title: Hydro-nium perchlorate-dibenzo-18-crown-6 (1/1): monoclinic polymorph.
abstract: The asymmetric unit of the title compound, H(3)O(+)·ClO(4) (-)·C(20)H(24)O(6), contains two mol-ecules/ions of each species. Both dibenzo-18-crown-6 mol-ecules have a complexed hydro-nium ion inside their cavity with O-H⋯O and O-H⋯(O,O) links between the two species. The associated perchlorate anions also accept O-H⋯O hydrogen bonds from the hydro-nium ion. Both crown ether mol-ecules are present in a butterfly conformation with approximate C(2v) symmetry and their cavities are closed by the benzene ring of a neighbouring mol-ecule. The packing is consolidated by C-H⋯O and C-H⋯π inter-actions.
authors: Michaela
authors: M
authors: Pojarová
authors: Karla
authors: K
authors: Fejfarová
authors: Emanuel
authors: E
authors: Makrlík