Abstract
Abstract The structural study of some hydrated thallium (I) borates shows the existence of macroionic chains which can be considered as condensed heterocycles. In Tl [B3O4(OH)2] 0.5H2O, the unit is the well known B3O3 ring; it is formed by two BO3 triangles (Δ) and one BO4 tetrahedron (T); these units are linked to form an infinite chain; its shorthand notation is 3:∞1 (2Δ + T). The structure of Tl4 [B7O10(OH)3 · OBO(OH)] H2O contains a unit constituted by three B3O3 rings linked together by boron atoms; each ring is formed by two BO4 tetrahedra and one BO3 triangle; the corresponding fully hydrated polyanion is [B7O9(OH)7]4-. The chain is made up of units linked by BO2(OH) triangles; the shorthand notation of this borate is: 7:∞1 [(3Δ + 4T) + Δ]. The structure of Tl8Ge5O14 is composed of isolated Ge5O14 units; they are formed by a crown of four GeO4 tetrahedra linked by shared oxygens; two other oxygens of two of these GeO4 tetrahedra belong also to a fifth GeO4 tetrahedron which is located at the center of the crown.
Published Version
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