REQUIMTE, Department of Chemistry, FCT-UNL, 2829-516 Monte de Caparica, Portugal.
Inorg Chem. 2010 Dec 6;49(23):10847-57. doi: 10.1021/ic101095y. Epub 2010 Nov 4.
Three new compounds bearing furyl, aryl, or thienyl moieties linked to an imidazo-crown ether system (1, 2, and 3) were synthesized and fully characterized by elemental analysis, infrared, UV-vis absorption, and emission spectroscopy, X-ray crystal diffraction, and MALDI-TOF-MS spectrometry. The interaction toward metal ions (Ca(2+), Cu(2+), Ni(2+), and Hg(2+)) and F(-) has been explored in solution by absorption and fluorescence spectroscopy. Mononuclear and binuclear metal complexes using Cu(2+) or Hg(2+) as metal centers have been synthesized and characterized. Compounds 2 and 3 show a noticeable enhancement of the fluorescence intensity in the presence of Ca(2+) and Cu(2+) ions. Moreover compound 3 presents a dual sensory detection way by modification of the fluorimetric and colorimetric properties in the presence of Cu(2+) or Hg(2+). EPR studies in frozen solution and in microcrystalline state of the dinuclear Cu(II)3 complex revealed the presence of an unique Cu(2+) type.
三种新型化合物含有呋喃基、芳基或噻吩基部分，与咪唑-冠醚系统相连（1、2 和 3），通过元素分析、红外、紫外可见吸收和发射光谱、X 射线晶体衍射和 MALDI-TOF-MS 光谱法进行了全面的表征。通过吸收和荧光光谱法在溶液中探索了对金属离子（Ca(2+)、Cu(2+)、Ni(2+)和 Hg(2+)）和 F(-)的相互作用。使用 Cu(2+)或 Hg(2+)作为金属中心的单核和双核金属配合物已被合成和表征。化合物 2 和 3 在存在 Ca(2+)和 Cu(2+)离子时显示出荧光强度的明显增强。此外，化合物 3 通过在存在 Cu(2+)或 Hg(2+)时修饰荧光和比色性质呈现出双重传感检测方式。在冷冻溶液和双核 Cu(II)3 配合物的微晶状态下的 EPR 研究表明存在一种独特的 Cu(2+)类型。
