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A Self-Assembled ZnII-NdIII Heterohexanuclear Dimer Based on a Hexadentate N2O4-Type Ligand and Terephthalic Acid: Synthesis Structure and Fluorescence Properties

机译:基于六齿N2O4型配体和对苯二甲酸的自组装ZnII-NdIII杂六核二聚体:合成结构和荧光性质

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摘要

A self-assembled ZnII-NdIII heterohexanuclear coordination compound [Zn4Nd2(L)4(bdc)2]·2NO3 based on a hexadentate Salamo-like chelating ligand (H2L = 1,2-bis(3-methoxysalicylideneaminooxy)ethane]) and H2bdc (H2bdc = terephthalic acid) has been synthesized and characterized by elemental analyses, IR and UV/Vis spectra, and X-ray crystallography. Two crystallographically equivalent [Zn2Nd(L)2] moieties lie in the inversion center linked by two (bdc)2− ligands leading to a heterohexanuclear dimer in which the carboxylato group bridges the ZnII and NdIII atoms. The heteropolynuclear 3d-4f coordination compound includes four ZnII atoms, two NdIII atoms, four completely deprotonated (L)2− units, two fully deprotonated (bdc)2− units, and two crystalling nitrate ions. All of the ZnII atoms in the ZnII-NdIII coordination compound possess trigonal bipyramidal geometries and the NdIII atoms possess distorted bicapped square antiprism coordination arrangements. In addition, the fluorescence properties of the ligand and the ZnII-NdIII coordination compound were investigated.
机译:基于六齿Salamo样螯合配体(H2L)的自组装Zn II -Nd III 杂六核配位化合物[Zn4Nd2(L)4(bdc)2]·2NO3合成了1,2-双(3-甲氧基水杨基亚氨基氧基氧基)乙烷和H2bdc(H2bdc =对苯二甲酸),并通过元素分析,IR和UV / Vis光谱以及X射线晶体学对其进行了表征。两个晶体学上等效的[Zn2Nd(L)2]部分位于由两个(bdc) 2-配体连接的反转中心,从而形成一个杂六核二聚体,其中羧基基团桥接Zn II < / sup>和Nd III 原子。杂多核3d-4f配位化合物包括四个Zn II 原子,两个Nd III 原子,四个完全去质子化的(L) 2-单元,两个完全去质子化的(bdc) 2-单元和两个结晶的硝酸根离子。 Zn II -Nd III 配位化合物中的所有Zn II 原子均具有三角双锥体几何形状,而Nd III 原子具有扭曲的二等位方形反棱镜协调排列。此外,研究了配体和Zn II -Nd III 配位化合物的荧光性质。

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