摘要
用高氯酸铕和3,5-吡啶二甲酸、2,4,6-吡啶三甲酸在水热条件下反应合成了一个含有两种吡啶多羧酸阴离子配体的三维配位聚合物{[Eu2(2,4,6-Hptc)(3,5-pdc)2(H2O)8]·6H2O}n(1)(2,4,6-H3ptc=2,4,6-吡啶三甲酸;3,5-H2pdc=3,5-吡啶二甲酸)。单晶X-射线衍射分析表明,该配合物属单斜晶系,C2/c空间群,晶胞参数为a=2.0106(11)nm,b=1.1048(6)nm,c=1.7591(10)nm,β=112.117(8)°,α=γ=90°。配合物的中心Eu^(3+)与九个氧原子配位,其中五个氧原子来自配体羧基氧原子,四个来自配位水分子,这些氧原子形成了变形三帽三棱柱结构。3,5-pdc阴离子的两个羧酸根分别以螯合方式连接两个Eu^(3+),形成一维链状结构。2,4,6-Hptc以铵盐形式用2-和6-位羧基配位,4-位羧基没有与金属离子配位,通过2,4,6-Hptc的配位将由3,5-pdc与Eu^(3+)形成的一维链连接成一维梯状链结构。该配合物在紫外光的激发下显示红色荧光,具有良好的光致发光性质。
A 3D europium coordination polymer { [Eu2（2,4,6-Hptc）（3,5-pdc）2（H2O）8]·6H2O}n（1）（2,4,6-H3 ptc = 2,4,6-pyridinetricarboxylic acid; 3,5-H2 pdc = 3,5-pyridinedicarboxylic acid） was synthesized by hydrothermal method using europium perchlorate reacting with 3,5-pyridinedicarboxylic acid and 2,4,6-pyridinetricarboxylic acid. X-ray diffraction analysis of single crystal shows that the complex is crystallized in monoclinic system,C2 / c space group. The cell parameters are as follows a = 2. 0106（11）nm,b = 1. 1048（6） nm,c = 1. 7591（10） nm,β = 112. 117（8） °,α = γ = 90°. Eu^3＋ions in the complex is coordinated with nine oxygen atoms. Five O atmos are from the carboxylate of lignds and the other four O atoms are from coordination water molecules. They are formed a distorted tricapped trigonal prism. The two carboxylates of each 3,5-pdc anion coordinates with Eu^3＋by chelating way and a 1D chain structure is formed. 2,4,6-Hptc anions coordinate with Eu^3＋by the 2-and 4-carboxylates. The 4-carboxylate does not coordinate. The 1D chain structres formed with 3,5-pdc anions and Eu^3＋are further connected by 2,4,6-Hptc anions and 1D ladder shaped structure are constructed. The complex exhibits intense characteristicluminescence of Eu^3＋with excitation of UV-rays.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2017年第1期168-173,共6页
Journal of Synthetic Crystals
基金
南开大学教育部先进能源与材料重点实验室开放基金项目(2015)
河南省高等学校重点科研项目(16A150062)
河南省许昌市科技发展计划项目(1504009)
关键词
3
5-吡啶二甲酸
2
4
6-吡啶三甲酸
铕
配位聚合物
晶体结构
光致发光
3
5-pyridinedicarboxylic acid
2
4
6-pyridinetricarboxylic acid
europium
coordination polymer
crystal structure
photoluminescence
