pH responsive luminescent switches of ruthenium(II) complexes containing two imidazole groups: Synthesis, spectroscopy, electrochemistry and theoretical calculations
pH responsive luminescent switches of ruthenium(II) complexes containing two imidazole groups: Synthesis, spectroscopy, electrochemistry and theoretical calculations
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含有两个咪唑基团的钌(II)配合物的pH响应发光开关：合成、光谱、电化学和理论计算
DOI：
10.1016/j.ica.2009.07.034
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发表时间：
2009-11-10
影响因子：
2.8
通讯作者：
Ji, Liang-Nian
中科院分区：
文献类型：
--
作者：
Gao, Feng;Chen, Xing;Ji, Liang-Nian
合成了一系列新的含两个咪唑基的单核多吡啶钌（II）配合物，并通过H-1 NMR，ES-MS，FAB-MS，IR和元素分析进行了表征。采用实验和理论计算相结合的方法研究了它们的电化学和光谱性质，包括紫外-可见吸收、稳态和时间分辨发射。这些配合物已被发现是敏感的发光pH开关，因为它们的吸收和发射光谱响应的溶液的pH值异常灵敏的干扰，通过质子化和去质子化的咪唑基团。DFT计算揭示了质子化和去质子化的确切途径。还根据不同pH下的吸光度和发射数据计算了每个酸碱平衡的基态和激发态电离常数（pK（a）和pK（a）*）。（c）2009 Elsevier B. V.版权所有。
A series of new mononuclear polypyridyl ruthenium(II) complexes containing two imidazole groups have been synthesized and characterized by H-1 NMR, ES-MS, FAB-MS, IR spectra and elemental analysis. Their electrochemistry and spectroscopic properties including UV-Vis absorption, steady-state and time-resolved emission have been studied using both experimental methods and theoretical calculations. These complexes have been found to be sensitive luminescent pH switches, as their absorption and emission spectra respond to the solutions pH disturbances with extraordinary sensitivity, through the protonation and deprotonation of the imidazole groups. DFT calculations have been carried out to reveal the exact protonation and deprotonation route. The ground-state and excited-state ionization constants (pK(a) and pK(a)*) of each acid-base equilibrium have also been calculated according to the absorbance and emission data under different pH. (c) 2009 Elsevier B.V. All rights reserved.