title: (Borohydrido)(18-crown-6)potassium and (borohydrido)(dibenzo-18-crown-6)(tetrahydrofuran)potassium.
abstract: In the two compounds (borohydrido)(1,4,7,10,13,16-hexaoxacyclooctadecane-kappa(6)O)potassium, [K(BH(4))(C(12)H(24)O(6))], (I), and (borohydrido)(1,4,7,10,13,16-hexaoxa-2,3:11,12-dibenzocyclooctadeca-2,11-diene-kappa(6)O)(tetrahydrofuran)potassium, [K(BH(4))(C(4)H(8)O)(C(20)H(24)O(6))], (II), the K atom is bound to the six O atoms of the crown ether and to a tridentate borohydride group, with further coordination to a tetrahydrofuran molecule in (II). The alkali metal ion environment is thus distorted hexagonal-pyramidal in (I) and bipyramidal in (II).
authors.affiliation: CEA/Saclay, DSM/DRECAM/SCM (CNRS URA 331), Bâtiment 125, 91191 Gif-sur-Yvette, France.
authors.forename: Claude
authors.initials: C
authors.lastname: Villiers
authors.forename: Pierre
authors.initials: P
authors.lastname: Thuéry
authors.forename: Michel
authors.initials: M
authors.lastname: Ephritikhine