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Published on: August 18, 2023
Crystal structure of [Ni(OH2)6]Cl2·(18-crown-6)2·2H2O
Jacob P Brannon1, Kevin Liang1, S Chantal E Stieber1
1Department of Chemistry & Biochemistry California State Polytechnic University, Pomona 3801 W Temple Ave Pomona CA 91768 USA.
Abstract:
The crystal structure of the title compound, hexa-aqua-nickel(II) dichloride-1,4,7,10,13,16-hexa-oxa-cyclo-octa-deca-ne-water (1/2/2), [Ni(H2O)6]Cl2·2C12H24O6·2H2O, is reported. The asymmetric unit contains half of the Ni(OH2)6 moiety with a formula of C12H32ClNi0.50O10 at 105 K and triclinic (P1) symmetry. The [Ni(OH2)6]2+ cation has close to ideal octa-hedral 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 mol-ecules, Cl- anions, and co-crystallized water solvent. Two crown ether mol-ecules flank the [Ni(OH2)6]2+ mol-ecule 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 octa-hedral geometry of [Ni(OH2)6]2+.
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