Hexa-aqua-nickel(II) di-hydrogen hypodiphosphate

Area of Science:

• Inorganic Chemistry
• Crystallography
• Coordination Chemistry

Background:

• Nickel(II) complexes are widely studied for their diverse coordination geometries and applications.
• Hypodiphosphates are interesting anions with potential roles in coordination chemistry.
• Understanding the crystal structure of metal-organic compounds provides insights into bonding and intermolecular interactions.

Purpose of the Study:

• To determine the crystal structure of the title compound, hexa-aqua-nickel(II) di-hydrogen hypodiphosphate ([Ni(H2O)6](H2P2O6)).
• To analyze the coordination environment of the nickel(II) ion.
• To investigate the hydrogen bonding network within the crystal structure.

Main Methods:

• Single-crystal X-ray diffraction was used to determine the crystal structure.
• The asymmetric unit was analyzed to identify the components of the crystal lattice.
• Coordination geometry and intermolecular interactions were characterized.

Main Results:

• The asymmetric unit contains half a hexa-aqua-nickel(II) cation and half a di-hydrogen hypodiphosphate anion.
• The nickel(II) ion exhibits an octa-hedral coordination sphere, located on an inversion center.
• The di-hydrogen hypodiphosphate anion is centrosymmetric with a P-P bond distance of 2.1853(7) Å.
• A three-dimensional network is formed by O-H⋯O hydrogen bonds between the cations and anions.

Conclusions:

• The crystal structure of [Ni(H2O)6](H2P2O6) has been elucidated.
• The nickel(II) ion is coordinated octa-hedrally by water molecules.
• The compound forms an extended three-dimensional supramolecular network through hydrogen bonding.