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The crystal structure of Hf2N11. a) View of the crystal structure along the c‐axis. Blue: N atoms of the infinite chains, green: N atoms that form dumbbells, orange: discrete N atoms. b) Coordination environment of the Hf atom. c) Coordination environment of polymeric nitrogen chains. d) Coordination environment of discrete nitrogen atoms and nitrogen dumbbells. e) Double‐helix chain built of nitrogen atoms running along the c‐direction.
