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The asymmetric unit of the title compound, [InCl3(C12H12N2)(C3H7NO)]·0.5H2O, contains two independent InIII complex mol­ecules with similar structures and one lattice water mol­ecule. In each complex mol­ecule, the InIII atom is six-coordinated in a distorted octa­hedral geometry, formed by two N atoms from the chelating 5,5′-dimethyl-2,2′-bipyridine ligand, one O atom from a dimethyl­formamide and three facial Cl atoms. In the crystal, the lattice water mol­ecule is linked to the complex mol­ecules via O—H...Cl hydrogen bonds. Further weak C—H...Cl and C—H...O hydrogen bonds result in the formation of a three-dimensional structure.

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In the mol­ecule of the title compound, [CoBr2(C11H10N2)], the CoII atom is four-coordinated in a distorted tetra­hedral geometry by two N atoms from a chelating 6-methyl-2,2′-bipyridine ligand and two terminal Br atoms. In the crystal, π–π stacking inter­actions between the pyridine rings along the a-axis direction [centroid–centroid distance = 3.761 (7) Å] and C—H...Br hydrogen bonds in the bc plane together generate the three-dimensional packing.

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The title compound, [Cd2Br4(C24H16N2)2], consists of a centrosymmetric dimeric unit in which two Br atoms bridge two CdII atoms, forming a four-membered ring. A terminal Br atom and a bidentate chelating 4,7-diphenyl-1,10-phenanthroline ligand complete a square-pyramidal geometry for the CdII atom. In the crystal, C—H...Br hydrogen bonds and π–π contacts between the pyridine and phenyl rings [centroid–centroid distances = 3.704 (4) and 3.715 (4) Å] lead to a three-dimensional supra­molecular structure.

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In the crystal of the title polymeric compound, [CdBr2(C12H12N2)]n, the CdII cation is located on a twofold rotation axis and is six-coordinated in a distorted octa­hedral geometry formed by two N atoms from the 4,4′-dimethyl-2,2′-bipyridine ligand and by four bridging Br anions. The bridging function of the Br anions leads to a polymeric chain running along the c axis. Weak C—H...π inter­actions observed between adjacent chains are effective in the stabilization of the three-dimensional packing.

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In the title compound, [CdI2(C12H12N2)(C3H7NO)], the CdII cation is five-coordinated in a distorted trigonal–bipyramidal configuration by two N atoms from a 4,4′-dimethyl-2,2′-bipyridine ligand, one O atom from a dimethyl­formamide ligand and two I anions. π–π stacking between pyridine rings of adjacent mol­ecules [centroid–centroid distance = 3.666 (3) and 3.709 (4) Å] stabilizes the three-dimensional structure
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