Abstract
INDOLE and iodine form a black complex that exhibits a strong electron spin resonance signal1. The interpretation that has been given is that indole, if complexed with a small acceptor such as iodine, may act as an especially strong electron donor due to the negative formal charge that exists on carbon 2 and 3.
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References
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SMALLER, B., ISENBERG, I. & BAIRD, S. Spin Resonance and Electrical Conductivity of Indole-Iodine. Nature 191, 168–169 (1961). https://doi.org/10.1038/191168a0
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DOI: https://doi.org/10.1038/191168a0
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