A new series of fluorescent 5-methoxy-2-pyridylthiazoles with a pH-sensitive dual-emission
作者:Ming-Hua Zheng、Jing-Yi Jin、Wei Sun、Chun-Hua Yan
DOI:10.1039/b604910a
日期:——
A new series of fluorophores, 5-methoxy-2-(2-, 3- or 4-pyridyl)thiazoles (2-, 3- or 4-MPT, respectively), were synthesized and their photophysical properties investigated. 2- and 4-MPT are highly fluorescent in polar solvents. Combined with theoretical calculations, studies of the excited state lifetimes in different solvents reveal that their fluorescence mainly results from the internal charge transfer excited state. Acidobasic properties of their ground states and excited states were studied with steady and transient fluorescence spectroscopy. 2- and 4-MPT displayed a pH sensitive fluorescent behavior with a dual-emission in the range 2 to 6 in an aqueous system.
合成了一系列新的荧光团,5-美氧基-2-(2、3或4-吡啶基)噻唑(分别为2-MPT、3-MPT和4-MPT),并研究了它们的光物理性质。2-MPT和4-MPT在极性溶剂中具有高度荧光特性。结合理论计算,对不同溶剂中激发态寿命的研究表明,它们的荧光主要源自内部电荷转移激发态。通过静态和瞬态荧光光谱研究了它们基态和激发态的酸碱性质。2-MPT和4-MPT在水相系统中表现出pH敏感的荧光行为,在pH值2至6的范围内具有双重发射。