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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Two Discrete Lanthanum(III) Complexes with Bulky Aromatic Mixed Ligands: Syntheses, Crystal Structures and Fluorescent Properties
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Two Discrete Lanthanum(III) Complexes with Bulky Aromatic Mixed Ligands: Syntheses, Crystal Structures and Fluorescent Properties

机译:两种带有大量芳香族混合配体的镧(III)配合物:合成,晶体结构和荧光性质

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摘要

Two discrete lanthanide complexes with bulky aromatic mixed-ligands, {[La-2(na)(6)(Phen)(2)] - [La-2(na)(6)(phen)(2)] (1) and [La-2(na)(6)(2.2'-bipy)(2)] (2) (Hna = 1-naphthoic acid, phen = 1,10-phenanthroline, and 2.2'-bipy = 2,2'-bipyridine), have been synthesized under hydrothermal conditions and fully characterized by single-crystal X-ray crystallography, IR, elemental analysis, TGDTA and fluorescence spectra. Structure determination reveals that I contains two separate binuclear [La-2(na)(6)(phen)(2)] units, in which both crystallographically La-III ions are nine-coordinated with tricapped trigonal prism polyhedron for La1 and a distorted monocapped square antiprism arrangement for La2; whereas 2 has a binuclear structure bridged by carboxylate groups of four na anions. Due to the introduction of bulky aromatic ligands, non-classical C-H center dot center dot center dot OH-bonds and pi - involved stacking interactions become the dominantly driving forces for the supramolecular structure. The two solid complexes exhibit intense fluorescent emissions at room temperature resulted from the ligand-to-metal charge transfer.
机译:两个具有大量芳香族混合配体的离散镧系元素络合物,{[La-2(na)(6)(Phen)(2)]-[La-2(na)(6)(phen)(2)](1)和[La-2(na)(6)(2.2'-bipy)(2)](2)(Hna = 1-萘甲酸,phen = 1,10-菲咯啉和2.2'-bipy = 2,2' -联吡啶),已在水热条件下合成,并通过单晶X射线晶体学,IR,元素分析,TGDTA和荧光光谱进行了全面表征。结构确定表明,我包含两个独立的双核[La-2(na)(6)(phen)(2)]单元,其中两个晶体学La-III离子与La1的三重三角棱镜多面体九配位,并且扭曲La2的单峰方形反棱镜排列;而2具有双核结构,由四个na阴离子的羧酸根桥连而成。由于引入了庞大的芳香族配体,非经典的C-H中心点中心点中心点OH键和pi-涉及的堆积相互作用成为超分子结构的主要驱动力。由于配体到金属的电荷转移,两种固体配合物在室温下表现出强烈的荧光发射。

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