Field-Induced Slow Magnetic Relaxation and Gas Adsorption Properties of a Bifunctional Cobalt(II) Compound
Field-Induced Slow Magnetic Relaxation and Gas Adsorption Properties of a Bifunctional Cobalt(II) Compound
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双功能钴(II)化合物的场致慢磁弛豫和气体吸附性能
DOI：
10.1021/acs.inorgchem.5b02324
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发表时间：
2015
影响因子：
4.6
通讯作者：
Liu Qing-Yan
中科院分区：
文献类型：
--
作者：
Wang Yu-Ling;Chen Lin;Liu Cai-Ming;Zhang Yi-Quan;Yin Shun-Gao;Liu Qing-Yan
合成了以4-（苯并咪唑-1-基）苯甲酸酯（bmzbc -）为配体的新化合物{[Co(bmzbc)2]·2DMF}n（JXNU-1， jxnu -注：江西师范大学）。Co（II）离子由棒状的bmzbc配体桥接，形成二维（2D）薄片，其中Co（II）离子在空间上被长长的bmzbc棒状体分开。2D薄片进一步堆叠成3D框架，其中1D通道遮挡来宾DMF分子。详细的磁性研究表明，单个八面体Co（II）离子injxnu -1表现出场致慢磁弛豫，这是单离子磁体（SIMs）的特征行为。Co（II）离子injxnu -1的零场分裂（ZFS）参数d很少观测到正值，这表明jxnu -1是Co（II）基SIMs的一个独特的例子，具有易于平面各向异性，这也得到了计算的证实。通过测定co2吸附等温线，确定了jxnu -1的微孔性质。c3h8和c2h6吸附等温线的突变表明在气体加载过程中发生了结构转变。injxnu -1磁性金属中心之间的长连接满足了多孔性和多孔性网络的构建要求，为具有多孔性和多孔性的功能分子材料提供了良好的候选材料。
A new compound, {[Co(bmzbc)2]·2DMF}n(JXNU-1,JXNUdenotes Jiangxi Normal University), based on the 4-(benzimidazole-1-yl)benzoate (bmzbc–) ligand has been synthesized and structurally characterized. The Co(II) ions are bridged by the rod-like bmzbc–ligands to give a two-dimensional (2D) sheet wherein the Co(II) ions are spatially separated from each other by the long bmzbc–rods. The 2D sheets are further stacked into a 3D framework with 1D channels occluding the guest DMF molecules. Detailed magnetic studies show that the individual octahedral Co(II) ions inJXNU-1exhibit field-induced slow magnetic relaxation, which is characteristic behavior of single-ion magnets (SIMs). The rarely observed positive value of zero-field splitting (ZFS) parameterDfor the Co(II) ion inJXNU-1demonstrates thatJXNU-1is a unique example of Co(II)-based SIMs with easy-plane anisotropy, which is also confirmed by the calculations. The microporous nature ofJXNU-1was established by measuring CO2sorption isotherms. The abrupt changes observed in the C3H8and C2H6adsorption isotherms indicate that a structural transformation occurred in the gas-loading process. The long connection between the magnetic metal centers inJXNU-1meets the requirements for construction of porosity and SIM in a well-defined network, harmoniously providing a good candidate of functional molecular materials exhibiting SIM and porosity.