Omer Khalid M, Kanibolotsky Alexander L, Skabara Peter J, Perepichka Igor F, Bard Allen J
Center of Electrochemistry, Chemistry and Biochemistry Department, The University of Texas at Austin, Austin, Texas 78712, USA.
J Phys Chem B. 2007 Jun 21;111(24):6612-9. doi: 10.1021/jp070765u. Epub 2007 Apr 27.
We report electrochemical studies, spectroscopy, and electrogenerated chemiluminescence (ECL) of four monodisperse star-shaped truxene core-oligofluorene compounds (T1-T4). All oligomers produced stable radical anions and radical cations and showed blue ECL by ion annihilation with an intensity that could be seen with the naked eye. ECL spectra showed that all ECL emissions were at the same position as the fluorescence emission, except for T1, the compound with the shortest fluorene arms that produced some longer wavelength emission in addition to that seen in the fluorescence spectrum. When tetra-n-butylammonium oxalate was used as a coreactant for T1, the emission was much weaker than that in ion annihilation with the same long-wavelength emission observed, making it unlikely that this emission can be ascribed to excimer formation. The ECL intensity of T4 was about 80% of the common blue ECL emitter, 9,10-diphenylanthracene (DPA), under similar conditions.
我们报告了四种单分散星形连苯三酚核心-低聚芴化合物（T1-T4）的电化学研究、光谱学和电化学发光（ECL）情况。所有低聚物都产生了稳定的自由基阴离子和自由基阳离子，并通过离子湮灭显示出蓝色ECL，其强度肉眼可见。ECL光谱表明，除了T1之外，所有ECL发射都与荧光发射处于相同位置，T1是芴臂最短的化合物，除了荧光光谱中观察到的发射外，还产生了一些更长波长的发射。当草酸四正丁铵用作T1的共反应物时，发射比在离子湮灭中弱得多，且观察到相同的长波长发射，这使得这种发射不太可能归因于准分子形成。在类似条件下，T4的ECL强度约为常见蓝色ECL发射体9,10-二苯基蒽（DPA）的80%。
