Synthesis, Crystal Structure of Mg(II) Complex Material and itsApplication as Catalysts for A3 Coupling Reaction

The ligand of 1, 2-phenylenedioxydiacetic acid (H2L) has been employed to react with MgCl2·6H2O in water/ethanol solution (v:v = 1:1), to yield a novel Mg(II) complex (MgL(H2O)3)·3.5H2O. The complex was characterized by infrared spectroscopy and single crystal X-ray diffraction structural analysis. The results show that the Mg(II) complex belongs to monoclinic, space group C2/c with a = 2.9160(6) nm, b = 0.67617(14) nm, c = 1.7319(4) nm, β = 109.06(3)°, V = 3.2275(11) nm 3 , Z = 8, Dc= 1.562 µg·m −3 , µ = 0.184 mm −1 , F (000) = 1560, and final R1 = 0.0703, ωR2 = 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.