作者:Julien E. Gautrot、Philip Hodge、Domenico Cupertino、Madeleine Helliwell
DOI:10.1039/b701257h
日期:——
Anthraquinone derivatives have been little used in microelectronics though they are attractive scaffolds due to their electron-accepting properties. As part of a preliminary study, a series of conjugated anthraquinone derivatives has been synthesised. The crystal structures of 2,6-diphenyl-9,10-anthraquinone, 2,6-di(thien-2′-yl)-9,10-anthraquinone and 2,6-bis(9′,9′-dioctylfluoren-2′-yl)-9,10-anthraquinone are presented. The UV-Vis absorption spectra of the anthraquinone derivatives synthesised are characterised in each case by the presence of a very intense long-wavelength band that we attribute to intramolecular charge transfer (CT) from the electron-rich aromatic substituents to the electron-deficient anthraquinone moiety. The fluorescence of these compounds is also strongly affected by this intramolecular CT and quantum yields up to 6.8 × 10−2 were found in solution. This long wavelength emission in the yellow-orange region is reminiscent of the fluorescence of fluorenone derivatives substituted with aromatic groups, including fluorenone-containing polyfluorenes. The relatively high electron affinity of these compounds together with their tunable emission suggests their potential application in organic electronics. Additionally, the electrochemical behaviour of the present compounds reveals a partial destabilisation of both of the aromatic rings in the anthraquinone moiety. Finally, chemical doping experiments were conducted. These clearly show the extended conjugation characteristic of the reduced states of anthraquinone.
蒽醌衍生物因其电子接受特性而成为极具吸引力的支架,但在微电子学中的应用却很少。作为初步研究的一部分,我们合成了一系列共轭蒽醌衍生物。本文展示了 2,6-二苯基-9,10-蒽醌、2,6-二(噻吩-2′-基)-9,10-蒽醌和 2,6-双(9′,9′-二辛基芴-2′-基)-9,10-蒽醌的晶体结构。所合成的蒽醌衍生物的紫外-可见吸收光谱的特点都是存在一个非常强烈的长波长带,我们将其归因于分子内电荷转移(CT)从电子丰富的芳香族取代基到电子缺乏的蒽醌分子。这些化合物的荧光也受到分子内电荷转移的强烈影响,在溶液中的量子产率高达 6.8 × 10-2。这种在黄橙色区域的长波长发射让人联想到被芳香基团取代的芴酮衍生物(包括含芴酮的多芴化合物)的荧光。这些化合物相对较高的电子亲和性及其可调谐的发射表明它们有可能应用于有机电子学。此外,这些化合物的电化学行为表明,蒽醌分子中的两个芳香环部分失稳。最后,还进行了化学掺杂实验。这些实验清楚地显示了蒽醌还原态的扩展共轭特性。