Figure 1
The coordination environment of the [B2O5]4− group. Displacement ellipsoids are drawn at the 80% probability level. [Symmetry codes: (i) −z + , x + , y; (ii) z, x + , −y; (iii) −y + , z, −x; (iv) z, x, y; (v) −x + , −y + , −z + ; (vi) −y + , z, −x; (vii) x, −y + , z − .] |