Abstract
The title salt, [K2(C16H12O6)]n, was obtained by the reaction of 1,2-bis[4-(ethyl-carboxyl)-phenoxyl]ethane with KOH in water. The anion lies on a crystallographic inversion center, which is located at the mid-point of the central C—C bond. The K+ cation is coordinated by six O atoms, two from the chelating carboxylate group of the anion and four from four neighboring and monodentately binding anions, giving rise to an irregular [KO6] coordination polyhedron. The coordination mode of the cation leads to the formation of K/O layers parallel to (100). These layers are linked by the nearly coplanar anions (r.m.s. deviation of 0.064 Å of the carboxyl, aryl and O—CH2 groups from the least-squares plane) into a three-dimentional network.
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