化学学报 ›› 2013, Vol. 71 ›› Issue (05): 755-760.DOI: 10.6023/A13010121 上一篇    下一篇

所属专题: 纪念南开大学化学学科创建100周年

研究论文

基于线性叠氮四核单元的系列二维化合物: 合成, 晶体结构及磁性

李佐习, 杨乾, 李立存, 胡同亮, 卜显和   

  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 300071
  • 投稿日期:2013-01-24 发布日期:2013-03-26
  • 通讯作者: 胡同亮,tlhu@nankai.edu.cn E-mail:tlhu@nankai.edu.cn
  • 基金资助:

    项目受国家自然科学基金(Nos. 21031002, 51073079)和天津市自然科学基金(No. 11JCYBJC04100)资助.

A Series of 2D Coordination Polymers Based on Unprecedented Linear Tetranuclear Units Bridged by the Azido Anion: Syntheses, Crystal Structures and Magnetic Properties

Li Zuoxi, Yang Qian, Li Licun, Hu Tongliang, Bu Xianhe   

  1. Department of Chemistry, and Tianjin Key Laboratory of Metal & Molecule-based Material Chemistry, Nankai University, Tianjin 300071
  • Received:2013-01-24 Published:2013-03-26
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 21031002, 51073079) and the Natural Science Fund of Tianjin, China (No. 11JCYBJC04100).

分子磁体的设计与合成一直是当今物理和化学的热门研究课题. 受分子磁体启发, 通过引入叠氮磁耦合基团以及长链棒状配体4,4'-二咪唑联苯(L), 我们构筑了三个磁性化合物[Co2(N3)4(L)2.5](1), [Ni2(N3)3(NO3)(L)2.5](2)和[Mn2(N3)4(L)2.5](3). 结构分析显示, 这是三个同构化合物, 展现了一种基于线性叠氮四核单元的二维层网络. 有意义的是, 这种线性叠氮四核单元还未曾被人报道. 磁性研究表明, 三个化合物都是铁磁耦合, 这是由于EO-叠氮所导致的. 通过拟合实验数据, 我们得到了三个化合物的磁耦合常数, 进一步验证了上面磁构相关性的讨论.

关键词: 配位聚合物, 棒状配体, 线性四核簇, 磁性

Sparked by the strategy of molecular magnets, three magnetic coordination polymers, [Co2(N3)4(L)2.5] (1), [Ni2(N3)3(NO3)(L)2.5] (2) and [Mn2(N3)4(L)2.5] (3) (L=4,4'-bis(imidazol-1-yl)biphenyl), have been synthesized by employing azide as the coupling carrier and a rod-like ligand L as the magnetic insulator. Structural analysis indicates that complexes 13 are iso-structural, and illustrate a 2D (4,4) layer based on unprecedented linear tetranuclear units bridged by the EO-azido ions. Their magnetic measurements revealed that complexes 13 all present the ferromagnetic (FM) coupling, which was due to the EO-azido linker. The corresponding exchange coupling constants have been estimated by fitting the experimental data, which confirmed the above magneto-structural correlations.

Key words: coordination polymer, rod-like ligand, linear tetranuclear cluster, magnetic property