiol-2-thione-4,5-dithiolate).

• DOI: 10.1021/ic030068q
• 发表时间: 2004-01
• 期刊: Inorganic chemistry
• 影响因子: 4.6
• 作者: Kyohei Mukai;N. Senba;T. Hatanaka;H. Minakuchi;K. Ohara;M. Taniguchi;Y. Misaki;Y. Hosokoshi;K. Inoue;N. Azuma

K.Mukai: "Heat Capacity Study of the Doping Effect of Paramagnetic Radicals on the Organic Spin-Peierls System (p-CyDOV Radical Crystal)"J.Phys.Soc.Jpn.. 72. 2312-2316 (2003)

K.Mukai：“顺磁性自由基对有机自旋-Peierls系统（p-CyDOV自由基晶体）的掺杂效应的热容量研究”J.Phys.Soc.Jpn.. 72. 2312-2316 (2003)

Verdazyl-based Magnetic Systems

基于 Verdazyl 的磁性系统

• 发表时间: 2005
• 期刊: Carbon Based Magnetism (Eds.T.Makarova and F.Palacio)(Elsevier B.V.) (in the press)
• 作者: A.Okazawa;T.Ishida;T.Nogami;K.Mukai
• 通讯作者: K.Mukai