摘要
近年来，铅的配位聚合物以其丰富的结构与在离子交换和光学等领域中的应用前景而引起了广泛关注。由于铅的原子半径较大．可以形成较高的配位数;另外．二价铅的白轨道上有一对孤对电子，它对成键电子对的排斥而使铅离子周围的配位键趋向于分布在半球形的区域内．使配位数相对较低。
The coordination polymer [Pb2（m-ta）4· （H2O）2]n （H m-ta=m-toluic acid） was synthesized under hydrothermal conditions and characterized via IR, CHN elemental analysis, and single crystal X-ray diffraction analysis. The complex belongs to monoclinic system, space group P21/n with a=0.717 45（3） nm, b=4.274 5 （2） nm, c=1.071 26（5） nm,β=90.765 0（10） °, V=3.285 0（3） nm^3, Z=4, Dc=2.004 g·cm^-3, F（000）= 1 872,μ=10.291 mm^-1, R1=0.035 2, wR2= 0.065 1. The asymmetric unit contains two Pb ^ Ⅱatoms, four m-ta ligands and two water molecules. Each Pb ^Ⅱ is heptacoordinated, belonging to the hemidirected coordination geometry. The Pb atoms are bridged through the carboxylate O atoms, leading to a central Pb2O2 core. The coordinating water molecules and carboxylate O atoms are involved in extensive O-H... O hydrogen-bonding interactions. The complex has an extended chain structure and the chains are assembled by hydrogen bonds and π-π interactions （centroid-eentroid distance =0.362 46 nm） into a three-dimensional supramolecular structure. The luminescent property in solid state of complex has been further studied and discussed. CCDC： 735407.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2010年第1期176-180,共5页
Chinese Journal of Inorganic Chemistry
基金
河南省自然科学基金(No.2007620004)
国家自然科学基金(No.20901028)
河南理工大学博士基金(No.B2008-58648265)资助项目
关键词
间甲基苯甲酸
水热合成
铅配合物
晶体结构
荧光性质
m-toluic acid
hydrothermal synthesis
lead complex
crystal structure
luminescence
