Acta Cryst. (2007). E63, m924-m926  [ doi:10.1107/S1600536807008239 ]

Dipotassium salt of a double-armed terephthalic acid derivative: dipotassium 2,5-bis(2-{2-[2-(2-{2-[2-(2-hydroxyethoxy)phenoxy]ethoxy}phenoxy)ethoxy]phenoxy}methyl)terephthalate methanol tetrasolvate

K. C. Noriko, K. Hiroshi, K. Masafumi, Y. Masanori and Y. Kazuo

Abstract: Single crystals of the the title compound, 2K⁺·C₅₈H₅₆O₁₈^2-·4CH₃OH, were obtained from a methanol solution. The anion is centrosymmetric; consequently the asymmetric unit contains one-half of the salt and two methanol molecules. Each polyether chain contains one K⁺, which is coordinated by eight O atoms belonging to the carboxylate, terminal hydroxy and six ether groups. The structure of the entire anion is such that the two K⁺ are enclosed in the shape of an S. One methanol molecule forms hydrogen bonds with the O atom of the carboxylate group that does not participate in the coordination. The other methanol molecule forms hydrogen bonds with the other O atom of the carboxylate group that coordinates with K⁺ and also with the terminal hydroxy group of an adjacent salt unit.

Online 28 February 2007

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