Two novel 1D complexes containing the dicyanoaurate ions incorporating gold–gold and hydrogen bonding interactions

Two novel 1D complexes, [Ni(hto){Au(CN)2}2][Ni(hto)](ClO4)2 · 4H2O (hto = 1,3,6,9,11,14-hexaazatricyclo[12.2.1.16,9]octadecane, in Scheme 1.) (1) and [Co(dien)2][{Au(CN)2}3] · 2H2O (dien = diethylenetriamine) (2) have been synthesized and characterized. The crystal structure of 1 confirmed the presence of nickel (II) chains via Au–Au interactions. The coordination geometry around the six-coordinate nickel (II) ion is slightly distorted octahedral with four nitrogen atoms of the macrocycle and two nitrogen atoms of the cyanides. The presence of Au–Au interactions have effectively increased the zero dimensional coordination polymer to a one dimensional system. In the complex 2, there are one cation, three anions, and two water molecules in the asymmetric unit. These components are interconnected through a combination of aurophilic attractions and hydrogen bonds and formed 1D chains.

Graphical abstractTwo novel complexes containing dicyanoaurate(I) anions have been prepared and structurally characterized by single-crystal X-ray analysis. The structures of the complexes illustrate that aurophilic and hydrogen bonding interactions increase dimensionality, generating a 1D system. The luminescence in the solid state at room temperature have been investigated.(a)A view showing the zig-zag chains of complex 1 during to aurophilic attractions. The Au(1A)–Au(1D) distance is 3.477 Å.(b)A view of a portion of the structure of [Co(dien)2][{Au(CN)2}3] · 2H2O that shows the chains and the hydrogen bonding and gold–gold interactions.Figure optionsDownload full-size imageDownload as PowerPoint slide