An NBD-armed thiacalix[4]arene-derived colorimetric and fluorometric chemosensor for Ag+: a metal-ligand receptor of anions.
An NBD-armed thiacalix[4]arene-derived colorimetric and fluorometric chemosensor for Ag+: a metal-ligand receptor of anions.
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DOI：
10.1039/c2dt32115g
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发表时间：
2013-02
影响因子：
4
通讯作者：
Yung-Chien Fu;Lan Mu;Xi Zeng;Jiang-Lin Zhao;C. Redshaw;Xin‐Long Ni;T. Yamato
中科院分区：
文献类型：
--
作者：
Yung-Chien Fu;Lan Mu;Xi Zeng;Jiang-Lin Zhao;C. Redshaw;Xin‐Long Ni;T. Yamato
合成了一种以氨基为结合位点，7-硝基苯并-2-氧-1,3-二唑（NBD）为发色团的新型噻吩类[4]芳烃化学传感器2a和2b，并用单晶x射线衍射和核磁共振方法对其进行了表征。每种受体都是银离子的强比色和荧光传感器，并且在加入Ag（+）阳离子后，在紫外-可见吸收和荧光发射光谱中都出现了显色位移，从而表现出显著的nh3的逐步去质子化。此外，金属配体配合物2a·Ag（+）可以作为离子对受体，通过切换检测信号输出来识别F（-）、AcO（-）或I（-）阴离子（可通过“肉眼”识别）。而受体2b·Ag（+）仅对碘离子表现出选择性反应。这些结果可能是由于受体2a和2b之间的结构构象略有不同，它们来自1,3-交替噻吩基[4]芳烃支架，表明它们在宿主化学传感器的选择和结合能力中起关键作用。
A new type of thiacalix[4]arene-based chemosensor 2a and 2b containing amino groups as a binding site and 7-nitrobenzo-2-oxa-1,3-diazole (NBD) as a chromophore have been synthesized and characterized by single crystal X-ray diffraction and by NMR spectroscopic methods. Each receptor acted as a strong colorimetric and fluorometric sensor for silver ions and exhibited significant stepwise deprotonation of NH as evidenced by a bathochromic shift in both the UV-vis absorption and fluorescence emission spectra after addition of an Ag(+) cation. Furthermore, the metal-ligand complex 2a·Ag(+) can be exploited as an ion-pair receptor for the recognition of F(-), AcO(-) or I(-) anions through switching the detection signal output (can been distinguished by 'naked eye'). However, receptor 2b·Ag(+) displays a selective response only to iodide ion. These results could be attributed to the slightly different structural conformation between receptors 2a and 2b, which are derived from a 1,3-alternate-thiacalix[4]arene scaffold, suggesting they play a key role in the selective and binding ability of the host chemosensors.