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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Photophysical properties of a D-pi-A Schiff base and its applications in the detection of metal ions
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Photophysical properties of a D-pi-A Schiff base and its applications in the detection of metal ions

机译：一种D-PI-A Schiff基底的光物理性质及其在金属离子检测中的应用

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摘要

A D-pi-A Schiff-base compound, 2-amino-3({[4-(diethylamino)-2-hydroxylphenyl]methylene}amino)-but-2-enedinitrile (H2L), was prepared using diaminomaleonitrile and 4-(N,N-diethylamino)salicylaldehyde. Compared with H2L at 293 K, a low temperature of 100 K makes the parallel aromatics in H2L come closer and fluorescence emission becomes weaker because of pi-pi interaction-caused quenching. After grinding the crystals of H2L, the colour changed from dark brown-red to yellow under room light and the fluorescence emission enhanced about 9-fold due to the damage of the intermolecular hydrogen bonds, leading to a decrease of non-radiative transition. H2L showed aggregation-induced emission enhancement (AIEE) characteristics in THF/H2O, whose mechanism is attributed to the restriction of intramolecular rotation (RIR). The UV-Vis spectra of H2L with Cu2+ in THF/H2O showed that at first a CuL complex was formed and subsequently a CuL complex (H2L = N',N'-bis(4-N',N-diethylsalicylidene) ethylenediamine) was obtained. The CuL complex turned into the CuL complex as time prolonged. H2L acted as a dual channel chemosensor for Cu2+ ions in THF/HEPES (v/v: 2:8, pH = 8.0) and the CuL complex was stable in this medium. H2L is also a naked-eye probe for Mn2+ ions in CH3CN. The limits of detection are much lower than the allowable level of copper(ii) and manganese(ii) in drinking water set by the World Health Organization (WHO).
机译：使用二氨基甲腈和4--二氨基-3（{[4-（二乙基氨基）-2-羟基苯基]亚甲基}氨基）-BOT-2-丁腈（H2L），制备D-PI-3（{[4-（二乙基氨基）-2-羟基苯基]亚甲基}氨基）。 （N，N-二乙基氨基）水杨醛。与293 k处的H 2L相比，低温为100k，使H2L的平行芳烃更近，由于PI-PI相互作用导致淬火，荧光发射变弱。在研磨H2L的晶体之后，由于分子间氢键的损伤，从室内光线下的彩虹红色变为黄色，荧光发射增加约9倍，导致非辐射过渡的降低。 H2L在THF / H 2 O中显示出聚集诱导的发射增强（AIEE）特征，其机制归因于分子内旋转的限制（RIR）。在THF / H 2 O中具有Cu2 +的H2L的UV-VIS光谱显示，在第一，形成CUL络合物，随后是CUL络合物（H2L = N'，N'-BIS（4-N'，N-二乙基亚二甲基）乙二胺）是获得。 CUL综合体随着时间的推移转变为CUL综合体。 H2L作为THF / HEPES中的Cu2 +离子的双通道化学传感器（v / v：2：8，pH = 8.0），并且CUL络合物在该培养基中稳定。 H2L也是CH3CN中的MN2 +离子的裸眼探针。检测的极限远低于世界卫生组织（世卫组织）饮用水中的铜（II）和锰（II）的允许水平。

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    Kang Yang; Liao Zhuang; Wu Min; Li Sai; Fang De-Cai; Zheng Xiang-Jun; Jin Lin-Pei;

  • 作者单位

    Beijing Normal Univ Coll Chem Beijing Key Lab Energy Convers &

    Storage Mat Beijing 100875 Peoples R China;

    Beijing Normal Univ Coll Chem Beijing Key Lab Energy Convers &

    Storage Mat Beijing 100875 Peoples R China;

    Beijing Normal Univ Coll Chem Beijing Key Lab Energy Convers &

    Storage Mat Beijing 100875 Peoples R China;

    Beijing Normal Univ Coll Chem Beijing Key Lab Energy Convers &

    Storage Mat Beijing 100875 Peoples R China;

    Beijing Normal Univ Coll Chem Beijing Key Lab Energy Convers &

    Storage Mat Beijing 100875 Peoples R China;

    Beijing Normal Univ Coll Chem Beijing Key Lab Energy Convers &

    Storage Mat Beijing 100875 Peoples R China;

    Beijing Normal Univ Coll Chem Beijing Key Lab Energy Convers &

    Storage Mat Beijing 100875 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;无机化学;
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