Binary salt of a palladium(II) complex with (phosphonomethyl)phosphonic (medronic) acid comprising `handbell-like' [Pd{μ-CH2(PO3)2}]3 units

• Published in: Acta crystallographica. Section C, Crystal structure communications Vol. 68; no. 9; pp. m242 - m245
• Main Authors: Babaryk, Artem A., Kozachkova, Alexandra N., Tsaryk, Natalia V., Dudko, Anatolij V., Pekhnyo, Vasily I.
• Format: Journal Article
• Language: English
• Published: 5 Abbey Square, Chester, Cheshire CH1 2HU, England International Union of Crystallography 01.09.2012
• Subjects: Alternations; Asymmetry; Cations - chemistry; Crystal structure; Crystallography, X-Ray; Hydrogen Bonding; Hydrogen bonds; Methylene; Molecular Structure; Networks; Nickel - chemistry; Organometallic Compounds - chemistry; Palladium - chemistry; Phosphorous Acids - chemistry; Salts - chemistry; Solvents; Three dimensional; Water - chemistry
• ISSN: 0108-2701; 1600-5759
• DOI: 10.1107/S0108270112031368

The asymmetric unit of the title compound, dipotassium bis[hexaaquanickel(II)] tris(μ2‐methylenediphosphonato)tripalladium(II) hexahydrate, K2[Ni(H2O)6]2[Pd3{CH2(PO3)2}3]·6H2O, consists of half a {[Pd{CH2(PO3)2}]3}6− anion [one Pd atom (4e) and a methylene C atom (4e) occupy positions on a twofold axis] in a rare `handbell‐like' arrangement, with K+ and [Ni(H2O)6]2+ cations to form the neutral complex, completed by three solvent water molecules. The {[Pd{CH2(PO3)2}]3}6− units exhibit close Pd...Pd separations of 3.0469 (4) Å and are packed via intermolecular C—H...Pd hydrogen bonds. The [KO9] and [NiO6] units are assembled into sheets coplanar with (011) and stacked along the [100] direction. Within these sheets there are [K4Ni4O8] and [K2Ni2O4] loops. Successive alternation of the sheets and [Pd{CH2(PO3)2}]3 units parallel to [001] produces the three‐dimensional packing, which is also supported by a dense network of hydrogen bonds involving the solvent water molecules.