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Anomalous Magnetic Properties of Molecular Oxygen Adsorbed in Microporous Metal-Organic Solids

微孔金属有机固体中吸附分子氧的反常磁性

基本信息

批准号：
16074210
负责人：
KOBAYASHI C. Tatsuo
金额：
$ 6.14万
依托单位：
Okayama University
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

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16074210/
关键词：
microporous metal-organic molecular oxygen magnetism x-ray diffraction high magneic field 強磁場磁化過程

项目摘要

Molecular oxygen forms 02-02 dimer in the coordination space of CPL-1 [Cu2(pzdc)2(pyz)]. It is found that the arrangement of 02 is associated not only with the interaction between the guest molecules and the host compound but also with the intermolecular interaction. The ab initio calculation of 02-02 dimer has pointed out that the magnetic interaction contributes to the formation of the H-structure alignment with singlet ground state (S = 0) while the most stable alignment of the quartet state (S = 2) is known to be different. Therefore we predicted the field-induced rearrangement in condensed 02 system in general.In this project, we have investigated the relation between the arrangement and the magnetic properties of 02 adsorbed in the coordination space by means of x-ray powder diffraction and magnetic measurements. In the case of CPL-1, the magnetization process and the temperature dependence of susceptibility can be interpreted by considering the excited state with different molecular arrangements. Similar magnetic properties have been observed in 02 adsorbed in Cu-CHD [Cu-1,4-cyclohexanedicarboxylic acid]. Though the MEM/Rietvelt analysis to determine the arrangement of adsorbed 02 is now in progress, the observed magnetic properties can be explained by same model. In CPL-p1 [Cu(dhba)2(4,4' -bpy)] and CID-4 [Cd(bpndc) (bpy)], the magnetization processes of adsorbed 02 show the metamagnetic transitions which depends on the adsorption. Though the arrangement of 02 is not clear, it is clear that the coordination spaces in these compounds are larger than that of CPL-1 or Cu-CHD. It is naturally considered that the existence of a few adsorption sites causes the adsorption dependence.Up to now the direct observation of field-induced rearrangement has not been succeeded. For CPL-1, the critical field is too high to carry out the XRD experiment. For Cu-CHD with lower critical field, the observation of field-induced rearrangement by XRD measurement is expected.

分子氧在CPL-1 [Cu 2（pzdc）2（pyz）]的配位空间中形成02-02二聚体。发现O2的排列不仅与客体分子和主体化合物之间的相互作用有关，而且与分子间的相互作用有关。对02-02二聚体的从头计算表明，磁相互作用有助于形成H-结构，其基态为单重态（S = 0），而四重态（S = 2）的最稳定排列是不同的。本项目利用X射线粉末衍射和磁性测量研究了吸附在配位空间中的O2的排列与磁性之间的关系。在CPL-1的情况下，磁化过程和磁化率的温度依赖性可以通过考虑不同分子排列的激发态来解释。在Cu-CHD [Cu-1，4-环己烷二羧酸]中吸附的O2中观察到类似的磁性。虽然确定吸附O2排列的MEM/Rietpyruvone分析正在进行中，但观察到的磁性可以用相同的模型来解释。在CPL-p_1 [Cu（dhba）_2（4，4 ' -bpy）]和CID-4 [Cd（bpndc）（bpy）]中，吸附态O_2的磁化过程表现出依赖于吸附的变磁转变。尽管02的排列尚不清楚，但很明显，这些化合物中的配位空间比CPL-1或Cu-CHD的配位空间更大。很自然地认为是少量吸附位的存在导致了这种吸附依赖性，但迄今为止还没有成功地直接观察到场致重排。对于CPL-1，临界场太高而不能进行XRD实验。对于具有较低临界场的Cu-CHD，可望通过XRD测量观察到场致重排。

项目成果

期刊论文数量（42）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Magnetic properties of a one-dimensional array of oxygen in a micro-porous metal-organic solid

微孔金属有机固体中一维氧阵列的磁性

DOI：
发表时间：
2004
期刊：
J. Magn. Magn. Mater. 272-276
影响因子：
0
作者：
A. Matsuo;et al.
通讯作者：
et al.

Highly controlled acetylene accommodation in a metal-organic microporous material

DOI：
10.1038/nature03852
发表时间：
2005-07-14
期刊：
NATURE
影响因子：
64.8
作者：
Matsuda, R;Kitaura, R;Mita, Y
通讯作者：
Mita, Y

Metastable sorption state of a metal-organic porous material determined by the in-situ synchrotron powder diffraction

原位同步加速器粉末衍射测定金属有机多孔材料的亚稳态吸附状态

DOI：
发表时间：
2006
期刊：
Angew.Chem.Int.Ed. 45
影响因子：
0
作者：
Y. Kubota;et. al.;Y.Kubota et al.
通讯作者：
Y.Kubota et al.

多孔性配位高分子Cu-CHDに吸着した酸素分子の構造と磁性

多孔配位聚合物Cu-CHD吸附氧分子的结构与磁性

DOI：
发表时间：
2008
期刊：
影响因子：
0
作者：
A. Matsuo;T. C. Kobayashi;M. Suzuki;K. Kindo;R. Kitaura;R. Matsuda;H-C. Chang;S. Kitagawa;R.Kitaura et al.;R.Matsuda et al.;A.Matsuo et al.;堀彰宏
通讯作者：
堀彰宏

ミクロ孔をもつ配位高分子に吸着した酸素分子の磁性

微孔配位聚合物吸附氧分子的磁性