两种手性超分子螺旋链化合物的结构、VCD和荧光分析

Structure,VCD and Fluorescence Analysis of Two Chiral Compound With Supramolecular Helical Chains

采用非手性物质合成了配位聚合物[C10H18CuN2O9S]n(1)和[C10H14CdN2O7S]n(2)。通过元素分析,红外光谱(IR),热稳定性分析,荧光光谱,X射线粉末衍射(XRD),X射线单晶衍射对其进行了分析。结构分析表明,1和2分别属于手性空间群P 65和P 6122,均在c轴方向上通过氢键形成一维超分子螺旋链。振动圆二色谱(VCD)表明两种配位聚合物都非外消旋的,分析了螺旋结构对VCD光谱影响,并对2的VCD光谱进行了理论计算,计算结果与实验相符,表明化合物手性可能来自一维超分子螺旋链。二者的固体荧光光谱分析表明:1在468nm处的宽峰为金属与配体的相互作用引起的;2在325—450nm处荧光主要由配体产生,配体与Cd的配位作用形成的刚性平面增强了荧光的强度。

Two coordination polymers [C10H18CuN2O9S]n（1） and [C10H14CdN2O7S]n（2） were synthesized from achiral materials,the compounds were characterized by elemental analysis,IR,thermogravimetry,fluorescence spectrum,X-ray powder diffraction and Xray crystallography diffraction.The structure analysis revealed that they belonged to chiral space group P65（compound 1） and P6122 （compound 2）,both presented 1D helical chains along c axis by hydrogen bond,which were not racemic evidenced by the observation of signals in vibrational circular dichroism（VCD） spectra.The helical chains of the compounds might result in generation of chirality by the study of the relation between structure and VCD spectra and the further study of VCD calculation of compound 2.The fluorescent emission spectum of the two coumpunds indicated that the bands at 468 nm were from the interactions of ligand and metal for 1,the bands at 325—450nm were from ligand for 2,and were more stronger than free ligand,because of the rigid flat formatted by ligand coordination to metal.