Crystal structure of potassium hydrogen bis­((E)-2-{4-[3-(thio­phen-3-yl)acrylo­yl]phen­oxy}acetate)

The synthesis and spectroscopic data of (E)-2-{4-[3-(thio­phen-3-yl)acrylo­yl]phen­oxy}acetic acid are described. Crystallization from an ethanol–water mixture resulted in the title compound, C(30)H(23)KO(8)S(2) or [K(C(15)H(11)O(4)S)(C(15)H(12)O(4)S)](n), containing one mol­ecule of the acid and one mol­ecule of the potassium salt in the asymmetric unit. Both mol­ecules share the H atom between their carboxyl groups and a potassium ion. The C=C bonds display an E configuration. The thio­phene and phenyl rings in the two mol­ecules are inclined by 43.3 (2) and 22.7 (2)°. The potassium ion is octa­hedrally coordinated by six O atoms. This distorted octa­hedron shares on opposite sides two oxygen atoms with inversion-related octa­hedra, resulting in chains of octa­hedra running in the [010] direction, which form ladder-like chains by C—H⋯π inter­actions. A Hirshfeld surface analysis indicates that the highest contributions to the surface contacts arise from inter­actions in which H atoms are involved, with the most important contribution being from H⋯H (31.6 and 31.9% for the two mol­ecules) inter­actions.