More stable than it seems: The binary uranium–nitrogen anion U(N3)73− was synthesized and characterized as the (Bu4N)3[U(N3)7] salt. The U(N3)73− ion is the first structurally characterized heptaazide and is the first homoleptic azide of an actinide. The crystal structure shows a pentagonal-bipyramidal arrangement of the azide ligands around the central uranium(IV) atom (see structure; N: blue; U: green).
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Crawford et al. (2005) studied this question.
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