作者:Tadatake Sato、Kiyotaka Hori、Mamoru Fujitsuka、Akira Watanabe、Osamu Ito、Kazuyoshi Tanaka
DOI:10.1039/a802514b
日期:——
The synthesis of three kinds of bis(2,2â²-bithiophene-5-yl)benzenes (1,2-, 1,3- and 1,4-bis(2,2â²-bithiophene-5-yl)benzene; o-PhBT2, m-PhBT2 and p-PhBT2) and analyses of their photophysical properties are reported. The electronic structures were also studied by the molecular orbital (MO) method. It was found that the extension of Ï-conjugation varies with the substitution mode (o-, m-, or p-), which in turn influences the absorption, fluorescence and transient absorption spectra. The unique behaviour of o-PhBT2 was interpreted in terms of its lowest unoccupied MO (LUMO) pattern, in which Ï-orbitals on the adjacent sulfur atoms in each bithienyl moiety can have considerable overlap.
报告了三种双(2,2'-二噻吩-5-基)苯(1,2-、1,3-和1,4-双(2,2'-二噻吩-5-基)苯;o-PhBT2、m-PhBT2和p-PhBT2)的合成及其光物理特性的分析。还通过分子轨道(MO)方法研究了其电子结构。结果发现,π-共轭的扩展与取代方式(邻位、间位或对位)变化有关,进而影响了吸收、荧光和瞬态吸收光谱。o-PhBT2的独特行为通过其最低未占轨道(LUMO)模式进行了解释,在该模式中,每个二噻吩单元相邻的硫原子上的π轨道可以有相当大的重叠。