Darstellung und Kristallstruktur einiger Tetracarboxylatoaurate(III) / Preparation and Crystal Structure of Some Tetracarboxylatoaurates(III)
2014
Various salts M(AuX₄)₂ with X = OCOCH₃ or OCOC₂H₅ have been prepared by two methods: (i) the reaction of metal hydroxides M(OH)₂ with HAuCl₄, followed by treatment of the intermediate products with acetic or propionic acid, or (ii) the reaction of aurates M{Au(OH)₄}₂ with the carboxylic acids. The crystal structure of Pb{Au(OCOCH₃)₄}₂·2H₂O shows that it is isostructural to the strontium salt, consisting of molecular units Pb{Au(OCOCH₃)₄}₂ with crystallographic symmetry 2. The water of crystallization forms neither coordinate bonds to a metal nor hydrogen bonds. In the analogous zinc salt the water is coordinated to the zinc atom, and the structure is a layer polymer. The two compounds that crystallize in anhydrous form. Ba{Au(OCOCH₃)₄}₂ and Pb{Au(OCOC₂H₅)₄}₂, have not yet yielded crystals suitable for X-ray analysis.
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