Key indicators: single-crystal X-ray study; T = 100 K; mean (P-C) = 0.004 Å; R factor = 0.040; wR factor = 0.096; data-to-parameter ratio = 15.5.In the title complex, K 2 [Co(CH 4 O 6 P 2 ) 2 (H 2 O) 2 ], the asymmetric unit contains two K + cations and two half-anions in which the Co atoms lie on inversion centers. The Co II ions assume an octahedral CoO 6 coordination geometry. In the crystal, a three-dimensional network is formed through O-HÁ Á ÁO hydrogen-bond interactions as well as intermolecular interactions between the K + cations and neighbouring O atoms.
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ExperimentalCrystal data
Key indicators: single-crystal X-ray study; T = 103 K; mean (P-C) = 0.003 Å; R factor = 0.026; wR factor = 0.097; data-to-parameter ratio = 14.0.In the salt, (NH 4 ) 2 [Co(CH 4 O 6 P 2 ) 2 (H 2 O) 2 ], the methylenediphosphonate acts as a bidentate ligand and the Co II ion (site symmetry 1) assumes an octahedral CoO 6 coordination geometry. The acid H atom of the ligand is distributed over two O atoms. In the crystal, a three-dimensional network is formed through O-HÁ Á ÁO and N-HÁ Á ÁO hydrogen bonds between the cations and anions.
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