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

✍ Scribed by Noriko, Kasuga C. ;Hiroshi, Kato ;Masafumi, Kurihara ;Masanori, Yumita ;Kazuo, Yamaguchi

• Publisher: International Union of Crystallography
• Year: 2007
• Tongue: English
• Weight: 399 KB
• Volume: 63
• Category: Article
• ISSN: 1600-5368
• DOI: 10.1107/s1600536807008239

✦ Synopsis

Single crystals of the the title compound, 2K^+^·C~58~H~56~O~18~
^2−^·4CH~3~OH, 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.