| Abstrakt: |
The crystal structure of the title compound, hexaaquanickel(II) dichloride- 1,4,7,10,13,16-hexaoxacyclooctadecane-water (1/2/2), [Ni(H2O)6]Cl2- 2C12H24O6183;2H2O, is reported. The asymmetric unit contains half of the Ni(OH2) 6 moiety with a formula of C12H32CINi0.50O10 at 105 K and triclinic (P1) symmetry. The [Ni(OH2)6]2+ cation has close to ideal octahedral geometry with O-Ni-O bond angles that are within 3° of idealized values. The supra- molecular structure includes hydrogen bonding between the water ligands, 18-crown-6 molecules, Cl- anions, and co-crystallized water solvent. Two crown ether molecules flank the [Ni(OH2)6]2+ molecule at the axial positions in a sandwich-like structure. The relatively symmetric hydrogen-bonding network is enabled by small Cl- counter-ions and likely influences the more idealized octahedral geometry of [Ni(OH2)6]2+. [ABSTRACT FROM AUTHOR] |
