I. Zviedre, S. Belyakov
Aug 6, 2006
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Journal
Russian Journal of Inorganic Chemistry
Abstract
Potassium bis(malonato)borate C6H4BKO8 (I) was synthesized for the first time in an aqueous medium. Well-shaped single crystals were formed. Their X-ray diffraction structure (space group P\(\overline 1 \), a = 7.4073(2) A, b = 7.9161(2) A, c = 9.0755(2) A, α 113.225(1)°, β = 91.553(1)°, γ = 104.760(2)°, Z = 2) was refined by the full-matrix least-squares method in the anisotropic (K, C, O, B) or isotropic (H) approximations to R1 = 0.394, wR2 = 0.1080, 2661 independent reflections (Bruker-Nonius KappaCCD, λMoKα radiation). The structure is formed by spirane-type complex anions and potassium cations. A complex anion consists of two malonic acid molecules coordinated in the bidentate mode to the same four-coordinate boron atom. The K+ coordination geometry is an irregular nine-vertex polyhedron formed by the oxygen atoms of seven complex anions. The structure of compound I is layered.