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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A cationic tetrahedral Zn(ii) cluster based on a new salicylamide imine multidentate ligand: synthesis, structure and fluorescence sensing study
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A cationic tetrahedral Zn(ii) cluster based on a new salicylamide imine multidentate ligand: synthesis, structure and fluorescence sensing study

机译：基于新的水杨酰胺酰亚胺多夜配体的阳离子四面体Zn（II）簇：合成，结构和荧光传感研究

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摘要

A monocationic Zn-II tetrahedral cluster, [Zn4L3(mu(3)-OH)]center dot NO3 center dot 1.25H(2)O (Zn4L3) based on a new salicylamide imine ligand H2L, H2L = 1-(2-hydroxy-3-methoxy-benzamido)-3-(2-hydroxy-3-methoxy-benzylideneamino)-propane, has been prepared. Single crystal X-ray analysis reveals that three deprotonated ligands L2- chelate three Zn(ii) centres with their salicylamide moiety in such a way that the three salicylimine groups attached to the other side of the three chelates are converged to bind another Zn(ii) centre to provide a tetrahedral cluster with two phenyl groups of the same ligand L2- being close enough to present a strong intramolecular pi MIDLINE HORIZONTAL ELLIPSIS pi stacking effect. Fluorescence studies indicate that Zn4L3 is stable in water and exhibits highly sensitive and selective recognition of phosphates against other common anions including CO32-, HCO3-, NO3-, F-, Cl-, Br-, I-, HSO4-, SO42-, OAc-, BF4-, ClO4- and CF3SO3- in HEPES buffer solution (pH = 7.4) + DMSO (V : V = 1 : 9). The excellent sensing capability of Zn4L3 for phosphate against other common anions with a low detection limit of 0.15 mu M renders it a candidate probe for phosphate detection. Furthermore, the observed fluorescence quenching responses of Zn4L3 towards phosphates were highly reversible. The possible sensing mechanisms for phosphate detection by Zn4L3 was investigated by means of H-1 NMR, UV-Vis spectra and high-resolution ESI-MS spectra and the results indicate that phosphates could exclusively decompose Zn4L3 to release H2L in HEPES buffer solution (pH = 7.4) + DMSO (V : V = 1 : 9).
机译：基于新的水杨酸亚胺配体H2L，H 2L = 1-（2-羟基，[Zn4L3（MU（3）-OH）]中心点NO3中心点1.25H（2）O（Zn4L3）中央点NO3中心点1.25H（2）O（Zn4L3），H2L = 1-（2-羟基已经制备-3-甲氧基 - 苯甲酰氨基）-3-（2-羟基-3-甲氧基 - 苄基氨基） - 丙烷已制备。单晶X射线分析表明，三种去质子化配体L2 - 螯合三种Zn（II）中心以它们的水杨酰胺部分，使得连接到三个螯合物的另一侧的三个水杨酰胺基团被收敛以结合另一个Zn（II ）中心提供四面体簇，其具有相同配体L2的两个苯基 - 足够接近，以呈现强烈的分子内Pi中线水平椭圆型Pi堆叠效果。荧光研究表明，Zn4L3在水中稳定，并且对其他常见阴离子表现出高度敏感和选择性识别，包括CO32-，HCO3，NO 3，F-，Cl-，BR-，I-，HSO4-，SO42-， Hepes缓冲溶液（pH = 7.4）+ DMSO（V：V = 1：9）中的OAC-，BF4-，CLO 4和CF 3 SO 3-。 Zn4L3对磷酸盐磷酸盐的优异感测能力，其具有低检测极限为0.15μm的常见阴离子，使其使其成为磷酸盐检测的候选探针。此外，观察到Zn4L3对磷酸盐的荧光猝灭反应是高度可逆的。通过H-1 NMR，UV-Vis光谱和高分辨率ESI-MS光谱研究了通过Zn4L3磷酸盐检测的可能感测机制，结果表明磷酸盐可以专门将Zn4L3分解为Hepes缓冲溶液中的H2L（pH值） = 7.4）+ DMSO（V：v = 1：9）。

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