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在水热条件下,制备了二维层状配位聚合物[Cd(C2O4)(H2O)2].H2O(1)的单晶体,对其进行了X射线粉末衍射、元素分析、红外光谱、热重分析和X射线单晶衍射测定。单晶结构分析表明,该晶体属于三斜晶系,P-1空间群,晶胞参数a=0.60109(12)nm,b=0.66607(13)nm,c=0.84987(17)nm,α=74.72(3)°,β=74.33(3)°,γ=81.07(3)°,V=0.31473(11)nm3,Z=2,R1=0.015,ωR2=0.0368。草酸镉单晶结构由两个2D层构成,每一个2D层是由[Cd2(C2O4)2(H2O)4].2H2O的重复单元形成,每个单元是由一个七配位独立镉原子配位而成(五个草酸氧原子和两个水分子氧原子)。2D层与层之间通过不同层草酸分子与配位水分子之间及草酸与客体水分子之间形成的氢键将2D层状化合物连成一个3D超分子结构。热重分析表明该配位聚合物在340℃下稳定。
A single crystal of two-dimensional layered coordination polymer [Cd (C2O4) (H2O) 2] .H2O (1) was prepared under hydrothermal conditions and characterized by X-ray powder diffraction, elemental analysis, infrared spectrum, Reanalysis and X-ray single crystal diffraction measurements. Single crystal structure analysis shows that the crystal belongs to the triclinic system with P-1 space group, the unit cell parameters are a = 0.60109 (12) nm, b = 0.66607 (13) nm, c = 0.84987 (3) °, β = 74.33 (3) °, γ = 81.07 (3) °, V = 0.31473 (11) nm3, Z = 2, R1 = 0.015, ωR2 = 0.0368. The single crystal structure of cadmium oxalate is composed of two 2D layers, each of which is formed of repeating units of [Cd2 (C2O4) 2 (H2O) 4] .2H2O and each unit is coordinated by a seven-coordinated independent cadmium atom And into (five oxalate oxygen atoms and two water molecules oxygen atoms). The 2D lamellae are linked into a 3D supramolecular structure by the hydrogen bonding between different layers of oxalic acid molecules and coordinated water molecules and between the oxalic acid and guest water molecules. Thermogravimetric analysis shows that the coordination polymer is stable at 340 ° C.