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)(p-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 center dot 2H(2)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 as pi-pi stacking interactions, anion-pi interactions and weak hydrogen bonds. Both complexes were further characterized by thermal gravimetric analyses and spectroscopic methods.