Collect. Czech. Chem. Commun. 1995, 60, 820-828

Crystal Structure of the Adduct Hexahydroxotelluric Acid-Disodium Ethylenediaminetetraacetate-Water (1/1/2)

Ivana Císařová, Jana Podlahová and Jaroslav Podlaha

Department of Inorganic Chemistry, Charles University, 128 40 Prague 2, Czech Republic


The title compound crystallizes in the form of racemic twins of hexagonal symmetry from slightly acidic aqueous solutions containing H6TeO6 and Na2H2edta in a broad range of molar ratios. The crystals are of excellent quality and high diffraction power, thus enabling the structure determination with a precission not routinely attainable by conventional single crystal X-ray diffraction (R = 0.015 at room temperature). The building units of the structure, held together by a system of hydrogen bonds, are the octahedral Te(OH)6 molecule, the H2edta2- anion with protonated nitrogens, two water molecules and two sodium cations surrounded by ten oxygens in the O4Na(mi-O)2NaO4 moiety of irregular geometry.