title: Crystal structures of two solvates of (18-crown-6)potassium acetate.
abstract: The crystal and mol-ecular strutures of two solvated forms of [K(18c6)]OAc (18c6 = 18-crown-6 = 1,4,7,10,13,16-hexa-oxa-cyclo-octa-decane and OAc = acetate) were determined by single-crystal X-ray diffraction, namely (acetato-κ2O,O')(1,4,7,10,13,16-hexa-oxa-cyclo-octa-decane-κ6O)potassium dihydrate, [K(CH3COO)(C12H24O6)]·2H2O (1) and (acetato-κ2O,O')aqua-(1,4,7,10,13,16-hexa-oxa-cyclo-octa-decane-κ6O)potassium acetic acid monosolvate [K(CH3COO)(C12H24O6)(H2O)]·CH3COOH (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 O6plane of the crown ether. In the crystals, O-H⋯O hydrogen bonds lead to a polymeric ladder structure in the dihydrate1, while the acetic acid hydrate2features inversion dimers.
authors.affiliation: Chemisches Institut der Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany.
authors.forename: Phil
authors.initials: P
authors.lastname: Liebing
authors.affiliation: Chemistry Department, Haluoleo University, Kendari, Indonesia.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Zaeni
authors.affiliation: Institut für Anorganische und Angewandte Chemie der Universität Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany.
authors.forename: Falk
authors.initials: F
authors.lastname: Olbrich
authors.affiliation: Chemisches Institut der Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany.
authors.forename: Frank T
authors.initials: FT
authors.lastname: Edelmann
keywords: 18-crown-6; acetate; crown ether; crystal structure; hydrate; hydrogen bridge bonds; hydro­acetate; potassium