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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Complexes of Zn(II) containing (o-)/(p-) carboxylato phenyl azo pentane 2,4-dione and 2,2′ bipyridine as ligands: Synthesis, characterization, colorimetric and fluorometric modulation in the presence of Ag~+ ions
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Complexes of Zn(II) containing (o-)/(p-) carboxylato phenyl azo pentane 2,4-dione and 2,2′ bipyridine as ligands: Synthesis, characterization, colorimetric and fluorometric modulation in the presence of Ag~+ ions

机译:含(o-)/(p-)羧基苯基苯基偶氮戊烷2,4-二酮和2,2'联吡啶作为配体的Zn(II)配合物:在Ag〜+离子存在下的合成,表征,比色和荧光调制

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摘要

Azo-enol based ligands 2-[N′-(1-acetyl-2-oxo-propylidene) hydrazino]-benzoic acid (L_1H_2) and 4-[N′-(1 acetyl-2 oxo-propylidene)-hydrazino]-benzoic acid (L_2H_2) and their complexes [Zn(L_1H)_2(bpy)] (1) and [Zn(L _2H)_2(bpy)] (2) (where bpy = 2, 2′-bipyridine) have been synthesized and characterized using elemental analyses, spectral (FT-IR, 1H NMR, ~(13)C NMR, electronic absorption), emission and single-crystal X-ray diffraction studies. Complexes 1 and 2 display selective chromogenic and fluorogenic responses with Ag~+ ions in the presence of several other metal ions. The binding is monitored separately using UV-Vis, fluorescence and ~1H NMR spectral titrations. Job's plot supports a 1:2 stoichiometry for 1 and 2 with Ag~+ ions. The pH dependent "on-off" switching of fluorescence from complexes 1 and 2 have been studied. The fluorescence intensity quenches (turns-off) upon addition of OH~- ions, while it enhances (turns-on) in the presence of H ~+ ions.
机译:基于偶氮烯醇的配体2- [N'-(1-乙酰基-2-氧代亚丙基)肼基]-苯甲酸(L_1H_2)和4- [N'-(1乙酰基-2-氧代亚丙基)肼基]-已合成苯甲酸(L_2H_2)及其配合物[Zn(L_1H)_2(bpy)](1)和[Zn(L _2H)_2(bpy)](2)(其中bpy = 2,2'-联吡啶)并使用元素分析,光谱(FT-IR,1H NMR,〜(13)C NMR,电子吸收),发射和单晶X射线衍射研究表征。配合物1和2在几种其他金属离子的存在下,对Ag〜+离子表现出选择性的生色和荧光反应。使用UV-Vis,荧光和〜1H NMR光谱滴定分别监测结合。乔布的图支持Ag〜+离子对1和2的化学计量比为1:2。已经研究了复合物1和2的pH依赖性“开-关”荧光转换。加入OH〜-离子后,荧光强度猝灭(熄灭),而在存在H〜+离子时,荧光强度增强(点亮)。

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