苯甲酸与含氮配体构筑的两种铅配合物的水热合成、结构与性质研究

用水热合成方法得到了2个二价铅配合物Pb(BA)2(phen)].(HBA)(1)及Pb(2,2′-bipy)(BA)(NO3)]n(2)(HBA=benzoic acid;phen=1,10-phenanthroline;2,2′-bipy=2,2′-bipyridine),对它们进行了元素分析、红外光谱、荧光光谱、粉晶衍射及热分析表征,并通过X-射线单晶衍射测定了配合物的单晶结构。X-射线单晶结构解析表明,配合物1与2均属三斜晶系,P1空间群。化合物1中,弱Pb…O相互作用、分子间氢键及π…π堆积作用共同构筑了配合物1的三维框架结构。铅的6s孤电子具有立体化学活性,使配位键分布于半球型区域。化合物2中,相邻的PbⅡ离子通过螯合-桥联的硝酸根联结成一维链状结构,广泛存在的π…π堆积作用将邻近的一维链堆积成三维超分子结构。化合物2中的6s孤对电子未显示出立体化学活性,其配位键近似分布于全球型区域。

Hydrothermal Syntheses, Crystal Structures and Properties of Two Lead Compounds with Benzoic Acid and N-Donor Ligands

Two coordination compounds Pb (BA)2(phen)] ·(HBA) (1) and Pb(2,2'-bipy) (BA)(NO3)]n (2) (HBA:benzoic acid; phen:1,10-phenanthroline; 2,2'-bipy:2,2'-bipyridine) have been synthesized by hydrothermal methods and characterized by elemental analysis,IR spectra,fluorescence,powder X-ray diffraction and thermal analysis,and the crystal structures were determined by single-crystal X-ray diffraction.Both compounds crystallize in the Triclinic system,space group P1.In compound 1,the weak Pb…O interactions,intermolecular H-bond and π…π stacks construct the complex into stable 3D framework.The lone pairs of electrons are clearly active and the coordination sphere of Pb Ⅱ ions is hemidirected.In compound 2,the adjacent Pb Ⅱ ions are linked by nitrate groups in the chelating-bridging coordination mode,resuhing in a 1D chain structure.The extensive π …π interactions connect the neighboring 1D chains into 3D supramolecular structure.The lone pairs of PbⅡ are inactive and the coordination sphere is holodirected in compound 2.CCDC:803044,1; 803057,2.