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羧酸桥联的四核镧系簇合物的磁热效应和慢磁弛豫

刘遂军 ,  崔雨 ,  宋伟朝 ,  王庆伦 ,  卜显和

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引用本文: 刘遂军, 崔雨, 宋伟朝, 王庆伦, 卜显和. 羧酸桥联的四核镧系簇合物的磁热效应和慢磁弛豫[J]. 无机化学学报, 2015, 31(9): 1894-1902. doi: 10.11862/CJIC.2015.240 shu
Citation:  LIU Sui-Jun, CUI Yu, SONG Wei-Chao, WANG Qing-Lun, BU Xian-He. Carboxylate-Bridged Tetranuclear Lanthanide Clusters: Magnetocaloric Effect and Slow Magnetic Relaxation[J]. Chinese Journal of Inorganic Chemistry, 2015, 31(9): 1894-1902. doi: 10.11862/CJIC.2015.240 shu

羧酸桥联的四核镧系簇合物的磁热效应和慢磁弛豫

  • 1.

    1. 南开大学化学系, 金属与分子基材料化学天津市重点实验室, 天津化学化工协同创新中心, 天津 300071;

  • 2.

    2. 江西理工大学冶金与化学工程学院, 赣州 341000

    • 通讯作者: 卜显和,E-mail:buxh@nankai.edu.cn
  • 基金项目:

    国家自然科学基金(No.21290171) (No.21290171)

    江西省科技厅青年自然科学基金(No.20151BAB213003)资助项目。 (No.20151BAB213003)

摘要: 在水热条件下,通过使用羧酸和螯合配体得到了一个系列的四核镧系簇合物,即[Ln4(mnba)12(tzp)2(H2O)2](Ln=Gd(1),Tb(2),Er(3);Hmnba=间硝基苯甲酸;tzp=2-(1H-1,2,4-三唑-3-基)吡啶))。这3个化合物是同构的,且具有线性的四核簇结构。磁性研究表明,化合物1和3中簇内镧系离子之间是弱铁磁耦合的,但化合物2中铽离子之间是弱的反铁磁相互作用和(或)铽离子激发的斯塔克能级的去布居。化合物1具有较大的磁热效应(-ΔSmmax=20.6 J·kg-1·k-1)。交流磁化率测试表明化合物3展现出频率和温度依赖的虚部信号,这是慢磁弛豫的典型特征,原因是铒离子的强各向异性和铁磁耦合的存在。

English

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  • 收稿日期:  2015-06-08
  • 网络出版日期:  2015-07-22
通讯作者: 陈斌, bchen63@163.com
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