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利用水热合成手段,(2-吡啶甲基)胺基甲基膦酸、草酸盐与醋酸钆(或醋酸铽)配位组装得到2个同构的稀土化合物Ln2(pmampH)(C2O4)2.5(H2O)3.4H2O(Ln=Gd(1),Tb(2))。在2个化合物中,网状的{Ln2(C2O4)2.5}n层通过{LnO8}多面体与{PO3C}四面体的共角连接,形成三维开放结构。沿b方向,可以观察到一维孔道,它们被未配位的(2-吡啶甲基)胺基以及晶格水分子占据。化合物2在部分或全部脱去结构中的配位以及晶格水以后,可以保持它的骨架结构。磁性研究表明化合物1表现出顺磁行为,2则表现出主要的铁磁性相互作用。化合物2以及它的脱水产物的荧光性质也被测定,都表现出Tb(Ⅲ)的特征发射,能够发出绿光。
Two isomorphic rare earth compounds Ln2 (pmampH) (C2O4) 2.5 were synthesized by hydrothermal synthesis using (2-picolyl) aminomethylphosphonic acid, oxalate and gadolinium acetate (or terbium acetate) (H2O) 3.4 H2O (Ln = Gd (1), Tb (2)). Among the two compounds, the network of {Ln2 (C2O4) 2.5} n was connected to the common corner of the {PO3C} tetrahedra through the {LnO8} polyhedron to form a three-dimensional open structure. In the b direction, one-dimensional pores can be observed, which are occupied by uncoordinated (2-picolyl) amine groups and lattice water molecules. Compound 2 retains its framework structure after partial or complete debonding of the structure and lattice water. Magnetic studies show that compound 1 exhibits paramagnetic behavior and 2 exhibits major ferromagnetic interactions. The fluorescence properties of the compound 2 and its dehydration products were also determined. All showed the characteristic emission of Tb (Ⅲ), which could emit green light.