Influence of organic cations on the stacking of semiquinone radical anions (CROSBI ID 269328)
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Podaci o odgovornosti
Molčanov, Krešimir ; Milašinović, Valentina ; Ivić, Nives ; Stilinović, Vladimir ; Kolarić, Dinko ; Kojić-Prodić, Biserka
engleski
Influence of organic cations on the stacking of semiquinone radical anions
A series of seven novel salts of tetrachloro- and tetrabromosemiquinone radical anions with organic cations is prepared and structurally characterised by single-crystal X-ray diffraction. Four types of stacks of radical anions have been identified: i) stacks of pancake-bonded dimers (Peierls-distorted stacks), ii) stacks of pancake-bonded trimers, iii) stacks of equidistant radicals and iv) a novel type of equidistant stacks of partially charged radicals (charge: −1/2, imposed by a stoichiometry of 1 : 2). Cations play an important role in stabilisation of the stacks of radical anions ; the structures with stacks of equidistant radicals include columns of cations. However, the structures having pancake-bonded dimers and trimers are accompanied by isolated pairs of cations.
semiquinone radicals ; pancake bonding ; π interactions ; crystal engineering
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