The compound K2B40~.4H20 = K~[B4Os(OH)4].2H20 is orthorhombic, space group P212121, with four molecules in a cell of dimensions a = 12"899, b = 11.774, c = 6"859 A. The positions of all atoms (including the hydrogen atoms) have been determined. The final R-index is 0.040, and the bond lengths have been determined to an accuracy of 0.006 A for K-O bonds, 0.008 A for B-O bonds and 0.11 A for H-O bonds. The structure contains the complex ion [B4Os(OH)4] 2-consisting of two boron-oxygen triangles and two tetrahedra which have only corners in common. Detailed results are reported for bond distances, and bond angles and for the anisotropic thermal motions.
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Marezio et al. (1963) studied this question.
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