Effect of the Electron Donor/Acceptor Orientation on the Fluorescence Transduction Efficiency of the d-PET Effect of Carbazole-Based Fluorescent Boronic Acid Sensors
作者:Xin Zhang、Yubo Wu、Shaomin Ji、Huimin Guo、Peng Song、Keli Han、Wenting Wu、Wanhua Wu、Tony D. James、Jianzhang Zhao
DOI:10.1021/jo100119y
日期:2010.4.16
and 3 are d-PET sensors (fluorophore as the electron donor, supported by DFT/TDDFT calculations), which show diminished emission at acidic pH but intensified emission at neutral/basic pH, which is in stark contrast to the normal a-PET (fluorophore as the electron acceptor) sensors, e.g., 2, which shows intensified emission at acidic pH but diminished emission at neutral pH. The fluorescence modulation
我们已经合成了三种基于咔唑的新型荧光硼酸传感器,以研究新型d-PET效应的荧光转导效率,其中荧光团充当电子给体,质子化胺/硼酸基团充当光致电子的电子受体电子转移过程(PET)。芳基乙炔基连接在咔唑的3,6-位(对于传感器1,芳基= 4-二甲基氨基苯基,对于传感器2,苯基)。传感器3没有3,6-取代。在这些传感器中,苯基硼酸部分连接在咔唑的9位(N原子)处。我们发现1和3是d-PET传感器(荧光团作为电子d onor,通过DFT / TDDFT计算)的支持,其显示在酸性pH在中性/碱性pH降低的排放,但加剧发射,这是在形成鲜明对比的正常的A-PET(荧光团作为电子一cceptor)传感器,例如,2个,在酸性pH值下显示出增强的发射,而在中性pH值下显示减小的发射。新传感器的d-PET效果的荧光调制效率,即从酸性pH切换到中性pH时的发射强度增强高达10倍,与我们以前的d-PET传感器相比,有