Novel three-dimensional metal-azide network induced by a bipyridine-based zwitterionic monocarboxylate ligand: structures and magnetism.
Novel three-dimensional metal-azide network induced by a bipyridine-based zwitterionic monocarboxylate ligand: structures and magnetism.
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DOI：
10.1021/ic1011633
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发表时间：
2010-08
影响因子：
4.6
通讯作者：
Yu Ma;Xiu-bing Li;Xiu-Chun Yi;Q. Jia;E. Gao;Caiming Liu
中科院分区：
文献类型：
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作者：
Yu Ma;Xiu-bing Li;Xiu-Chun Yi;Q. Jia;E. Gao;Caiming Liu
以4，4 '-联吡啶基两性离子单羧酸配体4，4'-联吡啶-1-乙酸酯（L）为共配体，构建了具有叠氮桥和羧酸桥的新型磁性配位聚合物。[Co（2）（L）（2）（N（3））（4）（H（2）O）] x4 H（2）O（1）和[Mn（6）（L）（4）（N（3））（12）（H（2）O）] x5 H（2）O（2）进行了结构和磁性表征。化合物1由一维（1D）配位链组成，其中具有混合（mu-EO-N（3））（mu-COO）（2）（EO =末端）三桥的前所未有的双核基序通过4，4 '-联吡啶鎓-N-亚甲基间隔基交联。在化合物2中，叠氮阴离子将金属离子连接成具有前所未有的拓扑结构的非常复杂的三维（3D）网络，并且两性离子共配体嵌入3D网络中并充当3D网络的额外支撑。磁性研究表明，（mu-EO-N（3））（mu-COO）（2）混合三桥传递Co（II）化合物中的铁磁耦合，Mn（II）化合物中存在全面的反铁磁相互作用。
The 4,4'-bipyridine-based zwitterionic monocarboxylate ligand, 4,4'-dipyridinio-1-acetate (L), is used as coligand to construct novel magnetic coordination polymers with mixed azide and carboxylate bridges. Two compounds, [Co(2)(L)(2)(N(3))(4)(H(2)O)] x 4 H(2)O (1) and [Mn(6)(L)(4)(N(3))(12)(H(2)O)] x 5 H(2)O (2), have been structurally and magnetically characterized. Compound 1 consists of one-dimensional (1D) coordination chains in which the unprecedented binuclear motifs with mixed (mu-EO-N(3))(mu-COO)(2) (EO = end-on) triple bridges are cross-linked by the 4,4'-dipyridinium-N-methylene spacers. In compound 2, the azide anions link the metal ions into a very complicated three-dimensional (3D) network with unprecedented topology, and the zwitterionic coligand is embedded in and serves as additional supports for the 3D network. Magnetic studies reveal that the mixed (mu-EO-N(3))(mu-COO)(2) triple bridges transmit ferromagnetic coupling in the Co(II) compound, and the overall antiferromagnetic interactions exist in the Mn(II) compound.