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).
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