2-膦酸甲基-1-氧吡啶镧系金属(Ho、Er、Tm)配合物的合成及表征

Synthesis and characterization of lanthanide(Ho,Er,Tm) phosphonates constructed from 2-(pyridyl-N-oxide) methylphosphonic acid

以2-膦酸甲基-1-氧吡啶和草酸为原料,精确调节反应体系pH值,在水热条件下成功合成了三个镧系膦酸配合物:[Na Ln2(pmpa)(C2O4)2.5(H2O)4]·2H2O{Ln=Ho(1),Er(2)and Tm(3);H2pmpa:2-膦酸甲基-1-氧吡啶},经元素分析、FT-IR、X射线粉末衍射、热重分析以及近红外荧光光谱分析对配合物进行了表征,其结构经X射线单晶衍射进行了确定。结果表明:配合物1-3同构,属于三斜晶系,空间群为Pī,拓扑结构可表示为{318·436·533·64}{33}2.

Three new lanthanide phosphonates constructed from 2-(pyridyl-N-oxide)methylphosphonic acid and oxalic acid were synthesized under hydrothermal condition by regulating the pH value rigorously,namely,[NaLn 2(pmpa)(C 2O 4)2.5(H 2O)4]·2H 2O{Ln=Ho(1),Er(2)and Tm(3);H 2pmpa=2-(pyridyl-N-oxide)methylphosphonic acid;H 2C 2O 4=oxalic acid}and were characterized by elemental analysis,FT-IR,powder and single-crystal X ray diffraction analysis,thermogravimetric analysis and NIR spectrum analysis.Complexes 1–3,which were isomorphic and crystallized in a triclinic system with Pīspace group,exhibited a three-dimensional framework with the topological point symbol of{3^18·4^36·5^33·6^4}{3^3}2.