(18-Crown-6)potassium(I) di­phenyl­stibate(−1)

Red crystals of the title salt, [K(C(12)H(24)O(6))][Sb(C(6)H(5))(2)], were obtained by the reaction of SbPh(3), KSnBi and 18-crown-6 in liquid ammonia. The asymmetric unit contains one half of a [K(18-crown-6)](+) cation and one half of an SbPh(2) (−) anion, with the central element lying on a twofold axis and a centre of inversion, respectively. In the crystal structure, the sequestered potassium cations show weak inter­actions with the π-electrons of the phenyl groups of the SbPh(2) (−) anion [shortest K⋯C distances = 3.190 (2) and 3.441 (2) Å], leading to one-dimensional strands along the crystallographic c axis. These strands are aligned in a pseudo-hexa­gonal packing perpendicular to the ab plane.