, F (000) = 1560, and final R 1 = 0.0703, ωR 2 = 0.2256. The complex molecules form a 3D network structure through hydrogen bonds and π-π stack. The A 3 coupling reaction of phenylacetylene, aldehyde and amine (piperidine) in the presence of Au@Mg(II) complex as an efficient heterogeneous catalyst has been studied.