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Atomistry » Thallium » Chemical Properties » Thallous Borates | ||
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Thallous Borates
Thallous oxide dissolves in fused boron sesqui-oxide, and the liquid mass solidifies either to a clear glass or a crystalline solid. Various borates of thallium have been described by Buchtala.
Thallous tetraborate, Tl2B4O7
Thallous tetraborate, Tl2B4O7.2H2O, is obtained by dissolving thallous carbonate (1 mol.) and boric acid (1-4 mols.) in water, and crystallising. It is also obtained, together with thallous hexaborate, Tl2B6O10.3H2O, by fusing the carbonate (1 mol.) with boric acid (6 mols.) and crystallising the product from water. If more boric acid (8 mols.) is used, a mixture of the hexaborate and thallous decaborate, Tl2B10O16.8H2O, is produced.
Thallous octaborate, Tl2B8O13
Thallous octaborate, Tl2B8O13.4H2O, and thallous dodecaborate, Tl2B12O19.7H2O, are prepared by dissolving thallous carbonate (1 mol.) in excess of aqueous boric acid (10 mols.). The dodecaborate also forms a pentahydrate, which is monoclinic (a:b:c = 1.583:1:1.955; β = 94°25').
Thallous metaborate, TlBO2
Thallous metaborate, 2TlBO2.H2O, crystallises from water in colourless, wedge-shaped crystals which turn red and black on exposure to air.
Thallous perborate, Tl2B2O7
Thallous perborate, Tl2B2O7, i.e.
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