一系列萘羧酸膦酸镧系配合物的合成、结构和荧光性质  

Synthesis,structures,and luminescent properties of a series of lanthanide carboxylate⁃phosphonates

作　　者：徐艳[1] 李素芝 李新星[1] XU Yan;LI Su‑Zhi;LI Xin‑Xing(Department of Materials Engineering,Institute of Information Engineering,Suqian University,Suqian,Jiangsu 223800,China)

机构地区：[1]宿迁学院信息工程学院材料工程系,宿迁223800

出　　处：《无机化学学报》2023年第10期1950-1958,共9页Chinese Journal of Inorganic Chemistry

基　　金：江苏省青蓝工程;宿迁学院科研平台(No.2021pt04);宿迁学院西楚高层次人才;宿迁市重点实验室基金(No.M202109)资助。

摘　　要：在溶剂热条件下,5-羧酸-1-萘膦酸(5-pncH_(3))和稀土硝酸盐反应合成得到3例萘羧酸膦酸镧系配合物:[Pr(5-pnc)(H_(2)O)]·2H_(2)O(1)、[Sm(5-pnc)(H_(2)O)]·H_(2)O(2)和[Eu(5-pnc)(H_(2)O)]·H_(2)O(3)。采用单晶X射线衍射、粉末X射线衍射、元素分析、红外光谱、热重分析和荧光光谱对配合物进行了表征。晶体结构表明,每个七配位的镧系离子由来自5个膦酸盐配体的6个O原子和来自1个配位水分子的一个O原子配位。[LnO_(7)]通过O—C—O、O—P—O或—O—单元连接成一维双金属链结构,一维双金属链再进一步由萘羧酸膦酸配体(5-pnc^(3-))连接成三维开放骨架结构。荧光性质研究表明,配合物3在330 nm的激发光下,发射Eu的红色特征荧光,而配合物1和2在蓝光区显示出非常宽的配体中心发射带。Three lanthanide carboxylate‑phosphonates based on lanthanide nitrate hexahydrate and(5‑carboxynaphthalen‑1‑yl)phosphonic acid(5‑pncH_(3))formulated as[Pr(5‑pnc)(H_(2)O)]·2H_(2)O(1),[Sm(5‑pnc)(H_(2)O)]·H_(2)O(2),and[Eu(5‑pnc)(H_(2)O)]·H_(2)O(3)has been obtained as single phases under solvothermal conditions.Complexes 1‑3 were characterized by single‑crystal X‑ray diffraction,powder X‑ray diffraction,elemental analysis,IR spectra,thermogravimetric analysis,and fluorescence spectra.Crystal structures reveal that each lanthanide ion is seven‑coordinated by six O atoms from five phosphonate ligands and one O atom from one water molecule.The building blocks[LnO_(7)]of complexes 1‑3 are linked into a 1D double metal chain structure by the O—C—O,O—P—O,or—O—units.The 1D double metal chain is fused into a 3D open‑framework structure by 5‑pnc^(3-).Complex 3 exhibited very strong characteristic emission bands for the Eu􀃮ion in the visible region under 330 nm excitation.Complexes 1 and 2 displayed very broad ligand‑centered emission bands in the blue light region.CCDC:2258142,1;2258143,2;2006506,3.

关 键 词：配合物 羧酸膦酸 晶体结构 荧光性质 

分 类 号：O614.334[理学—无机化学] O614.337[理学—化学] O614.338