The salts K[AuCl2(CN)2]·H2O (1), K[AuBr2(CN)2]·2H2O (2) and K[AuI2(CN)2]·⅓H2O (3) were synthesized and structurally characterized. Compound 1 crystallizes as a network of square planar [AuCl2(CN)2]− anions separated by K+ cations. However, 2 and 3 feature 2-D sheets built by the aggregation of [AuX2(CN)2]− anions via weak, intermolecular X⋯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]− and [AuX2(CN)2]− anions form 2-D sheets via weak, intermolecular AuI⋯X and AuI⋯AuI interactions. In the case of 5, a rare unsupported AuI⋯AuIII interaction of 3.5796(5) Å is also seen between the two anionic units. Despite the presence of Au(I) aurophilic interactions of 3.24–3.45 Å, neither 4 nor 5 exhibit any detectable emission at room temperature, suggesting that the presence of AuI⋯X or AuI⋯AuIII interactions may affect the emissive properties.
You have access to this article
Please wait while we load your content...
Something went wrong. Try again?