Acta Cryst. (2003). E59, m1050-m1052  [ doi:10.1107/S1600536803022980 ]

Sodium monensin dihydrate

F. A. Almeida Paz, P. J. Gates, S. Fowler, A. Gallimore, B. Harvey, N. P. Lopes, C. B. W. Stark, J. Staunton, J. Klinowski and J. B. Spencer

Abstract: The crystal structure of the title compound, [Na(C₃₆H₆₁O₁₁)]·2H₂O, was first reported by Duax et al. [J. Am. Chem. Soc. (1980), 102, 6725-6729]. We report here the crystal structure of a new polymorph, determined at the low temperature of 180  (2) K, in the same orthorhombic non-centrosymmetric space group P2₁2₁2₁. The structure contains one crystallographically unique sodium monensin complex, showing a highly distorted octahedral coordination environment for Na⁺, forming undulating layers in the ac plane. H atoms from the pendant hydroxyl groups involved in head-to-tail hydrogen bonding with the carboxylate group and from the crystallization water molecules occupying the interlayer spaces have been successfully located in difference Fourier maps.

Online 23 October 2003

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