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首页> 外文期刊>Chemistry: A European journal >A Promising Mg~(II)-Ion-Selective Luminescent Probe: Structures and Properties of Dy-Mn Polymers with High Symmetry
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A Promising Mg~(II)-Ion-Selective Luminescent Probe: Structures and Properties of Dy-Mn Polymers with High Symmetry

机译：一种有前景的Mg〜（II）-离子选择性发光探针：具有高对称性的Dy-Mn聚合物的结构和性能

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摘要

Two Dy-Mn polymers,{[Dy(L~l)_3Mn_(1.5)(H_2O)_3]centre dot 3.125 H_2O}_n (1,L~1 = pyridine-2,6-dicarboxylic acid) and {[Dy(L~2)_3Mn_(1.5)(H_2O)_6]centre dot 8.25H_2O}_n (2,L~2 = 4-hydroxylpyridine-2,6-dicarboxyl-ic acid),with high symmetry (S_6) have been prepared.Polymer 1 has a nano-porous 3D framework with channel of about 17.6 A diameter,while 2 has a honeycomb-type 2D structure with the cavity of approximately 14.4 A diameter.In the construction of multidimensional porous polymers with 3d-4f mixed metals,it is the first observation that a ligand substituent effect leads to dramatic differences in the structures formed.Luminescent studies reveal that the emission intensities of 1 and 2 increase significantly upon the addition of Mg~(2+),whereas the introduction of other metal ions leaves the intensity unchanged or even weakens it;hence,both of them may serve as good candidates of Mg~(2+) luminescent probes.To our knowledge,complex 1 is also the first example of a 3d-4f metal-based nanoporous polymer to exhibit luminescent selectivity for Mg~(2+).Magnetic susceptibility measurements reveal a rather rare ferromagnetic interaction in 2.Thermal gravimetric analyses and powder X-ray diffraction investigations have also been performed,suggestive of high thermal stability of 1.
机译：两种Dy-Mn聚合物，{[Dy（L〜l）_3Mn_（1.5）（H_2O）_3]中心点3.125 H_2O} _n（1，L〜1 =吡啶-2,6-二羧酸）和{[Dy（制备了对称性高的L〜2）_3Mn_（1.5）（H_2O）_6]中心点8.25H_2O} _n（2，L〜2 = 4-羟基吡啶-2,6-二羧基酸）。聚合物1具有纳米孔3D骨架，其通道的直径约为17.6 A，而聚合物2具有蜂窝型2D结构，其腔体的直径约为14.4A。在具有3d-4f混合金属的多维多孔聚合物的构造中发光研究表明，加入Mg〜（2+）后1和2的发射强度显着增加，而引入其他金属离子则导致配体取代效应导致所形成的结构发生巨大变化。强度不变甚至减弱;强度都可以作为Mg〜（2+）发光探针的候选材料。据我们所知，配合物1也是3d-4f金属基n的第一个例子。磁化率测量显示2中相当罕见的铁磁相互作用。还进行了热重分析和粉末X射线衍射研究，表明1具有较高的热稳定性。

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