"Petru Poni" Institute of Macromolecular Chemistry, 41A, Grigore Ghica Voda Alley, 700487 Iasi, Romania.
"Petru Poni" Institute of Macromolecular Chemistry, 41A, Grigore Ghica Voda Alley, 700487 Iasi, Romania.
Spectrochim Acta A Mol Biomol Spectrosc. 2019 May 15;215:371-380. doi: 10.1016/j.saa.2019.03.005. Epub 2019 Mar 4.
The sensitivity and selectivity properties of three phenylquinoxaline derivatives to different metal ions were investigated by absorption and fluorescence spectroscopy. The absorption and fluorescence responses of the phenylquinoxaline derivatives were examined towards the following metal ions Ag, Mg, Co, Ni, Cu, Zn, Cd and Hg, in THF solution. All investigated samples exhibit sensitivity and selectivity to Ag, Co and Cu ions compared to other metal ions (M = Mg, Ni, Zn, Cd and Hg). The gradual addition of Ag, Co and Cu ions to a Q-Ox sample solution generates new absorption bands (with maxima at 244, 675 and 294 nm, in presence of the Ag, Co and Cu ions, respectively) while the emission intensities were weakly quenched, except in presence of Ag ions, when the emission was almost completely quenched (quenching efficiency at 426 nm, (I - I) / I × 100% = 91%). Absorption and fluorescence results show the formation of 1:2 metal complexes with Ag ions and 1:1 stoichiometry for a complexation between Q-Ox and Co or Cu ions. The following characteristics of these phenylquinoxaline derivatives have been calculated and discussed: the effects of the interfering ions, the binding constants and the detection limit of Ag, Co and Cu ions.
通过吸收和荧光光谱法研究了三种苯并喹喔啉衍生物对不同金属离子的灵敏度和选择性。在 THF 溶液中，研究了苯并喹喔啉衍生物对以下金属离子 Ag、Mg、Co、Ni、Cu、Zn、Cd 和 Hg 的吸收和荧光响应。与其他金属离子（M=Mg、Ni、Zn、Cd 和 Hg）相比，所有研究的样品对 Ag、Co 和 Cu 离子均表现出灵敏度和选择性。将 Ag、Co 和 Cu 离子逐渐加入 Q-Ox 样品溶液中，会生成新的吸收带（在存在 Ag、Co 和 Cu 离子时，最大吸收分别位于 244、675 和 294nm 处），同时荧光强度被弱猝灭，除了存在 Ag 离子时，荧光几乎完全猝灭（在 426nm 处的猝灭效率，（I-I）/I×100%=91%）。吸收和荧光结果表明，Ag 离子与 Q-Ox 形成 1:2 的金属配合物，而 Q-Ox 与 Co 或 Cu 离子以 1:1 的化学计量比形成配合物。计算并讨论了这些苯并喹喔啉衍生物的以下特性：干扰离子的影响、结合常数和 Ag、Co 和 Cu 离子的检测限。
