Crystal structure of potassium tetra-acetatoborate

Abstract

The crystal structure of the title compound has been solved by direct methods from three-dimensional X-ray diffractometer data and refined by least-squares methods to R 0·075 for 848 observed reflections. All hydrogen atoms were located. Crystals are monoclinic, space group P2₁/n, with a= 17·665(2), b= 12·456(2), c= 6·090(3)Å, β= 100·11°, Z= 4. The structure consists of slightly distorted boron–oxygen tetrahedra held together by potassium ions. Four acetoxy-groups with only one B–O bond form each boron–oxygen tetrahedron of the anionic unit B(OAc)₄^–. The potassium ion is co-ordinated to seven oxygen atoms, with K–O distances 2·68–3·02 Å, so that all but one of the oxygen atoms of each anionic unit are linked to K⁺ ions. The eighth is far removed.