吡啶基咪唑羧酸钴配合物的结构及磁学性质

Structure and Magnetic Property of Pyridyl-Imidazolecarboxylic Cobalt Complex

在溶剂热体系下,2-(4-吡啶基)-1氢-4,5-咪唑二羧酸(H_3L)与氯化钴反应合成了具有开放骨架结构的配合物{[Co(HL)(CH_3CH_2O)](H_3O)}_n.单晶X-射线衍射分析表明它结晶于四方晶系I4_1/a空间群(No.88),晶胞参数为:a=b=1.897 70(3)nm,c=2.489 5(8)nm,β=90°,V=8.965(4)nm^3,Z=2.其中,Co(Ⅱ)离子以八面体构型CoN_3O_3与3个HL-基团的N和O原子配位,有机配体HL-以T-型配位模式提供3个N原子和2个O原子与3个Co(Ⅱ)离子配位,形成了3,3-连接的开放骨架结构,同时对配合物的红外光谱、热稳定性和磁学行为进行了研究.

A cobalt（ Ⅱ）-2-（ 4-pyridyl）-imidazoledicarboxylic complex { [Co（ H2L）（ CH3CH2O） ]（ H2O） } n has been solvothermally synthesized by the reaction of 2-（ 4-pyridyl）-1H-4,4-imidazole dicarboxylic acid（ H3L） and cobalt chloride. Single crystal X-ray diffraction indicates that the complex crystallizes in the tetragonal system space group I41/a（ No. 88） with crystal data a = b = 1.897 7 nm,c = 2. 489 5 nm,β = 90 o,V = 8. 965 nm^3 and Z = 2. The Co（ Ⅱ） cation adopts octahedral geometry CoN3O3 chelated with three H2L-ligands while the H2L-ligand acts as a T-shape ligand with three nitrogen and two oxygen atoms to coordinate with three Co（ Ⅱ） cations,they are further interconnecting to give rise to the 3,3-coonnected framework. Furthermore,the IR spectra,TG curve and magnetic behavior has been investigated.