Abstract
A new strontium borate, Sr 2B 16O 26, has been prepared by solid-state reactions at temperature below 750 °C. The single-crystal X-ray structural analysis showed that Sr 2B 16O 26 crystallizes in the monoclinic space group P2 1/ c with a = 8.408(1) Å, b = 16.672(2) Å, c = 13.901(2) Å, β = 106.33(1)°, and Z = 4. Its crystal structure consists of a 3D network of the complex borate anion [B 16O 20O 12/2] 4−, formed by 12 BO 3 triangles and 4 BO 4 tetrahedra, which can be viewed as 3 linked [B 3O 3O 4/2] − triborate groups bonded to 1 pentaborate [B 5O 6O 4/2] − group and 2 BO 3 triangles; this leads to a Fundamental Building Block (FBB) with the shorthand notation 16: ∞ 3[3 × (3:2Δ + T) + (5:4Δ + T) + 2Δ]. The 3D network affords intersecting open channels running parallel to the crystallographic a and c axes, where Sr 2+ cations reside. The IR spectrum further confirms the presence of both BO 3 and BO 4 groups.
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