Colorimetric anion sensors based on positional effect of nitro group for recognition of biologically relevant anions in organic and aqueous medium, insight real-life application and DFT studies
作者:Archana Singh、Suban K. Sahoo、Darshak R. Trivedi
DOI:10.1016/j.saa.2017.07.051
日期:2018.1
towards F- and AcO- ions in DMSO. Due to presences of the NO2 group at para and ortho position with extended π-conjugation of naphthyl group carrying OH as a binding site. Compared to receptor A2, A1 is extremely capable of detecting F- and AcO- ions present in the form of sodium salts in an aqueous medium. This is owed to the occurrence of NO2 group at para position induced in increasing the acidity of OH
设计并合成了新的六种比色受体A1-A6,并通过典型的常用光谱技术进行表征,例如FT-IR,UV-Visible,1H NMR,13C NMR和ESI-MS。受体A1和A2对DMSO中的F-和AcO-离子表现出明显的肉眼反应。由于在对位和邻位存在NO 2基团,带有携带OH作为结合位点的萘基的π偶联扩展。与受体A2相比,A1极有能力检测在水性介质中以钠盐形式存在的F-和AcO-离子。这归因于在增加OH质子的酸度中引起的对位的NO 2基团的出现。因此,它很容易在水性介质中去质子化。事实证明,对于F-和AcO-离子,受体A1的检出限为0.40和0.35ppm,低于WHO许可水平(1。0ppm)。受体A1在存在AcO离子的情况下,在不同的非质子传递溶剂中表现出溶剂致变色的孤立性质。受体A1对DMSO:HEPES缓冲液(9:1,v / v)中的AcO-离子具有很高的选择性。受体A1通过检测溶液和固态阴离子证明了其在现实生活中的应用。通过1