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首页> 外文期刊>Crystal growth & design >Coordination Polymers of Dicyanamide and Methylpyrazine: Syntheses, Structures, and Magnetic Properties
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Coordination Polymers of Dicyanamide and Methylpyrazine: Syntheses, Structures, and Magnetic Properties

机译：双氰胺和甲基吡嗪的配位聚合物：合成，结构和磁性能

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The crystal structures of M(dca)_2(Mepyz)_2·H_2O, M = Co (1), Ni (2), dca = dicyanamide, N(CN)_2~-, and Mepyz = methylpyrazine; [Mn(dca)_2(Mepyz)_2][Mn(dca)_2(Mepyz)]_2·2MeCN (3); and Mn_2(dca)_3(NO_3)(Mepyz)_2 (4) are reported. Compounds 1 and 2 are isomorphous and consist of two-dimensional (2D) (4,4) sheets, with bridging μ_(1,5)-dca ligands and trans-disposed monodentate Mepyz ligands. Compounds 3 and 4 were obtained as an intimate mixture from the same reaction mixture. Compound 3 contains both one-dimensional (1D) chains, in which Mn atoms are bridged by double μ_(1,5)-dca bridges and the Mepyz ligands are trans and monodentate, and 2D (4,4) sheets, in which similar 1D chains are connected by bridging Mepyz ligands. The structure of 4 contains two interpenetrating 4,6-connected three-dimensional networks, with bridging μ_(1,5)-dca anions, bridging Mepyz ligands, and chelating NO_3~- anions. Only very weak coupling and no long-range magnetic ordering intrinsic to these materials were observed for 1 or 2, although traces of the ferromagnets α-Co(dca)_2 and α-Ni(dca)_2 were observable in very small applied fields, with ordering temperatures at 9 and 21 K, respectively.
机译：M（dca）_2（Mepyz）_2·H_2O的晶体结构，M ＝ Co（1），Ni（2），dca ＝双氰胺，N（CN）_2〜-，和Mepyz ＝甲基吡嗪。 [Mn（dca）_2（Mepyz）_2] [Mn（dca）_2（Mepyz）] _ 2·2MeCN（3）;报告了Mn_2（dca）_3（NO_3）（Mepyz）_2（4）。化合物1和2是同构的，由二维（2D）（4,4）薄片组成，具有桥接μ_（1,5）-dca配体和易位的单齿Mepyz配体。从同一反应混合物中以紧密混合物形式获得化合物3和4。化合物3既包含一维（1D）链，其中Mn原子通过双μ_（1,5）-dca桥桥接，Mepyz配体为反齿和单齿，还包含2D（4,4）片一维链通过桥接Mepyz配体连接。 4的结构包含两个互穿的4,6连接的三维网络，具有桥接μ_（1,5）-dca阴离子，桥接Mepyz配体和螯合NO_3-阴离子。对于1或2，仅观察到非常弱的耦合，并且没有观察到这些材料固有的远距离磁有序性，尽管在很小的应用场中可以观察到铁磁体α-Co（dca）_2和α-Ni（dca）_2的痕迹，订购温度分别为9 K和21K。

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