2-氯-4-氟苯甲酸与5，5'-二甲基-2，2'-联吡啶镧系配合物的晶体结构、光谱和热行为

合成并表征了2个双核配合物Pr （2-Cl-4-FBA）₃（5,5''-DM-2,2''-bipy）]₂（1）和Dy （2-Cl-4-FBA）₃（5,5''-DM-2,2''-bipy）]₂·2（2-Cl-4-FHBA）（2）,其中2-Cl-4-FHBA=2-氯-4-氟苯甲酸,5,5''-DM-2,2''-bipy=5,5''-二甲基-2,2''-联吡啶。配合物1以八配位的Pr³⁺为中心,其周围的配位环境为扭曲的三角十二面体。配合物2的结构是独特的,它包含2个自由的2-氯-4-氟苯甲酸分子,并以九配位的Dy³⁺为中心与周围的氮、氧原子形成扭曲的三棱镜几何构型。这2个配合物均结晶于三斜晶系P1空间群,并通过氢键相互作用和π-π堆积作用形成了一维和二维超分子结构。研究了配合物的热分解过程,结果表明配合物1和2分别分为4步和5步进行分解。同时对配合物的三维红外堆积图进行了研究,结果表明,整个热分解过程中释放出的主要气态产物是水、二氧化碳和有机小分子碎片。配合物2的荧光性质研究表明,它可以发射出Dy³⁺的特征跃迁对应的荧光。

Crystal structure, spectra, and thermal behavior of lanthanide complexes with 2-chloro-4-fluorobenzoic acid and 5,5'-dimethyl-2,2'-bipyridine

Two binuclear complexesPr(2-Cl-4-FBA)₃(5,5''-DM-2,2''-bipy)]₂ (1) andDy(2-Cl-4-FBA)₃(5,5''-DM-2,2''-bipy)]₂·2(2-Cl-4-FHBA) (2), where 2-Cl-4-FHBA=2-chloro-4-fluorobenzoic acid and 5,5''-DM-2,2''-bipy=5,5''-dimethyl-2,2''-bipyridine, have been fabricated and characterized. The two complexes crystallize in the P1 space group of the triclinic crystal system, featuring 1D and 2D supramolecular structures. The structure of complex 2 is fascinating, containing two free 2-Cl-4-FHBA molecules, which are rare in lanthanide complexes. A three-dimensional infrared stacking diagram of the gas phase products indicates that the main gaseous products released over the whole decomposition process are water, carbon dioxide, some gaseous molecules, and the gaseous organic fragments. Also, the fluorescence property of complex 2 has been studied.