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In this study, Szent-Gyorgyi and Isenberg examined the charge-transfer behavior of indole, and speculated about why indole and some indole derivatives (such as serotonin and tryptophan) readily form charge-transfer complexes with substances like riboflavin, even though indole's structure does not predict such reactivity.
Periodical:
Proceedings of the National Academy of Sciences of the United States of America
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Periodical. Szent-Gyorgyi, Albert, and Irvin Isenberg. "On the Electron-Donating Properties of Indoles." Proceedings of the National Academy of Sciences of the United States of America 46, 10 (15 October 1960): 1334-1336. Article. 3 Images.. Proceedings of the National Academy of Sciences of the United States of America