Comparative Studies of Multi-Photon Induced Emission by Pyridine-Based Small Molecular Probes in Biological Media: Selective Binding of Bioactive Molecules and In Vitro Imaging
作者:Wanqing Wu、Hoi-Kuan Kong、Hongguang Li、Yu-Man Ho、Yuan Gao、Jianhua Hao、Margaret B. Murphy、Michael Hon-Wah Lam、Ka-Leung Wong、Chi-Sing Lee
DOI:10.1002/ejoc.201100570
日期:2011.9
in the fluorescence spectra of all these molecular probes; in acidic medium (pH = 4–5) their fluorescence emissions are slightly blueshifted with a threefold enhancement in intensity relative to those observed under basic conditions (pH = 10–11). In the fluorometric titration study against a variety of bioactive small molecules, only 2 shows strong binding affinity (log KB > 7) towards citrates and
已开发出一类基于 1,3-二取代二乙炔苯核的新型有机分子探针 (1-3)。1 和 2(1 的酯被 2 中的二乙酰胺取代)显示出良好的线性和三光子诱导光物理特性,双光子吸收截面(185-210 cm4 s 光子-1 分子-1)适合用于活体标本的生物学应用。3 的螺旋桨 π 共轭系统(1 的 C3 类似物)显示双光子吸收截面(650 cm4 s 光子-1 分子-1)的三倍增强。所有这些分子探针的荧光光谱均观察到溶剂致变色现象;在酸性介质 (pH = 4–5) 中,它们的荧光发射略微蓝移,强度相对于在碱性条件 (pH = 10–11) 下观察到的强度增加了三倍。在针对各种生物活性小分子的荧光滴定研究中,只有 2 个对柠檬酸盐和碳酸氢盐显示出强结合亲和力(log KB > 7),红移约为 30 nm。获得的 2 的体外发射光谱在向溶液中加入阴离子后显示出相同的发射。这些研究的结果可以为双光吸收 (TPA)