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合成了稀土苦味酸盐(pic)与配体2,6-二(2-苯并咪唑基)吡啶(L)的配合物,通过元素分析、红外光谱及电子光谱对配体及配合物进行了表征,并用X射线单晶衍射测定了配合物[CeL2(pic)2](pic)?(CH3OH)3的晶体结构.配合物属于三斜晶系,空间群为P-1,晶胞参数a=1.3795(3)nm,b=2.1292(5)nm,c=2.5651(6)nm,α=105.847(3)°,β=100.150(3)°,γ=107.893(3)°,Z=2,R=0.0519,wR=0.1255.晶体中一个不对称单元内有两个结晶学上独立的分子,这两个分子的构型基本相同,中心Ce3+均与两个三齿配位的配体及两个双齿配位的苦味酸根配位,配位数为10.中心Ce3+的配位多面体为变形双帽四方反棱柱,两个分子之间以π-π堆积连接,生成一个非中心对称的二聚体.整个晶体则是由这些二聚体以分子间氢键作用连接成三维网状超分子结构.室温下,在紫外光激发下Eu(III)配合物固体和溶液均表现出中心离子的特征荧光发射.
The complexes of rare earth picrate with ligand 2,6-bis (2-benzimidazolyl) pyridine (L) were synthesized and the ligands and complexes were characterized by elemental analysis, IR and electron spectroscopy The crystal structure of the complex [CeL2 (pic) 2] (pic) (CH3OH) 3 was characterized by X-ray single crystal diffraction.The complexes belong to the triclinic system with the space group P-1 and the unit cell parameters a = 1.3795 (3) nm, b = 2.1292 (5) nm, c = 2.5651 (6) nm and α = 105.847 (3) °, β = 100.150 , R = 0.0519, wR = 0.1255. There are two crystallographically independent molecules in one asymmetric unit in the crystal. The configurations of these two molecules are basically the same. The centers of Ce3 + and two tridentate ligands and Two bidentate coordination of picrates with coordination number 10. Coordination polyhedron center Ce3 + is deformed double cap tetragonal antiprism, the two molecules connected by π-π stacking to generate a non-centrosymmetric Dimer.The whole crystal is composed of these dimers by intermolecular hydrogen bonding to form a three-dimensional network of supramolecular structure.Under UV excitation of Eu (III) complex solid and solution showed a central ion The characteristic fluorescence emission.