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Comment on “Persistent Room‐Temperature Radicals from Anionic Naphthalimides: Spin Pairing and Supramolecular Chemistry” and on “Persistent Radical Pairs between N‐Substituted Naphthalimide and Carbanion Exhibit p K a‐Dependent UV/Vis Absorption”
Author(s) -
Korth HansGert
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202003437
Subject(s) - chemistry , carbanion , diradical , radical , electron paramagnetic resonance , intramolecular force , photochemistry , intermolecular force , radical ion , yield (engineering) , electron transfer , ion , computational chemistry , singlet state , medicinal chemistry , stereochemistry , molecule , nuclear magnetic resonance , organic chemistry , excited state , materials science , nuclear physics , metallurgy , physics
EPR spectroscopic evidence for intramolecular electron transfer in anionic N‐substituted naphthalimides to yield persistent diradical anions and intermolecular electron transfer from a variety of carbanions to 6‐bromo‐ N ‐phenyl‐naphthalimide to yield persistent radical–radical anion pairs was recently claimed in two papers by Zhang et al. In this comment, it is shown that the EPR spectra published in both papers do not agree with the proposed triplet‐state species. Rather, the spectra are due to various doublet‐state radicals, deriving from minor side reactions. The misinterpretations invalidate the general conclusions of the papers.