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通过水热方法,以2,4,4′-联苯三羧酸(H3btc)和2,2′-联吡啶(2,2′-bpy)与CoCl2·6H2O反应,合成了1个具有三核钴单元的三维配位聚合物[Co1.5(btc)(2,2′-bpy)0.5(2H2O)]n,并对其结构和磁性质进行了研究。结构分析结果表明该聚合物的晶体属于单斜晶系,I2/a空间群,a=1.774 4(4)nm,b=1.142 3(2)nm,c=1.890 8(4)nm,β=105.18(3)°,V=3.698 5(13)nm3,Dc=1.745 g·cm-3,Z=8,R=0.048 4,wR=0.085 2(I>2σ(I))。来自4个不同btc3-配体的4个羧基连接相邻的3个钴(Ⅱ)离子形成了1个三核钴(Ⅱ)的结构单元。这些三核钴(Ⅱ)的结构单元又通过btc3-配体与钴(Ⅱ)离子的配位作用形成了1个三维的框架。研究表明,该聚合物中相邻钴(Ⅱ)离子之间存在铁磁相互作用。
By hydrothermal method, 2,4,4’-biphenyl tricarboxylic acid (H3btc) and 2,2’-bipyridine (2,2’-bpy) with CoCl2 · 6H2O reaction, Cobalt units of the three-dimensional coordination polymer [Co1.5 (btc) (2,2’-bpy) 0.5 (2H2O)] n, and its structure and magnetic properties were studied. The results of the structure analysis show that the crystal of the polymer belongs to the monoclinic space group, a = 1.774 4 (4) nm, b = 1.142 3 (2) nm and c = 1.890 8 105.18 (3) °, V = 3.698 5 (13) nm3, Dc = 1.745 g · cm -3, Z = 8, R = 0.048 4, wR = 0.085 2 (I> 2σ (I)). The four carboxyl groups from four different btc3-ligands link the adjacent three cobalt (II) ions to form one trinuclear cobalt (II) building block. These trinuclear cobalt (II) structural units in turn form a three-dimensional framework by coordination of btc3-ligand with cobalt (II) ions. Studies have shown that there is ferromagnetic interaction between adjacent cobalt (II) ions in this polymer.