Two luminescent transition-metal–organic frameworks with a predesigned ligand as highly sensitive and selective iron(iii) sensors†,New Journal of Chemistry

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Two luminescent transition-metal–organic frameworks with a predesigned ligand as highly sensitive and selective iron(iii) sensors†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-03-15 00:00:00 , DOI: 10.1039/c8nj00656c
Jian Zhang _{1,

2,

3,

4} , Lili Zhao _{1,

2,

3,

4} , Yinxia Liu _{1,

2,

3,

4} , Mingyue Li _{1,

2,

3,

4} , Gang Li _{1,

2,

3,

4} , Xiangru Meng _{1,

2,

3,

4}

Affiliation

To obtain new structural MOFs with the desired properties, a multifunctional organic ligand, 2-(4-cyanophenyl)-1H-imidazole-4,5-dicarboxylic acid (p-CNPhH₃IDC) has been designed and prepared. The optimized geometry and natural bond orbital (NBO) charge distributions of the free p-CNPhH₃IDC ligand have been calculated by the theoretical method. Its strong coordination ability was confirmed by experimental results. In addition, two new metal–organic frameworks [Cd(p-CNPhHIDC)(4,4′-bipy)_0.5]_n (1) and [Zn(p-CNPhHIDC)(4,4′-bipy)]_n (2) (4,4′-bipy = 4,4′-bipyridine), have been hydro(solvo)thermally synthesized and structurally characterized by elemental analysis, infrared spectroscopy, powder X-ray diffraction and single crystal X-ray diffraction. Their chemical-stable, thermal and solid-state photoluminescent properties have been investigated. Luminescence studies reveal that both the complexes not only can highly selectively sense the Fe³⁺ ion through fluorescence quenching but also resist interference from other metals. More importantly, the response time is very fast. This suggests that the possible sensing mechanism is the competitive absorption of excitation energy.

中文翻译：

具有预先设计的配体的两个发光过渡金属-有机框架，作为高度敏感和选择性的铁（iii）传感器†

为了获得具有所需性能的新型结构MOF，已设计并制备了多功能有机配体2-（4-氰基苯基）-1 H-咪唑-4,5-二羧酸（p -CNPhH ₃ IDC）。通过理论方法计算了游离p -CNPhH ₃ IDC配体的最佳几何形状和自然键轨道（NBO）电荷分布。实验结果证实了其较强的配位能力。此外，两个新的金属有机框架[Cd（p -CNPhHIDC）（4,4'-bipy）_0.5 ] _n（1）和[Zn（p -CNPhHIDC）（4,4'-bipy）] _n（2）（4,4'-bipy = 4,4'-bipyridine），已被水（溶剂）热合成，并通过元素分析，红外光谱，粉末X射线衍射和单晶X射线衍射对其结构进行了表征。已经研究了它们的化学稳定，热和固态光致发光性能。发光研究表明，这两种配合物不仅可以通过荧光猝灭来高度选择性地感测Fe ³⁺离子，而且还可以抵抗其他金属的干扰。更重要的是，响应时间非常快。这表明可能的传感机制是竞争性吸收激发能。

更新日期：2018-03-15

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