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Pure thio-hydroxo-germanates can be prepared from aqueous solutions by reactions of stoichiometric amounts of either sodium sulfide and GeO 2 , or NaOH and GeS 2 . The preparation of colourless crystalline Na 2 GeS 2 (OH) 2  · 5 H 2 O is reported. The compound is characterized by a single-crystal X-ray structure analysis. It is orthorhombic, space group Pbcn, with a = 10.752(2), b= 13.787(2), c = 14.150(2) Å. The structure contains novel monomeric GeS 2 (OH) 2  2-  anions with Ge-S bond distances of 2.150(1) and 2.145(1) Å and with Ge-O lengths of 1.809(3) and 1.815(3) Å. An extensive S ··· HO-and O -HO-hydrogen bond system connects the anions with the octahedrally coordinated Na +  ions. The vibrational spectra are reported. The symmetric GeS 2  andGeO 2  stretching vibrations in the anion are observed at 415 and 618 cm -1 .

zeitschrift für naturforschung b

Thio-hydroxoanionen des Germaniums: Darstellung, Struktur und Eigenschaften von Na 2 GeS 2 (OH) 2  · 5 H 2 O / Thio-hydroxo Anions of Germanium: Preparation, Structure and Properties of Na 2 GeS 2 (OH) 2  · 5 H 2 O