Department of Chemistry, Faculty of Sciences, Karadeniz Technical University, 61080, Trabzon, Turkey.
J Fluoresc. 2017 Sep;27(5):1759-1766. doi: 10.1007/s10895-017-2114-2. Epub 2017 May 23.
Four fluorescent Schiff bases carrying dipicolylamine groups were designed and synthesized to determine their ion sensor properties in partial aqueous solution. The corresponding amine compound and the aldehyde compounds such as 1-naphthaldehyde, 9-anthraldehyde, phenanthrene-9-carboxaldehyde and 1-pyrenecarboxaldehyde were used to prepare the new Schiff bases. The influence of many metal cations and anions on the spectroscopic properties of the ligands was investigated in ethanol-water (1:1) by means of emission spectrometry. From the spectrofluorimetric titrations, the complexation stoichiometry and complex stability constants of the ligands with Cd, Zn, Cu and Hg ions were determined. The ligands did not interact with the anions. However, the Schiff base derived from phenanthrene-9-carboxaldehyde showed sensitivity for Cu among the tested metal ions. The phenanthrene-based Schiff base was used as analytical ligand for the simple and fast determination of Cu ion in water samples. A modified standard addition method was used to eliminate matrix effect. The linear range was from 0.3 mg/L to 3.8 μg/L. Detection and quantification limits were 0.14 and 0.43 mg/L, respectively. Maximum contaminant level goal (MCLG) for copper in drinking water according to EPA is 1.3 mg/L. The proposed method has high sensitivity to determine copper in drinking waters.
设计并合成了四个带有二吡啶胺基团的荧光席夫碱，以确定它们在部分水相中作为离子传感器的性能。使用相应的胺化合物和醛化合物，如 1-萘醛、9-蒽醛、菲-9-羧醛和 1-并苯甲酰醛，制备了新的席夫碱。通过发射光谱法在乙醇-水（1:1）中研究了许多金属阳离子和阴离子对配体光谱性质的影响。通过荧光滴定法，确定了配体与 Cd、Zn、Cu 和 Hg 离子的络合化学计量比和络合稳定常数。配体与阴离子不相互作用。然而，在测试的金属离子中，来源于菲-9-羧醛的席夫碱对 Cu 表现出敏感性。基于菲的席夫碱被用作分析配体，用于水样中 Cu 离子的简单快速测定。采用改进的标准加入法消除基体效应。线性范围为 0.3mg/L 至 3.8μg/L。检测限和定量限分别为 0.14 和 0.43mg/L。根据 EPA，饮用水中铜的最大污染物水平目标 (MCLG) 为 1.3mg/L。该方法对饮用水中铜的测定具有很高的灵敏度。
