Pyrazolino[60]fullerene-Oligophenylenevinylene Dumbbell-Shaped Arrays: Synthesis, Electrochemistry, Photophysics, and Self-Assembly on Surfaces
作者:Fernando Langa、Maria J. Gomez-Escalonilla、Jean-Michel Rueff、Teresa M. Figueira Duarte、Jean-François Nierengarten、Vincenzo Palermo、Paolo Samorì、Yannick Rio、Gianluca Accorsi、Nicola Armaroli
DOI:10.1002/chem.200500089
日期:2005.7.18
oligophenylenevinylene (OPV) derivatives bearing terminal p-nitrophenylhydrazone groups have been prepared and used for the synthesis of dumbbell-shaped bis(pyrazolino[60]fullerene)-OPV systems. In these triad arrays, the OPV-type fluorescence is dramatically quenched as a consequence of ultrafast OPV-->C60 singlet energy transfer. In its turn the fullerene singlet state is quenched by pyrazoline-->C60 electron
已经制备了带有末端对硝基苯基hydr基团的对称取代的低聚亚苯基亚乙烯基(OPV)衍生物,并将其用于合成哑铃形的双(吡唑并[60]富勒烯)-OPV体系。在这些三单元组阵列中,由于超快的OPV-> C60单线态能量转移,OPV型荧光显着淬灭。反过来,与相应的参考富勒烯分子的行为相一致,富勒烯单重态被吡唑啉-> C60电子转移淬灭。通过在CH2Cl2中在77 K时富勒烯荧光的恢复以及在298 K中在甲苯中的富勒烯荧光的恢复,证明了多组分阵列中电子转移的发生。在这些条件下,OPV-> C60的能量转移不受影响。事实证明,对于OPV三聚体,此过程的速率要比相应的五聚OPV阵列高。这与能量转移理论的预期相符。扫描隧道显微镜(STM)和扫描力显微镜(SFM)表明,双(吡唑啉并[60]富勒烯)-OPV可以在高度取向的热解石墨的基面上自组装成有序的层状晶体结构。