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水热反应条件下,碳酸锰和碳酸钡分别与水合环己烷六酸(H6LⅠ·H2O)(顺式椅式构型LⅠ:a,e,a,e,a,e)反应生成2个三维的配位聚合物[Mg3(LⅡ)(H2O)6](1)和[Ba2(H2LⅡ)(μ2-H2O)2](2)(反式椅式构型LⅡ:e,e,e,e,e,e),通过元素分析和红外光谱对这2个配位聚合物进行了表征。X射线单晶衍射分析表明配合物1属于三方晶系,R3空间群,晶胞参数为:a=1.4393(2)nm,c=1.4597(4)nm,β=120.00°,V=2.6187(10)nm3,Z=18;配合物2结构属于单斜晶系,C2/c空间群,晶胞参数为:a=1.6764(2)nm,b=0.9095(1)nm,c=1.0001(1)nm,β=105.991(2)°,V=1.4659(2)nm3,Z=4。配合物1是由反式椅式构型LⅡ配体桥连形成的高对称性的三维配位网络。在配合物2中,顺式的H6LⅠ配体也发生构型转变并脱去部分羧基质子形成H2LⅡ配体,将Ba离子连接成一个具有一维孔道的三维有孔框架结构。在这2个配合物中,环己烷六酸配体均采取反式椅式LⅡ构型,证明了碱土金属离子Mg髤及Ba髤在水热条件下通过配位作用可以稳定环己烷六酸配体的这种反式椅式构型。
Under the hydrothermal reaction conditions, manganese carbonate and barium carbonate react with hydrated cyclohexanecarboxylic acid (H6LI · H2O) (cis-chair configuration LⅠ: a, e, a, e, a, e) Of the coordination polymer [Mg3 (LII) (H2O) 6] (1) and [Ba2 (H2LII) (μ2-H2O) 2] , e, e), these two coordination polymers were characterized by elemental analysis and infrared spectroscopy. The results of X-ray single crystal diffraction analysis show that the complex 1 belongs to the trigonal system, and the space group of R3 has the unit cell parameters of a = 1.4393 (2) nm, c = 1.4597 (4) nm, β = 120.00 °, V = 2.6187 ) nm3 and Z = 18. The complex 2 belongs to the monoclinic space group C2 / c with unit cell parameters of a = 1.6764 (2) nm and b = 0.9095 nm, β = 105.991 (2) °, V = 1.4659 (2) nm3, Z = 4. Complex 1 is a highly symmetric three-dimensional coordination network formed by bridging L-type ligands of trans-chair type. In complex 2, the cis-type H6LI ligand also undergoes a conformational transition and removes some of the carboxyl protons to form H2LII ligands, which link Ba ions into a three-dimensional porous framework with one-dimensional pores. In these two complexes, the cyclohexane hexacarboxylates all adopt the trans-chair LⅡconfiguration, which proves that the alkaline earth metal ions Mg 髤 and Ba 髤 can stabilize cyclohexane hexa This trans-chair configuration of acid ligands.