【摘要】 以2,6-吡啶二甲酸(pda)、醋酸锌在碱性条件下合成了[ZnNa2(pda2)(H2O)6].H2O,通过元素分析、红外光谱、热分析及X射线单晶衍射对其进行了表征.在配位聚合物中,[Zn(pda2)]2-结构单元与作为模版的"之"字形Na链相连接形成了具有右手螺旋结构的聚合物分子,进而通过层间π-π堆积成为三位空间结构.在配合物中,Zn和Na原子分别为六配位八面体及五配位三角双锥配位环境.红外光谱及X射线单晶衍射分析表明配体中的羧基采取单齿配位模式.实验表明,标题配合物对于CO2与环氧化合物在较温和条件下合成环状碳酸酯具有较高的催化活性.更多还原

【Abstract】 The title complex of [ZnNa2(pda)2(H2O)6]·H2O(pda=2,6-pyridinedicarboxylic acid) was assembled by the reaction of zincum acetate,H2pda and sodium hydroxide.The complex was characterized by elemental analysis,thermal analysis,infrared spectra and its crystal structure was determined by single crystal X-ray diffraction,which indicates that Na ions act as templates for the construction of the [Zn(pda)2]2-units into neutral polymers.The [Zn(pda)2]2-units connect to the zigzagged Na chains to form right-handed helical structure,which are assembled into 3D layer-stack-like architecture via π-π aromatic stacking interaction.Zn and Na centers take on six-coordinated octahedral and five-coordinated trigonal bipyramid environment,respectively.The infrared spectra and single crystal X-ray diffraction suggest that the carboxyl groups adopting monodentate coordination mode.Experiment shows that the title complex is an efficient catalyst to catalyze the reactions of CO2 with epoxides under mild reaction conditions.更多还原