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Structure of the novel isostructural sodium polychloride hP18-Na4Cl5 and sodium polybromide hP18-Na4Br5 synthesized in this work. (a) Unit cell viewed along the c direction; Na atoms are red, and Cl (or Br) atoms are blue; (b) perspective view of the structure highlighting the linear polyhalogen chains along the c direction; and (c) polyhedral model of the structure; coordination polyhedra for Na1 and Na2 atoms are shown separately.
