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The title coordination polymer, [Pb 2 (N 3 ) 3 (NO 2 )(C 12 H 8 N 2 ) 2 ]  n  , has as the repeat unit a centrosymmetric dinuclear mol­ecule having azide and nitrite groups that bridge adjacent heterocycle-coordinated metal centers. One of the azide group uses its terminal ends to bridge whereas the nitrite group chelates to one metal atom and uses one of its O atoms to bridge. The azide and nitrite groups are disordered with respect to each other in a 1:1 ratio. Adjacent dinuclear mol­ecules are further bridged by the other two azide groups, generating a linear chain motif parallel to [010]. Half of the Pb atoms show a Ψ-dodeca­hedral coordination and the other half show a Ψ-penta­gonal-bipyramidal coordination.

acta crystallographica. section e

catena-Poly[[(1,10-phenanthroline-κ2N,N′)lead(II)]-μ-azido-κ2N1:N3-μ-nitrito-κ3O,O′:O′-[(1,10-phenanthroline-κ2N,N′)lead(II)]-di-μ-azido-κ4N1:N1]