Acta Cryst. (2014). C70, 173-177 [ doi:10.1107/S2053229613034840 ]
Abstract: In poly[[4-1,4-bis(pyridazin-4-yl)benzene-1:2:3:44N1:N2:N1':N2']di-2-chlorido-dicopper(I)], [Cu2Cl2(C14H10N4)]n, (I), and its isomorphous bromide analogue, [Cu2Br2(C14H10N4)]n, (II), the organic ligand is situated across a centre of inversion. The CuI cations adopt a distorted tetrahedral [CuN2X2] [X = Cl in (I) or Br in (II)] environment [Cu-N = 2.0183 (14)-2.0936 (14) Å; Cu-Cl = 2.2686 (6) and 2.4241 (5) Å; Cu-Br = 2.4002 (6) and 2.5284 (5) Å] and the primary coordination motif consists of cuprohalogenide chains accommodating -pyridazine groups. The organic ligands are tetradentate and link the inorganic chains into corrugated layers. Their packing is influenced by interlayer anion interactions [Cl = 3.540 (2) Å and Br = 3.593 (2) Å] with the electron-deficient pyridazine rings. This kind of interaction precludes the characteristic slipped - stacking and close parallel alignment of the organic tectons; it may be involved as a structure-defining factor for coordination layers based upon lengthy polyaromatic linkers.
Formula: [Cu2Cl2(C14H10N4)] and [Cu2Br2(C14H10N4)]
Keywords: crystal structure; pyridazine ligands; coordination polymers; isomorphous compounds; anion interactions.
Structure factor file (CIF format) (84.6 kbytes)
Structure factor file (CIF format) (88.6 kbytes)
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