Crystal structure of novel [Ni(2aepy)(2ampy)Cl(H2O)]Cl·H2O complex comprising both 2-aminoethylpyridine (2aepy) and 2-aminomethylpyridine (2ampy) ligands within the coordination sphere and comparison of its thermal properties with analogous Ni(II) complexes with 2ampy and 2aepy ligands

Abstract

Nickel(II) chloride in the presence of both 2ampy and 2aepy yielded a novel heteroleptic complex [Ni(2aepy)(2ampy)Cl(H2O)]Cl·H2O (1). Its ionic crystal structure is built up of complex cations [Ni(2aepy)(2ampy)Cl(H2O)]+, chloride anions and water solvate molecules. Within the complex cation both 2ampy and 2aepy are coordinated to the Ni(II) atom and its hexacoordination is completed by chlorido and aqua ligands. The supramolecular structure of 1 is built up of 2D hydrogen bonded system. Thermal properties of 1 and two additional analogous nickel(II) complexes, namely [Ni(2ampy)2(H2O)2]Cl2 (2), and [Ni(2aepy)2Cl(H2O)]Cl·H2O (3) were studied in air up to 800 °C. Analysis of the weight losses coupled with MS analyses of the evolved gases and with IR study of the solid intermediates have shown that the thermal decompositions of all complexes 1–3 start with dehydration and continues by decomposition of the aminoalkylpyridine ligands. Only in the case of 2 formation of dehydrated compound [Ni(2ampy)2Cl2] is indicated. The order of the thermal stabilities of the respective complexes is 3 > 2 > 1 according to the starting temperatures of dehydration.