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Structural and chromotropism properties of copper(II) complexes containing a tridentate ligand
Chemical Papers ( IF 2.2 ) Pub Date : 2020-06-02 , DOI: 10.1007/s11696-020-01228-9
Motahareh Motalebi , Hamid Golchoubian , Ehsan Rezaee

Abstract

Two dinuclear complexes of [LCu(Cl)(μ-Cl)CuCl3][LCu(Cl)(μ-Cl)CuL(H2O)]Cl, 1 and [LCu(Br)(μ-Br)]2Br, 2, with a tridentate ligand of 3-((pyridin-2-ylmethyl)amino)propanamide, L, were prepared and characterized by physicochemical (elemental analyses, molar conductance measurements, thermogravimetry) and spectroscopic (IR, UV–vis) data. The crystal structures of compounds have been identified by single-crystal X-ray diffraction analyses and showed that the tridentate ligand L functions as an N2O-donor via the nitrogen atoms of the secondary amine and pyridyl moieties together with the oxygen atom of the amide group. The structural geometry about the copper(II) ions is a distorted square pyramid. The compounds are chromotropic and their reversible chromotropism was investigated by utilizing spectral analysis. The halochromism was due to structural change and followed by ionization of the coordinated water molecules and deprotonation of the secondary amine moiety. It was discovered that the solvatochromism of the compounds arisen from the structural change followed by the solvation of the vacant sites of the complexes. The compounds demonstrated ionochromism and sensitivity and selectivity towards CN and N3 anions in the presence of other pseudo-halide anions.

Graphic abstract



中文翻译:

含三齿配体的铜(II)配合物的结构和变色性质

摘要

[LCu(Cl)(μ-Cl)CuCl 3 ] [LCu(Cl)(μ-Cl)CuL(H 2 O)] Cl,1和[LCu(Br)(μ-Br)] 2的两种双核配合物制备了具有3(3-((吡啶-2-基甲基)氨基)丙酰胺三齿配体L的Br,2,并通过物理化学(元素分析,摩尔电导测量,热重分析)和光谱(IR,UV-vis)进行了表征数据。通过单晶X射线衍射分析鉴定了化合物的晶体结构,结果表明三齿配体L起N 2的作用。O-供体通过仲胺和吡啶基部分的氮原子与酰胺基团的氧原子一起形成。铜(II)离子的结构几何形状是扭曲的方形棱锥。该化合物具有变色性,并利用光谱分析研究了它们的可逆变色性。盐变色是由于结构变化,随后是配位水分子的电离和仲胺部分的去质子化。已经发现,化合物的溶剂变色现象是由结构变化引起的,随后是复合物的空位的溶剂化。化合物显示了离子变色和灵敏度和选择性向CN -和N 3 -在其他伪卤化物阴离子的存在阴离子。

图形摘要

更新日期:2020-06-02
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