Abstract
THE most recent theory of the structure of Wurster type dyes (oxidation products of p-phenylenediamines) is that of Granick and Michaelis1. One of their main conclusions was that polymerization of a semiquinone ion of the type depicted below is impossible when all the amino hydrogens are substituted. In support of this conclusion, they instanced the existence of a crystalline perchlorate of Wurster's Blue (the oxidation product or δ-salt of tetramethyl paraphenylenediamine)2 the paramagnetism of which indicates the presence in the molecule of one unpaired electron.
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References
Michaelis, L., and Granick, S., J. Amer. Chem. Soc., 65, 1747 (1943).
The paramagnetism of the perchlorate of Wurster's Blue was first studied by H. Katz, Z. Phys., 87, 242 (1933).
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HUGHES, G., HUSH, N. & MELLOR, D. Polymerization of a Semiquinone Ion. Nature 159, 612 (1947). https://doi.org/10.1038/159612b0
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DOI: https://doi.org/10.1038/159612b0
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