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首页> 外文期刊>Crystal growth & design >Structural Characterization, Water Adsorption, and Magnetic Properties of Two Composite Mn(II)-Squarate-dpe Supramolecular Architectures
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Structural Characterization, Water Adsorption, and Magnetic Properties of Two Composite Mn(II)-Squarate-dpe Supramolecular Architectures

机译:两种复合MN(II)的结构表征,水吸附和磁性 - 静脉曲张 - DPE超分子架构

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摘要

Two supramolecular architectures, [Mn(Hdpe)-(C4O4)(0.5)(H2O)(3)][Mn-(C4O4)(2)(H2O)(2)] (1) and [Mn-(Hdpe)(2)(H2O)(4)][Mn-(C4O4)(2)(H2O)(2)](2)center dot 8H(2)O (2) (C4O42- = dianion of squaric acid (H2C4O4); dpe = 1,2-bis(4-pyridyl)ethane), have been synthesized in one-pot reactions and structurally characterized by single-crystal X-ray diffraction methods. Compounds 1 and 2 are both 2D coordination polymers with interdigitated layers, constructed by two two-dimensional (2D) anionic [Mn(mu(1,3)-C4O4)(2) (H2O)(2)](2-) layered metal-organic frameworks (MOFs) with their open square-grid windows penetrated by the anti-Hdpe(+) ligands of the, cationic [Mn (Hdpe) (mu(1,2,3,4)- C4O4)(0.5)(H2O)(3)](2+) layered MOF in 1 and the cationic [Mn(Hdpe)(2)(H2O)(4)](4+) monomers in 2, to generate 2D trilayered and 2D bilayered frameworks, respectively. Both of them are then extended to 3D supramolecular architectures via strong intermolecular interactions, including hydrogen bonds and pi-pi stacking interactions, among the neighboring 2D frameworks. Compounds 1 and 2 exhibit significant water vapor hysteresis isotherms, and their cyclic water de-/adsorption behavior accompanied by a structural transformation has been verified by TG analyses and PXRD measurements through de-/rehydration processes. The magnetic properties of 1 and 2 suggest that the weak antiferromagnetic behavior is related to the weak inter-Mn(II) interactions via C4O42- bridges in the 2D frameworks.
机译:两个超分子架构[Mn(HDPE) - (C4O4)(0.5)(0.5)(H 2 O)(3)] [Mn-(C 4 O 4)(2)(2)(2)(2)(2))(1)和[Mn-(HDPE)( 2)(H 2 O)(4)] [Mn-(C4O4)(2)(2)(2)(2)(2)(2)℃(2)(2)(2)(C4O42- =脱乳酸(H2C4O4); DPE = 1,2-双(4-吡啶基)乙烷)已在单盆反应中合成,并在结构上以单晶X射线衍射方法表征。化合物1和2是2D配位聚合物,其均具有叉分层,由两个二维(2D)阴离子[Mn(mu(1,3)-C 4 O 4)(2)(2)(2)(2)层分)构成金属有机框架(MOFS)与阳离子[Mn(HDPE)(MU(1,2,3,4) - C4O4)(0.5)的抗HDPE(+)配体穿透抗HDPE(+)配体渗透(H 2 O)(3)](2+)在1中的1和阳离子[Mn(HDPE)(2)(2)(2)(4)(4)单体中的阳离子MOF,在2中产生2D三层和2D双层框架,分别。然后,在相邻的2D框架中,它们通过强的分子间相互作用,包括氢键和PI-PI堆叠相互作用的强分子相互作用,它们两者延伸到3D超分子架构。化合物1和2表现出显着的水蒸气滞后等温,通过TG分析和PXRD测量通过脱水方法验证了其伴有结构转化的环状水去/吸附行为。 1和2的磁性特性表明,弱的反铁磁性行为与2D框架中C4O42桥的弱Inter-Mn(II)相互作用有关。

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