2-(5-甲基-1,3,4-噻二唑)-硫乙酸稀土配合物的合成和晶体结构(英文)

Syntheses and Crystal Structures of Rare Earth Coordination Compoundswith 2-(5-Methyl-1,3,4-thiadiazol-2-ylthio)acetic Acid

由溶液法合成了2个稀土配合物{[Ln(Hmtyaa)3(H2O)2].H2O}n(Ln=Nd,1;Pr,2)(Hmtyaa=2-(5-甲基-1,3,4-噻二唑)-硫乙酸),用X-射线单晶衍射仪测定了配合物的单晶结构,并对其进行了元素分析、红外光谱、热重和粉末X-射线衍射等表征。晶体结构表明:配合物1和2结构相同,都属于三斜晶系,P1空间群。配合物中金属离子均采取九配位模式,金属离子被配体桥连形成一维双链结构,该一维双链被氢键和π-π作用连接成二维层状结构。

Two coordination compounds {[Ln（Hmtyaa）3（H2O）2]·H2O}n（Ln=Nd,1;Pr,2）（Hmtyaa is 2-（5-methyl-1,3,4-thiadiazol-2-ylthio）acetic acid） have been synthesized and they were structurally characterized by single-crystal X-ray diffraction,and then were characterized by elemental analysis,FTIR spectra,thermal analysis and powder X-ray diffraction.Both compounds are isostructural and crystallize in the triclinic system,space group P1.Single crystal X-ray diffraction analysis indicate that each asymmetric unit contains one metal ion and one non-coordinated water molecules and each Ln（Ⅲ）（Ln=Nd,Pr） ion adopts nine-coordinated mode in both compounds.Metal centers are bridged together by carboxylate oxygen atoms to result in a double chain structure.Weak face-to-face π-π interactions between the neighbouring parallel thiadiazole rings of the ligand link the compounds into 2D layer structures.CCDC： 653458,1;653459,2.