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以3,5-双(4-羧基-苯氧基)苯甲酸(H_3BCPBA)、1,3-双(咪唑基)丙烷(bip)与硝酸镉为反应物,在水热、溶剂热条件下以不同的反应温度和不同的降温速率,分別合成出了2种金属-有机骨架(MOF)化合物:{[Cd_(1.5)(BCPBA)(bip)]·H_2O·DMF}_n(1)和[Cd_(1.5)[BCPBA)(bip)_(0.5)(H_2O)]_n(2)。通过X射线单晶衍射(XRD)确定其结构,并用红外光谱(IR)、元素分析、热重(TG)和粉末X射线衍射仪(PXRD)等对其进行表征,并测试了2种化合物的荧光属性。结构表明化合物1中Cd1原子先与3个BCPBA~(3-)配体配位,形成一个一维链结构,2个相邻的一维链通过Cd2原子由羧基氧桥接在一起。然后由含氮配体将一维的双链连结成一个二维的层结构。化合物2是一个由新颖的篮子型六连结的三核Cd(Ⅱ)二级结构单元(SBUs)构筑的二维层结构。
The reaction of 3,5-bis (4-carboxy-phenoxy) benzoic acid (H_3BCPBA), 1,3-bis (imidazolyl) propane (bip) with cadmium nitrate was carried out under hydrothermal and solvothermal conditions Two kinds of metal-organic framework (MOF) compounds were synthesized: {[Cd_ (1.5) (BCPBA) (bip)] · H_2O · DMF} _n (1) and [Cd_ (1.5) [BCPBA] (bip) _ (0.5) (H_2O)] _ n (2). Its structure was confirmed by X-ray single crystal diffraction (XRD), and its structure was characterized by IR, elemental analysis, TG and PXRD, Fluorescence properties. The results show that the Cd1 atom in compound 1 is first coordinated with three BCPBA3- ligands to form a one-dimensional chain structure, and two adjacent one-dimensional chains are bridged by carboxyl oxygen through Cd2 atoms. The one-dimensional double-stranded chains are then joined by a nitrogen-containing ligand into a two-dimensional layer structure. Compound 2 is a two-dimensional layer structure constructed by novel three-core Cd (Ⅱ) secondary structural units (SBUs) with six types of baskets.