Interaction between aromatics and zinc chloride in the molten state. The formation of .SIGMA.-complexes and radicals.

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The electronic absorption spectra of naphthalene, anthracene, and naphthacene in dried, molten zinc chloride were measured and found to be almost the same as those of aromatics–aluminum chloride complexes in the solid state. ESR measurements were also made; they confirmed the presence of radicals. From these results, it was concluded that the aromatics reacted with molten zinc chloride to form EDA-complexes, <I>i. e.</I>, σ-complexes and cation radicals.
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