Electrical Properties and Constitution of Several Low-resistivity Iodine Complexes

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Abstract
The electrical resistivity and Seebeck coefficient of the iodine complexes with eight aromatic compounds were examined as functions of the composition and the temperature. The formation of complexes is indicated by maxima or shoulders in the resistivity-composition isotherms at the following compositions: (anthanthrene)2I9, (6,12-dioxoanthanthrene)I2, (6,12-dioxoanthanthrene)I3, (pyranthrene)I3, (violanthrene)2I7, (phthalocyanine)I2, (phthalocyanine)I5, (phenoxazine)2I3, (pyridazine)5I9, and (N,N′-diphenyl-p-phenylenediamine5I13. Furthermore, some sharp resistivity minima are considered as evidence of the complex formation: e.g., (6,12)-dioxoanthanthrene)2I3 and (phthalocyanine)2I3. On the basis of these compositions, a nonintegral formal oxidation state for the organic molecules and the presence of iodine as triiodide or higher polyiodide ions are established for most of the complexes.