Acta Crystallographica Section C

Crystal Structure Communications

Volume 62, Part 3 (March 2006)

metal-organic compounds

gz1022 scheme

Acta Cryst. (2006). C62, m112-m115 [ doi:10.1107/S0108270106002782 ]

Ammonium 1-hydroxy-2-(2-pyridinio)ethane-1,1-diyldiphosphonate dihydrate and potassium 1-hydroxy-2-(2-pyridinio)ethane-1,1-diyldiphosphonate dihydrate

K. Stahl, J. Oddershede, H. Preikschat, E. Fischer and J. S. Bennekou

Abstract: The crystal structures of the title compounds, ammonium risedronate dihydrate, NH₄⁺·C₇H₁₀NO₇P₂^-·2H₂O, (I), and potassium risedronate dihydrate, K⁺·C₇H₁₀NO₇P₂^-·2H₂O, (II), have been determined from single-crystal X-ray data collected at 120 K. Compound (I) forms a three-dimensional hydrogen-bonded network which connects the ammonium and risedronate ions and the water molecules. In compound (II), the K⁺ ions are seven-coordinated in a capped distorted trigonal prism. The coordination polyhedra form chains by corner-sharing, and these chains are connected by phosphonate groups into layers in the ac plane. The layers are stacked and connected by hydrogen bonds in the b direction. The risedronate conformation is determined by intramolecular interactions fine-tuned by crystal packing effects. All H-atom donors in both structures are involved in hydrogen bonding, with DA distances between 2.510 (2) and 3.009 (2) Å.

Formula: NH₄⁺·C₇H₁₀NO₇P₂^-·2H₂O and K⁺·C₇H₁₀NO₇P₂^-·2H₂O


	Structure factor file (CIF format) (194.4 kbytes) [ doi:10.1107/S0108270106002782/gz1022Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (149.8 kbytes) [ doi:10.1107/S0108270106002782/gz1022IIsup3.hkl ] Contains datablock II

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