Nitrogen analogues of monomeric PO can be obtained as Li+ salts. Depending on the substituents at the nitrogen atoms, the anion is either coordinated to Li as in 1 or separated from the cation as in 2. The anion in2 has a propellerlike structure. Ar = 2,4,6-tri-tert-butyrphenyl, D = donor solvent.
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Niecke et al. (1994) studied this question.
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