Английская Википедия:Chloro(dimethyl sulfide)gold(I)
Chloro(dimethyl sulfide)gold(I) is a coordination complex of gold. It is a white solid. This compound is a common entry point into gold chemistry.
Structure
As for many other gold(I) complexes, the compound adopts a nearly linear (176.9°) geometry about the central gold atom. The Au-S bond distance is 2.271(2) Å, which is similar to other gold(I)-sulfur bonds.[1]
Preparation
Chloro(dimethyl sulfide)gold(I) is commercially available. It may be prepared by dissolving gold in aqua regia (to give chloroauric acid), followed by addition of dimethyl sulfide.[2] Alternatively, sodium tetrachloroaurate may be used as the source of gold(III).[3] The bromo analog, Me2SAuBr, has also been synthesized by a similar route.[4] An approximate equation is:
- HAuCl4 + 2 SMe2 + H2O → Me2SAuCl + 3 HCl + OSMe2
A simple preparation starts from elemental gold in DMSO / conc HCl (1:2) where DMSO acts as an oxidant and the formed Me2S as ligand. As a side product, HAuCl4·2DMSO is formed.[5]
Reactions
In chloro(dimethyl sulfide)gold(I), the dimethyl sulfide ligand is easily displaced by other ligands:[6]
- Me2SAuCl + L → LAuCl + Me2S (L = ligand)
Since Me2S is volatile, the new complex LAuCl is often easily purified.
When exposed to light, heat, or air, the compound decomposes to elemental gold.
References
Шаблон:Reflist Шаблон:Gold compounds
