Core halogenation as a construction principle in tuning the material properties of tetraazaperopyrenes
A detailed study on the effects of core halogenation of tetraazaperopyrene (TAPP) derivatives is presented. Its impact on the solid structure, as well as the photophysical and electrochemical properties, has been probed by the means of X-ray crystallography, UV/Vis and fluorescence spectroscopy, hig...
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| Main Authors: | , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
October 28, 2015
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| In: |
Chemistry - a European journal
Year: 2015, Volume: 21, Issue: 49, Pages: 17691-17700 |
| ISSN: | 1521-3765 |
| DOI: | https://doi.org/10.1002/chem.201503484 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/https://doi.org/10.1002/chem.201503484 Verlag, lizenzpflichtig, Volltext: https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/chem.201503484 
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| Author Notes: | Lena Hahn, Friedrich Maaß, Tim Bleith, Ute Zschieschang, Hubert Wadepohl, Hagen Klauk, Petra Tegeder, and Lutz H. Gade |
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| 245 | 1 | 0 | |a Core halogenation as a construction principle in tuning the material properties of tetraazaperopyrenes |c Lena Hahn, Friedrich Maaß, Tim Bleith, Ute Zschieschang, Hubert Wadepohl, Hagen Klauk, Petra Tegeder, and Lutz H. Gade |
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| 520 | |a A detailed study on the effects of core halogenation of tetraazaperopyrene (TAPP) derivatives is presented. Its impact on the solid structure, as well as the photophysical and electrochemical properties, has been probed by the means of X-ray crystallography, UV/Vis and fluorescence spectroscopy, high-resolution electron energy loss spectroscopy (HREELS), cyclic voltammetry (CV), and DFT modeling. The aim was to assess the potential of this approach as a construction principle for organic electron-conducting materials of the type studied in this work. Although halogenation leads to a stabilization of the LUMOs compared to the unsubstituted parent compound, the nature of the halide barely affects the LUMO energy while strongly influencing the HOMO energies. In terms of band-gap engineering, it was demonstrated that the HOMO-LUMO gap is decreased by substitution of the TAPP core with halides, the effect being found to be most pronounced for the iodinated derivative. The performance of the recently reported core-fluorinated and core-iodinated TAPP derivatives in organic thin-film transistors (TFTs) was investigated on both a glass substrate, as well as on a flexible plastic substrate (PEN). Field-effect mobilities of up to 0.17 cm2 Vs−1 and on/off current ratio of >106 were established. | ||
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