Based on 1H, 7Li, and 13C NMR chemical shifts of phenalenyl ions, it is argued that the observed diamagnetism of the systems is due to the diatropic benzene and naphthalene subcircuits. MNDO and graph theoretical calculations support this observation.
I. Sethson, D. Johnels, U. Edlund and A. Sygula, J. Chem. Soc., Perkin Trans. 2, 1990, 1339 DOI: 10.1039/P29900001339
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