Naimhwaka Johannes, Uahengo Veikko
Department of Chemistry and Biochemistry, University of Namibia 340 Mandume Ndemufayo Avenue Windhoek 9000 Namibia
RSC Adv. 2019 Nov 21;9(65):37926-37938. doi: 10.1039/c9ra06116a. eCollection 2019 Nov 19.
A naphthoquinone based colorimetric sensor (N) bearing hydrazone receptors in aqueous media was developed and its recognition properties towards biologically important anions in DMSO-water mixture (9 : 1) were investigated using spectroscopic methods. The hydrazone based receptors showed selectivity towards anions (F, OH, CN and AcO), through naked eye observable colour changes, from green to light blue (F, CN and AcO) and violet (OH). The colour changes were concomitant with spectral changes. The sensor could also detect the presence of fluoride ions in commercially available toothpastes, through remarkable colour and spectral changes. In addition, test paper strips prepared from N were able to detect the presence of cyanide (KCN) and hydroxide (NaOH) in tap water. The study was complimented by density functional theory computations to have more insight in the interaction between N and the anions.
开发了一种在水介质中带有腙受体的基于萘醌的比色传感器（N），并使用光谱方法研究了其在二甲基亚砜 - 水混合物（9∶1）中对生物重要阴离子的识别特性。基于腙的受体通过肉眼可观察到的颜色变化，表现出对阴离子（F⁻、OH⁻、CN⁻和AcO⁻）的选择性，颜色从绿色变为浅蓝色（F⁻、CN⁻和AcO⁻）以及紫色（OH⁻）。颜色变化伴随着光谱变化。该传感器还能够通过显著的颜色和光谱变化检测市售牙膏中氟离子的存在。此外，由N制备的试纸条能够检测自来水中氰化物（KCN）和氢氧化物（NaOH）的存在。通过密度泛函理论计算对该研究进行了补充，以便更深入地了解N与阴离子之间的相互作用。
