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The ligand of 1, 2-phenylenedioxydiacetic acid (HL) has been employed to react with MgCl 2 ·6H 2 O inwater/ethanol solution (v:v = 1:1), to yield a novel Mg(II) complex [MgL(H 2 O] 3 ·3.5H 2 O. The complex was characterizedby infrared spectroscopy and single crystal X-ray diffraction structural analysis. The results show that the Mg(II) complexbelongs to monoclinic, space group  C 2  /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,  Z  = 8,  D c  = 1.562  µ g·m -3 ,  µ  = 0.184 mm,  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 heterogeneouscatalyst has been studied.

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