Properties of solvent-free perylene iodine |
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Authors: | Z Buffett P K Ummat W R Datars |
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Institution: | Department of Physics and Astronomy, McMaster University, Hamilton ON L8S 4M1, Canada |
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Abstract: | The perylene iodine system was prepared by a vapour-phase reaction without the use of solvents. Compositions between peryleneI2 and peryleneI6 were synthesized and studied by gravimetric analysis, infrared spectroscopy, X-ray diffraction and temperature-dependent resistivity measurements. Infrared spectra in the region 400–4000 cm−1 taken after different amounts of iodine were removed from the sample are distinct from perylene with new absorption lines at 1551 and 1302 cm−1 and shifts of some perylene frequencies. Powder X-ray diffraction measurements indicate that the lattice is monoclinic with parameters a=11.65 Å, b=10.85 Å, c=10.1 Å, β=100.5°. The (1 0 0) reflection, which is forbidden in the space group of perylene, is observed from the compound. The material is electrically conductive and obeys Ohm's law at high temperatures. At low temperatures and high currents, nonlinear effects are observed. The conductivity of the material increases to 1.0 (Ω cm)−1 at room temperature as the iodine content increases to a composition of peryleneI6. The resistivity obeys an exponential temperature dependence. |
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Keywords: | Perylene iodine Infrared spectroscopy Resistivity Gravimetric analysis X-ray diffraction |
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