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首页> 外文期刊>Crystal growth & design >Enlarging an isoreticular family: 3,3′,5,5′-tetramethyl-4, 4′-bipyrazolato-based porous coordination polymers
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Enlarging an isoreticular family: 3,3′,5,5′-tetramethyl-4, 4′-bipyrazolato-based porous coordination polymers

机译：扩大一个等孔网络家族：3,3'，5,5'-四甲基-4，4'-联吡唑基的多孔配位聚合物

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The solvothermal reaction between the rigid spacer 3,3′,5,5′- tetramethyl-4,4′-bipyrazole (H_2Me_4BPZ) and a number of transition metal salts promoted the formation of the coordination polymers [M(Me_4BPZ)] (M = Zn, 1; Co, 2; Cd, 3; Cu, 4). Ab initio X-ray powder diffraction analyses revealed the main structural aspects of the four materials. 1 and 2 are representative examples of the so-called isoreticular strategy: isostructural to [M(BPZ)] and [M(BDP)] (H_2BPZ = 4,4′- bipyrazole; H_2BDP = 1,4-bis(1H-pyrazol-4-yl)benzene), they feature three-dimensional (3-D) porous networks containing square-shaped channels. In 3, tetrahedral Cd(II) ions are arranged within homochiral helices reciprocally linked by radial Me_4BPZ spacers, overall creating a 3-D nonporous network. Finally, the 3-D porous framework of 4 comprises square Cu_4 nodes linked to eight neighboring ones by the bridging spacers. Thermogravimetric analyses, coupled to variable-temperature X-ray powder diffraction, demonstrated the remarkable thermal robustness of all the materials, decomposing above 300 C, and their stability for consecutive heating-cooling cycles. N_2 and CO_2 adsorption measurements at 77 and 273 K, respectively, were employed to probe the permanent porosity of the materials and to give a coherent picture of their textural properties including specific surface areas, micro- and mesopore volumes, as well as size distributions.
机译：刚性间隔基3,3'，5,5'-四甲基-4,4'-联吡唑（H_2Me_4BPZ）与多种过渡金属盐之间的溶剂热反应促进了配位聚合物[M（Me_4BPZ）]的形成＝ Zn，1; Co，2; Cd，3; Cu，4）。从头算X射线粉末衍射分析揭示了这四种材料的主要结构方面。图1和2是所谓的等网状策略的代表性示例：[M（BPZ）]和[M（BDP）]的同构结构（H_2BPZ = 4,4'-联吡唑; H_2BDP = 1,4-双（1H-吡唑） -4-yl）苯），它们具有包含方形通道的三维（3-D）多孔网络。在图3中，四面体Cd（II）离子被排列在通过径向Me_4BPZ间隔子相互连接的同手性螺旋内，整体上形成了3-D无孔网络。最后，4的3-D多孔框架包括通过桥接间隔物链接到八个相邻的方形Cu_4节点。热重分析与可变温度X射线粉末衍射相结合，证明了所有材料在300°C以上都会分解的出色热稳定性，以及连续加热-冷却循环的稳定性。分别在77 K和273 K下进行N_2和CO_2吸附测量，以探测材料的永久孔隙率，并给出其结构特性（包括比表面积，微孔和中孔体积以及尺寸分布）的连贯图像。

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