4-甲基-1,2,3-噻二唑-5-甲酸构筑的一维稀土配位聚合物的合成与晶体结构

Synthesis and Crystal Structures of 1D Rare Earth Polymers Constructed by 4-Methyl-1,2,3-thiadiazol-5-carboxylic Acid

由4-甲基-1,2,3-噻二唑-5-甲酸(HL,C_4H_4N_2O_2S)和相应的稀土硝酸盐Ln(NO_3)3·n H_2O(Ln=Tb,Dy,Ho,Yb)合成了4个一维稀土配位聚合物{[Ln(L)_3(H_2O)2]·H_2O}_n(Ln=Tb,1;Dy,2;Ho,3;Yb,4),均得到单晶,用元素分析、红外光谱、热重分析和X射线单晶衍射确定了产物的组成和结构。结构分析表明:4种晶体属于异质同晶型,同属于三斜晶系,空间群为Pī。每个中心金属离子Ln(III)与5个噻二唑甲酸根中的6个羧基氧原子和2个配位水分子上的两个O原子配位,配位数为8,形成一个三角十二面配位多面体。

Four 1D rare earth polymers { [Ln（ L）3（ H_2O）_2]·H_2O}_n（ Ln = Tb,1; Dy,2; Ho,3; Yb,4） weresynthesized from 4-methyl（-1）,2,3-thiadiazol-5-carboxylic acid（ HL = C_4H_4N_2O_2S） and rare earth nitrate salts Ln（ NO_3）_3·n H_2O（ Ln = Tb,Dy,Ho,Yb）. The crystal structures of the complexes were confirmed by elemental analysis,infrared red spectra,thermogravimetric analysis and single crystal X-ray diffraction method. The crystal structures analysis revealed that the four complexes belong to isomorphism,crystallize in the triclinic system,space group Pī. Every Ln（ III） cation is coordinated by six oxygen atoms from five L（-1）anions and two oxygen atoms from two coordination water molecules,forming a triangular dodecahedron coordination geometry,and the coordination number is eight.