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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-l-yl-l,3,5-triazine),were synthesized by using L to react with NiCl2·2H2O 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 as π-π stacking interactions,anion-π interactions and weak hydrogen bonds.Both complexes were further characterized by thermal gravimetric analyses and spectroscopic methods.