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首页> 外文期刊>RSC Advances >Slow magnetic relaxation of a three-dimensional metal-organic framework featuring a unique dysprosium(III) oxalate layer
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Slow magnetic relaxation of a three-dimensional metal-organic framework featuring a unique dysprosium(III) oxalate layer

机译：具有独特的镝（III）草酸层的三维金属 - 有机框架的缓慢磁性松弛

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摘要

A novel lanthanide metal-organic framework was yielded by a hydrothermal reaction of 5-chloro-6-hydroxypyridine-3-carboxylic acid (5-Cl-6-HOPy-3-CO2H) and Dy2O3 in the presence of oxalic acid [H-2(OX)], namely, {[Dy-2(1H-5-Cl-6-Opy-3-CO2)(2)(OX)(2)(H2O)]center dot 2H(2)O}(infinity) (1, 1H-5-Cl-6-Opy-3-CO2- = 1-hydro-5-chloro-6-oxopyridine-3-carboxylate, which was formed by the autoisomerization of single deprotonated 1H-5-Cl-6-HOpy-3-CO2- anion). The dysprosium(III) ions are bridged by oxalate anions to construct an interesting 4-connected layer network with a Schalfli topology symbol of (3(2).5(2)) (3.5(3)), such layers are connected with each other by the 1H-5-Cl-6-HOpy-3-CO2- anions to form a threedimensional framework. Magnetic investigations indicated that 1 is a field-induced single-molecule magnet, displaying two-step thermal magnetic relaxation, with an effective thermal barrier of 37.6 K. Surprisingly, a zigzag chain-like gadolinium(III) complex, {[Gd(1H-5-Cl-6-Opy-3-CO2)(2)(OX)(0.5)(H2O)(3)]center dot 6H(2)O}(infinity) (2), was isolated using Gd2O3 instead of Dy2O3 owing to the lanthanide contraction effect. Notebaly, a unique F-shaped (H2O)(6) supramolecular aggregate exists in the crystal structure of 2.
机译：在草酸存在下，通过5-氯-6-羟基吡啶-3-羧酸（5-Cl-6-6-Hopy-3-Co 2H）和Dy2O3的水热反应产生新的镧系金属 - 有机骨架[H- 2（牛）]，即（1H-5-C1-6- OPY-3-CO2）（2）（2）（2）（2）（H2O）]中心点2H（2）O}（无穷大）（1,1H-5-C1-6- OPY-3-CO2- = 1-氢-5-氯-6-氧化吡啶-3-羧酸盐，其通过单一反驳1H-5-CL的自体化形成-6-hopy-3-co2-阴离子）。镝（III）离子通过草酸根部桥接，以构建具有（3（2）.5（2））（3.5（3））的Schalfli拓扑符号的有趣的4连接层网络（3（3）），这些层与每个相连其他由1H-5-CL-6-HOPY-3-CO2-阴离子形成三维框架。磁性研究表明，1是现场诱导的单分子磁体，显示两步热磁性松弛，其有效的热屏障为37.6k。令人惊讶的是，Z字形链状钆（III）复合物，{[Gd（1H -5-Cl-6- Opy-3-CO 2）（2）（OX）（0.5）（H 2 O）（3）]中央点6h（2）o}（Infinity）（2）使用Gd2O3而不是由于镧系元素收缩效应，DY2O3。注意到，晶体结构的晶体结构中存在独特的F形（H2O）（6）超分子骨料。

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  • 来源
    《RSC Advances》 |2015年第78期|共7页
  • 作者

    Liu Cai-Ming; Zhang De-Qing; Zhu Dao-Ben;

  • 作者单位

    Chinese Acad Sci Inst Chem Key Lab Organ Solids Beijing Natl Lab Mol Sci Ctr Mol Sci Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Chem Key Lab Organ Solids Beijing Natl Lab Mol Sci Ctr Mol Sci Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Chem Key Lab Organ Solids Beijing Natl Lab Mol Sci Ctr Mol Sci Beijing 100190 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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