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合成了萘基臂式苯并氮杂15-冠-5(3)和5-氯喹啉基臂式苯并氮杂15-冠-5(4)两种荧光化学传感器,由元素分析、NMR等进行了结构表征;在乙醇溶剂中采用紫外光谱和荧光光谱法分别研究了冠醚3和4对金属离子K+,Ca2+,Mg2+,Pb2+,Co2+,Ni2+,Mn2+,Cu2+,Zn2+,Cd2+和Hg2+的选择性传感性能.结果表明,冠醚3仅对Cu2+离子有显著的传感作用,是一种典型的辐射能量转移过程.冠醚4对Ni2+,Co2+,Cu2+和Mn2+离子有特殊的敏感性,金属离子浓度逐渐增大使冠醚4产生先增强后猝灭的荧光现象,荧光增强归因于阻断了从冠环氮原子到喹啉荧光体的弱光诱导电子转移(PET)过程,而选择性猝灭源于冠醚环与喹啉基团对金属离子协同螯合的机制.冠醚3和4的构性关系表明,发光体基团对传感器的选择性能够产生重要的影响.
Two kinds of fluorescence chemosensors based on naphthalene arm benzazepin 15-crown-5 (3) and 5-chloroquinolyl arm benzazepin 15-crown-5 (4) were synthesized and characterized by elemental analysis The structures of crown ethers 3 and 4 for K +, Ca2 +, Mg2 +, Pb2 +, Co2 +, Ni2 +, Mn2 +, Cu2 +, Zn2 +, Cd2 + and Hg2 + were studied by UV spectroscopy and fluorescence spectroscopy respectively in ethanol solvent. The results show that crown ether 3 is a typical radiation energy transfer process only for Cu2 + ions.The crown ether 4 has special sensitivity to Ni2 +, Co2 +, Cu2 + and Mn2 + ions, The concentration of metal ions gradually increased to make the crown ether 4 firstly enhance and then quench. The enhancement of fluorescence was attributed to the blocking of weak light-induced electron transfer (PET) from the nitrogen of the crown ring to the quinophosphor, Sexual quenching results from the synergistic chelation mechanism between crown ether and quinoline groups for metal ions.The structural relationship between crown ethers 3 and 4 shows that the luminophore group can have a significant effect on the selectivity of the sensor.