The first X-ray structural characterization of bicorannulenyl dianion has been accomplished for two alkali metal salts, [Li + (THF) 4 ] 2 [C 40 H 18 2– ] ( 1 ) and [Cs + (18-crown-6)] 2 [C 40 H 18 2– ] ( 2 ). This crystallographic study revealed the biaryl stereochemistry, geometry transformation upon acquiring two electrons, and different binding preferences of Li + vs Cs + ions in the solid-state products.
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Sumner et al. (2014) studied this question.
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