Three New
Mixed-Alkali- and Alkaline-Earth-Metal Borates:
From 1D Chain to 2D Layer to 3D Framework
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Abstract
Three new mixed-metal borates, K<sub>4</sub>Ba<sub>2</sub>[B<sub>14</sub>O<sub>20</sub>(OH)<sub>10</sub>]·3H<sub>2</sub>O (<b>1</b>), LiSr<sub>2</sub>[B<sub>10</sub>O<sub>16</sub>(OH)<sub>3</sub>] (<b>2</b>), and LiBa[B<sub>9</sub>O<sub>15</sub>]
(<b>3</b>), have been made under hydro(solvo)thermal conditions
and characterized by means of IR, UV–vis–near-IR, thermogravimetric
analysis, powder X-ray diffraction, and single-crystal X-ray diffraction,
respectively. <b>1</b> is a 1D chain constructed from B<sub>14</sub>O<sub>21</sub>(OH)<sub>10</sub><sup>10–</sup> cluster
units, <b>2</b> is of a 2D layer with nine-membered-ring windows
built up of B<sub>10</sub>O<sub>19</sub>(OH)<sub>3</sub><sup>9–</sup> cluster units, while <b>3</b> exhibits a 3D framework with
12-membered-ring channels composed of B<sub>3</sub>O<sub>7</sub> cluster
units
