Crystal structures of two solvates of (18-crown-6)potassium acetate

The crystal and mol­ecular strutures of two solvated forms of [K(18c6)]OAc (18c6 = 18-crown-6 = 1,4,7,10,13,16-hexa­oxa­cyclo­octa­decane and OAc = acetate) were determined by single-crystal X-ray diffraction, namely (acetato-κ(2) O,O′)(1,4,7,10,13,16-hexa­oxa­cyclo­octa­decane-κ(6) O)potassium dihydrate, [K(CH(3)COO)(C(12)H(24)O(6))]·2H(2)O (1) and (acetato-κ(2) O,O′)aqua­(1,4,7,10,13,16-hexa­oxa­cyclo­octa­decane-κ(6) O)potassium acetic acid monosolvate [K(CH(3)COO)(C(12)H(24)O(6))(H(2)O)]·CH(3)COOH (2). In both compounds, the acetate anion is bonded to the potassium ion in a chelating fashion and the metal atom is consequently slightly displaced from the O(6) plane of the crown ether. In the crystals, O—H⋯O hydrogen bonds lead to a polymeric ladder structure in the dihydrate 1, while the acetic acid hydrate 2 features inversion dimers.