The salts K[AuCl2(CN)2]·H2O (1), K[AuBr2(CN)2]·2H2O (2) and K[AuI2(CN)2]·â
H2O (3) were synthesized and structurally characterized. Compound 1 crystallizes as a network of square planar [AuCl2(CN)2]â anions separated by K+ cations. However, 2 and 3 feature 2-D sheets built by the aggregation of [AuX2(CN)2]â anions via weak, intermolecular Xâ¯X interactions. The mixed anion double salts K3[Au(CN)2]2[AuBr2(CN)2]·H2O (4) and K5[Au(CN)2]4[AuI2(CN)2]·2H2O (5) were also synthesized by cocrystallization of K[Au(CN)2] and the respective K[AuX2(CN)2] salts. Similarly to 2 and 3, the [Au(CN)2]â and [AuX2(CN)2]â anions form 2-D sheets via weak, intermolecular AuIâ¯X and AuIâ¯AuI interactions. In the case of 5, a rare unsupported AuIâ¯AuIII interaction of 3.5796(5) Ã
is also seen between the two anionic units. Despite the presence of Au(I) aurophilic interactions of 3.24â3.45 Ã
, neither 4 nor 5 exhibit any detectable emission at room temperature, suggesting that the presence of AuIâ¯X or AuIâ¯AuIII interactions may affect the emissive properties.
我们合成了 K[AuCl2(CN)2]Â-
H2O(1)、K[AuBr2(CN)2]Â-2 (2)和 K[AuI2(CN)2]Â-â (3)这三种盐,并对它们进行了结构表征。化合物 1 结晶为方形平面的[AuCl2(CN)2]â 阴离子网络,由 K+阳离子隔开。然而,化合物 2 和 3 的特征是,[AuX2(CN)2]â 阴离子通过微弱的分子间 XâX 相互作用聚集而成的二维
薄片。混合阴离子双盐 K3[Au(CN)2]2[AuBr2(CN)2]Â- (4) 和 K5[Au(CN)2]4[AuI2(CN)2]Â-2 (5) 也是通过 K[Au(CN)2] 和各自的 K[AuX2(CN)2] 盐的共晶合成的。与 2 和 3 类似,[Au(CN)2]â 和 [AuX2(CN)2]â 阴离子通过分子间微弱的 AuIâ¯X 和 AuIâ¯AuI 相互作用形成二维
薄片。在 5 的情况下,两个阴离子单元之间还出现了罕见的 3.5796(5) à 的无支撑 AuIâ¯AuIII 相互作用。尽管存在 3.24â3.45 à 的 Au(I)亲
水相互作用,但 4 和 5 在室温下均未显示出任何可检测到的发射,这表明 AuIâ¯X 或 AuIâ¯AuIII 相互作用的存在可能会影响发射特性。