作者:Stefan Kappaun、Tanja Sović、Franz Stelzer、Alexander Pogantsch、Egbert Zojer、Christian Slugovc
DOI:10.1039/b600912c
日期:——
Three 5,7-π-extended 8-benzyloxyquinolines, namely 5,7-diphenyl-, 5,7-bis(biphenyl-4-yl)- and 5,7-bis(4-dibenzothiophenyl)-8-benzyloxyquinoline were prepared and investigated as fluorescent pH-probes in nonaqueous solution. Absorption and photoluminescence spectra of the introduced compounds also including the starting material 8-benzyloxy-5,7-dibromoquinoline as well as their N-protonated counterparts were recorded and the results were rationalized by quantum-chemical calculations. A pronounced red shift of the emission occurred upon protonation of the non halogenated derivatives, while the dibromo-derivative is hardly emissive and is virtually not protonated under the conditions used. The diphenyl- and the bis(biphenyl)-derivative especially show promising photoluminescence quantum yields both in the parent and the protonated state making them candidates for the active component in pH sensing applications.
制备并研究了三种 5,7-π 延伸的 8-苄氧基喹啉,即 5,7-二苯基、5,7-双(联苯-4-基)和 5,7-双(4-二苯并噻吩基)-8-苄氧基喹啉,作为非水溶液中的荧光 pH 探针。研究人员记录了所引入化合物(也包括起始材料 8-苄氧基-5,7-二溴喹啉)及其 N-质子化对应物的吸收光谱和光致发光光谱,并通过量子化学计算对结果进行了合理解释。非卤代衍生物质子化时,发射发生了明显的红移,而二溴衍生物几乎不发射,在所用条件下几乎不质子化。尤其是二苯基和双(联苯)衍生物在母体和质子化状态下都显示出良好的光致发光量子产率,使它们成为 pH 值传感应用中的候选活性成分。