Abstract
The radical cation (3 .+ ), radical anion (3 .- ), and dianion (3 2- ) of tetraoxaporphycene were generated from the neutral compound (3) and the dication (3 2+ ). The two paramagnetic species, 3 .+ and 3 .- , give rise to highly resolved ESR spectra, which have also been investigated by ENDOR and TRIPLE-resonance spectroscopy. The ion pairs formed by the radical anion 3 .- with alkali-metal counterions become less tight when the size of the cation increases from Li + through Na + and K + to Cs +
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