Abstract

Structures with a bang: The title anions are the first examples of doubly charged heptaazido anions and structurally characterized transition-metal heptaazides. Contrary to the either monocapped octahedral or pentagonal-bipyramidal actinide trianion [U(N3)7]3−, but in accord with the [NbF7]2− anion, the title anions have monocapped trigonal-prismatic structures (see picture; M=Nb, Ta).

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