Development of Multi-functional Magnets Based on Supramolecular Architecture

基于超分子结构的多功能磁体的研制

• 批准号: 16550121
• 负责人: ISHIDA Takayuki
• 金额: $ 2.37万
• 依托单位: The University of Electro-Communications
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16550121/
• 关键词: Molecule-based magnets; Metal-assembled complex; Supramolecular chemistry; Porous materials; Single-molecule magnets; Host-guest complex; Weak ferromagnet

Supramolecular techniques have been used to tune molecule-based magnetic materials. We have developed nano-porous magnetic materials, whose magnetic properties were changed by inclusion of small diamagnetic molecules. Switchable magnets by means of host-guest chemistry have been investigated.Host-guest complexes of tri- and tetra-radical-substituted azamacrocycles afforded the folded structures of the hosts where the radical oxygen atoms were coordinated to the guest metal ion, leading to enhanced antiferromagnetic couplings in the solid state and an ESR line broadening in the solution phase.We also prepared metal-radical hybrid magnets using bridging ligands as supramolecular synthons. Novel paramagnetic chelating ligands (pzNN, pzIN, pzbisNN, pzbislN, 6bpyNO, and 2pyNO) were developed and applied to the synthesis of mono-, di-, tri-, and polynuclear complexes (NN, IN, and NO stand for organic free radical groups). We have exploited potential utility of the bridging paramagnetic ligands (HIN, HNN, CnPNN). A strong character of a single-chain magnet (SCM) is operative in the magnetically ordered state in the one-dimensional Co-C4PNN complex, giving a largest class of the coercive field (52 kOe (4.1 MA m^-1) at 6 K).Several oligonuclear 3d-4f heterometallic complexes have been characterized as ground ferrimagnetic high-spin molecules. Lanthanide ions are supposed to be promising candidates for the elements of single-molecule magnets (SMMs) because of the large magnetic momentum and anisotropy.We have established the [Dy_2Cu], [Dy_4Cu], and [Dy_2,Cu_2] complexes as new SMMs and [Dy_2,Cu_2,]_n, as a SCM. A plausible mechanism for quantum tunneling of magnetization has been proposed for the first time among the 3d-4f heterometallic SMMs and SCMs.

超分子技术已用于调整基于分子的磁性材料。我们开发了纳米孔磁性材料，其磁性特性通过包含小的磁性分子而改变。 Switchable magnets by means of host-guest chemistry have been investigated.Host-guest complexes of tri- and tetra-radical-substituted azamacrocycles afforded the folded structures of the hosts where the radical oxygen atoms were coordinated to the guest metal ion, leading to enhanced antiferromagnetic couplings in the solid state and an ESR line broadening in the solution phase.We also prepared metal-radical使用桥接配体作为超分子合成子的杂种磁铁。开发并应用了新型的顺磁性螯合配体（Pznn，Pznn，Pzbisnn，Pzbisln，6bpyno和2pyno），并应用于单，DII，TRI-和多核复合物（NN，NN，NN，IN，且无需有机自由基组）的合成。我们利用了桥接顺磁配体的潜在效用（Hin，Hnn，CNPNN）。单链磁铁（SCM）的一个强特性在一维的Co-C4PNN复合体中具有磁有序状态，从而给出了最大的强制田（52个KOE（4.1 mA m^-1），在6 k）处。处于近距离3d-4f寡核的寡核近似近距离构型摩尔氏菌的地位较高属于Ferrimagniimagn frerrimagniimagniimagn。由于磁性动量和各向异性较大，因此应该成为单分子磁铁（SMM）元素的有前途的候选者。我们已经确立了[dy_2cu]，[dy_4cu]和[dy_4cu]和[dy_2，cu_2]，因为new smms and new smms and [dy_2，dy_2，dy_2，cu_2，cu_2 ,, n n n n n n n new Smms and]在3D-4F杂质SMM和SCM中，首次提出了一种用于磁化量子化的合理机制。

项目成果

Multifunctional Conducting Molecular Materials (RSC publishing, U.K.)

多功能导电分子材料（RSC 出版，英国）

• 发表时间: 2007
• 作者: S.Ueki;T.Ishida;T.Nogami;K.-Y.Choi;H.Nojiri;M.Suzuki 他4名
• 通讯作者: M.Suzuki 他4名

Magnetic Properties of Transition Metal Complexs with 2,2'-Bipyridin-5-ylt-Butyl Nitroxide

2,2-联吡啶-5-基丁基氮氧化物过渡金属配合物的磁性

• 发表时间: 2005
• 期刊: Polyhedron (印刷中)
• 作者: A.Matsuo;K.Hosokawa;Y.Narumi;K.Okunishi;N.Maeshima;T.Asano;Y.Ajiro;T.Ishida;T.Nogami;K.Kindo;T.Ishida 他3名;T.Shimada 他3名;F.Mori 他2名;K.Yuza 他2名;T.Ishida 他2名;A.Matsuo 他9名;T.Ishida 他3名;T.Shimad 他3名
• 通讯作者: T.Shimad 他3名

Weak ferromagnetism with very large canting in a chiral lattice : (pyrimidine)_2FeCl_2

手性晶格中具有非常大倾斜的弱铁磁性：(pyrimidine)_2FeCl_2

• 发表时间: 2004
• 期刊: Physical Review B 69
• 作者: A.Matsuo;K.Hosokawa;Y.Narumi;K.Okunishi;N.Maeshima;T.Asano;Y.Ajiro;T.Ishida;T.Nogami;K.Kindo;T.Ishida 他3名;T.Shimada 他3名;F.Mori 他2名;K.Yuza 他2名;T.Ishida 他2名;A.Matsuo 他9名;T.Ishida 他3名;T.Shimad 他3名;F.Mori 他2名;A.Okazawa 他2名;R.Feyerherm 他9名
• 通讯作者: R.Feyerherm 他9名

Remarkably Strong Intermolecular Antiferromagnetic Couplings in the Crystal of Biphenyl-3,5-diyl Bis(tert-butyl Nitroxide)

联苯-3,5-二基双(叔丁基氮氧化物)晶体中非常强的分子间反铁磁耦合

• 发表时间: 2004
• 期刊: Chemical Physics Letters 392
• 作者: G>Kurokawa;他2名
• 通讯作者: 他2名

Structures and Magnetic Properties of Copper(II) Complexes Containing Tetrakis(2-pyridyl)methane

四(2-吡啶基)甲烷铜(II)配合物的结构和磁性

• 发表时间: 2005
• 期刊: Polyhedron (印刷中)
• 作者: A.Okazawa;他2名
• 通讯作者: 他2名