Acta Cryst. (2012). C68, m295-m299 [ doi:10.1107/S0108270112038048 ]
Abstract: In poly[di--chlorido--(4,4'-bipyridazine)-2N1:N1'-cadmium(II)], [CdCl2(C8H6N4)]n, (I), and its isomorphous bromide analogue, [CdBr2(C8H6N4)]n, (II), the halide atom lies on a mirror plane and the CdII ion resides at the intersection of two perpendicular mirror planes with m2m site symmetry. The pyridazine rings of the ligand lie in a mirror plane and are related to each other by a second mirror plane perpendicular to the first. The compounds adopt the characteristic structure of the [MIIX2(bipy)] type (bipy is bipyridine) based on crosslinking of [Cd(-X)2]n chains [Cd-Cl = 2.5955 (9) and 2.6688 (9) Å; Cd-Br = 2.7089 (4) and 2.8041 (3) Å] by bitopic rod-like organic ligands [Cd-N = 2.368 (3)-2.380 (3) Å]. This feature is discussed in terms of supramolecular stabilization, implying that the periodicity of the inorganic chain [CdCd = 3.7802 (4) Å in (I) and 3.9432 (3) Å in (II)] is favourable for extensive parallel - stacking of monodentate pyridazine rings, with centroid-centroid distances of 3.7751 (4) Å in (I) and 3.9359 (4) Å in (II). This is not the case for the longer iodide bridges, which cannot stabilize such a pattern. In poly[tetra--iodido-4-(4,4'-bipyridazine)-4N1:N2:N1':N2'-dicadmium(II)], [Cd2I4(C8H6N4)]n, (III), the ligands are situated across a centre of inversion; they are tetradentate [Cd-N = 2.488 (2) and 2.516 (2) Å] and link successive [Cd(-I)2]n chains [Cd-I = 2.8816 (3)-3.0069 (4) Å] into corrugated layers.
Formula: [CdCl2(C8H6N4)], [CdBr2(C8H6N4)] and [Cd2I4(C8H6N4)]
Structure factor file (CIF format) (34.7 kbytes)
Structure factor file (CIF format) (38.0 kbytes)
Structure factor file (CIF format) (92.2 kbytes)
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