Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

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 H₂edta^2- 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.