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In the title complex, [Zn(C9H5O6)2(C11H10N4)2]·8H2O, the ZnII ion exhibits site symmetry 2. It shows a distorted tetra­hedral coordination defined by two N atoms from two symmetry-related 1-[(1H-benzimidazol-2-yl)meth­yl]-1H-imid­azole ligands and by two O atoms from two symmetry-related monodeprotonated 3,5-dicarb­oxy­benzoate anions. In the crystal, complex mol­ecules and solvent water mol­ecules are linked through inter­molecular O—H...O, O—H...N, and N—H...O hydrogen bonds into a three-dimensional network.

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The asymmetric unit of the title co-crystal adduct, C6H4O2·C6F4I2, comprises a half-mol­ecule each of cyclo­hexa-2,5-diene-1,4-dione and 1,2,4,5-tetra­fluoro-3,6-diiodo­benzene. The C6F4I2 mol­ecule is almost planar (r.m.s. deviation = 0.0062 Å). In the crystal, the components are connected through O...I halogen bonds [3.017 (11) Å], leading to the formation of wavelike chains along the a axis. The crystal packing also features C—H...F inter­actions.
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