シアノ金(I)

解説シアン化金(Ⅰ)(gold(Ⅰ) cyanide)：AuCN(222.98)．ジシアノ金(Ⅰ)酸カリウムK[Au(CN)2]とHClとの水溶液を50 ℃ に加熱すると得られる．淡黄色の結晶．鎖状構造(…Au-CN-Au…)．密度7.14 g cm－3．水に不溶．乾燥空気中では安定だが，湿った空気中，光照射，加熱などで分解して，Auとジシアン (CN)2 になる．NH3，KOH，KCNなどの水溶液に可溶．

用途メッキ材料。

使用Electrolyte in the electroplating industry

製造方法Gold(I) cyanide may be prepared by boiling sodium aurus cyanide, Na[Au(CN)2] with hydrochloric acid:Na[Au(CN)2] + HCl AuCN + HCN + NaClThe complex cyanide, Na[Au(CN)2] is made by dissolving gold in a dilute solution of sodium cyanide in the presence of air; or by dissolution of a gold anode in a solution of sodium cyanide during electrolysis. The solution is evaporated to separate the complex, Na[Au(CN)2], which is purified by recrystallization from water. Potassium cyanide may be used instead of sodium cyanide to prepare gold(I) cyanide.

純化方法The lemon yellow powder is sparingly soluble in H2O and EtOH but soluble in aqueous NH3. It is obtained by heating H[Au(CN)2] at 110o. Wash it well with H2O and EtOH and dry it at 110o. It has an IR band at max 2239 cm -1 typical for C stretching vibration. [Glemser & Sauer Handbook of Preparative Inorg anic Chemistry (Ed. Brauer) Academic Press Vol II p 1064 1965.] CARE: may evolve HCN.