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在水热条件下利用间苯二乙酸,4,4’-二联吡啶和硝酸镉反应生成配位聚合物{[Cd(pda)(4,4’-bipy)(H2O)]·H2O}n(1)(1,3-H2pda=间苯二乙酸、4,4’-bipy=4,4’-二联吡啶)。其晶体结构采用红外光谱、热重分析及单晶X射线衍射等手段进行了表征。结构分析表明该配位聚合物属三斜晶系,空间群为Pī;晶体学参数:a=0.7991(4)nm,b=1.1514(5)nm,c=1.2075(5)nm;α=107.352(6)°,β=97.505(6)°,γ=108.925(6)°,V=970.8(8)nm3。其基本结构单元由两个Cd(II)离子、两个间苯二乙酸根、四个4,4’-二联吡啶、两个水分子组成。有趣的是所有的闭合环[Cd2(pda)2]通过两线状4,4’-二联吡啶支撑连接形成一维管状配位聚合物。同时对该配位聚合物的荧光性质进行研究,发现在366 nm处呈现较强的荧光发射(λex=300 nm)。
Under the hydrothermal conditions using isophthalacetic acid, 4,4’-bipyridine and cadmium nitrate react to form coordination polymer {[Cd (pda) (4,4’-bipy) (H2O)] · H2O} n (1) (1,3-H2pda = isophthalamic acid, 4,4’-bipy = 4,4’-bipyridine). Its crystal structure was characterized by infrared spectroscopy, thermogravimetric analysis and single crystal X-ray diffraction. The structural analysis shows that the coordination polymer belongs to the triclinic system with space group Pī. The crystallographic parameters are: a = 0.7991 (4) nm, b = 1.1514 (5) nm, c = 1.2075 (6) °, β = 97.505 (6) °, γ = 108.925 (6) °, V = 970.8 (8) nm3. Its basic building block consists of two Cd (II) ions, two isophthalazoles, four 4,4’-bipyridines and two water molecules. Interestingly, all the closed rings [Cd2 (pda) 2] are connected by two linear 4,4’-bipyridine supports to form one-dimensional tubular coordination polymers. At the same time, the fluorescence properties of the coordination polymer were studied and found to show strong fluorescence emission at 366 nm (λex = 300 nm).