Gold Dicyanide Complexes

The luminescence of microcrystalline samples of Cs[Au(CN)2] is ascribed to planar Au-Au interactions. Low-temperature measurements of the luminescence at 458 nm show the presence of at least two states separated by 46 cm These 

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In spite of the potential basic properties of the Au(CN)2 anion, these complexes were not obtained in an acid-base reaction with silver salts. Instead, they were prepared by slow crystallization of pure gold and silver dicyanide complexes in different molar ratios (x = 0.25, 0.50, 0.75, 0.90). In the case of the two lanthanum derivatives, the exact compositions established by X-ray diffraction studies gave empirical formula in which x = 0.33 and 0.78. For the europium complexes, only one structural determination was performed with x= 0.14. 

These complexes were prepared by slow crystallization of pure gold and silver dicyanide complexes in different molar ratios therefore, they were not prepared by a conventional acid-base reaction. 

Photoluminescence studies of lanthanide ion complexes of gold and silver dicyanides a new lowdimensional solid state class for nonradiative excited-state energy transfer, Z. Assefa, G. Shankle, H. 

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