以N-甲基咪唑(min)为配体,采用离子热方法在离子液体(1-乙基-3-甲基咪唑溴盐)中合成了Co(Ⅱ)配合物{[Co(min)6]Br·2H2O,1},其结构经IR和元素分析表征。X-射线单晶衍射分析表明:1属单斜晶系,P21/c空间群,晶胞参数:a=0.8182(2)nm,b=1.3573(2)nm,c=1.6234(19)nm,β=111.12(4)°,V=1.682(5)nm^3.De=1.476g·cm^-3,F(000)=762,Z=2,μ(MoKa)=2.927mm^-1,R1=0.0368,R2=0.0989。在1的晶体结构中,钴(Ⅱ)与配位原子形成畸变的八面体结构。采用循环伏安法研究了1在水溶液中的电化学性质,结果表明1中存在一对可逆的氧化还原峰,其峰值分别为0.51V和0.25V,为Co(Ⅱ)/Co(Ⅲ)间的相互转化。
The crystal of cobalt complex, [ Co (mim) 6 ] Br2 · 2H2O ( 1 ), was synthesized from N-methylimidazol(min) in ionic liquid(1-ethyl-3-methylimidazolium) by ionothermal method. The structure was characterized by IR and elemental analysis. X-ray diffraction analysis showed that 1 belongs to monoclinic system, space group P21/C with a =0.818 2(2) nm, b =1.357 3(2) nm, c =1.623 4(19) nm, β =111.12(4)°, V=1.682(5) nm^3, Dc =1.476 g · cm^-3, F(000) =762, Z=2, μ(MoKα) = 2.927 mm^-1, R1 =0.036 8, R2 =0.098 9. The central atom Co(II) and the coordinated atoms form a slightly distorted octahedral geometry in the crystal structure of 1. The electrochemical property of 1 in water was investigated by cyclic voltammetry. The results showed that 1 exhibited two redox waves at 0.51 V and 0.25 V(versus SCE) in water corresponding to the [ Co(II) ]/[ Co(III) ] couples.