Fluorometric sensing of Hg2+ ions in aqueous medium by nano-aggregates of a tripodal receptor
作者:Ajnesh Singh、Simanpreet Kaur、Narinder Singh、Navneet Kaur
DOI:10.1039/c3ob42200c
日期:——
Two new tripodal receptors (1–2) have been synthesized and characterized by various spectroscopic techniques. The nano-aggregates of 1 and 2 (N1 and N2) have been prepared by a re-precipitation method in aqueous medium and have shown different photo-physical properties. Nano-aggregates of 1 (N1) can selectively recognize Hg2+ in aqueous medium in the presence of other metal ions with enhancement in fluorescent intensity. The response was linearly proportional to the concentration of Hg2+ in the range 0–10 μM with a detection limit of 2.4 nM. The mechanism of selective binding of Hg2+ by N1 has also been supported by theoretical studies. To the best of our knowledge, this work represents the first report on substituted thiourea based nano-aggregates for nano-molar detection of mercury in aqueous medium.
合成并表征了两种新的三足受体(1-2),采用了多种光谱技术。通过在水相中重沉淀法制备了1和2的纳米聚集体(N1和N2),并显示出不同的光物理特性。1的纳米聚集体(N1)能够在存在其他金属离子的情况下选择性识别水相中的Hg2+,并增强荧光强度。该响应与0-10 μM范围内Hg2+的浓度成线性比例关系,检测限为2.4 nM。理论研究也支持了N1对Hg2+选择性结合的机制。根据我们所知,这项工作是基于取代硫脲的纳米聚集体在水相中进行纳摩尔级汞检测的首次报道。