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| - Self-Organized Perylene Diimide Nanofibers
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| - A propeller-shaped perylene diimide trimer was synthesized and a simple evaporation method was used forthe self-organization of trimer molecules into fluorescent nanofibers. The sizes of these fibersfrom 4 to 150nm in diameterwere measured by atomic force microscopy and can be controlled by adjusting theconcentration of the initial solution. The aspect ratios (length/height) are around 500. The plane of the trimerwas determined by polarized scanning confocal microscopy to be perpendicular to the axis of the fibers, inagreement with molecular mechanics calculations. UV/vis and NMR spectroscopies were used to monitorconcentration-dependent π−π stacking in solution. Single-fiber fluorescence imaging and spectroscopy wereperformed using a total internal reflection fluorescence microscope equipped with a digital color camera andimaging CCD spectrometer. Strongly red-shifted fluorescence from these fibers indicates a high degree ofelectronic delocalization, and breaking up this delocalization by photobleaching blue-shifts the emission towardthat of an isolated noninteracting molecule. The delocalization along these nanofibers and the ability to studythe electronic structure using fluorescence make them potentially useful in nanoscale devices, such as fieldeffect transistors and photoconductors.
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