Syntheses,Crystal Structures,Non-covalent Interactions and Properties of a Nickel(Ⅱ)Complex Monomer and Its Dimer

A pair of nickel(Ⅱ)complexes monomer and dimer,namely[NiCl2(L)](1)and[Ni2Cl2(L)2(μ-Cl)2](2)(L=2-morpholine-4-yl-4,6-di-pyrazol-1-yl-1,3,5-triazine),were synthesized by using L to react with NiCl2·2 H2 O at 35 and 65℃,respectively.X-ray crystal structures of complexes 1 and 2 were determined.Complex 1 is mononuclear and its nickel(Ⅱ)center resides in a distorted square-pyramidal environment with a NiN3Cl2 donor set,but complex 2 is binuclear and its nickel(Ⅱ)center shows a distorted octahedral geometry with a NiN3Cl3 donor set.In complex 2,two adjacent nickel(Ⅱ)centers are connected by two bridging chloride anions.Complexes 1 and 2 form different three-dimensional supramolecular structures through non-covalent interactions such asπ-πstacking interactions,anion-πinteractions and weak hydrogen bonds.Both complexes were further characterized by thermal gravimetric analyses and spectroscopic methods.