Synthesis, Crystal Structures, Hirshfeld Surface Analysis, and Magnetic Properties of Two Cu/Ni Schiff-Base Complexes

Two novel complexes, namely [Cu-2(L)(2)] (1) and [Ni-4(L)(4)] (2, H2L = 1-{3-[(5-bromo-2-hydroxy-benzylidene)-amino]-2-hydroxyphenyl}-ethanone) were synthesized through solvothermal methods at the same condition. The complexes 1 and 2 were characterized by IR spectroscopy, elemental analysis and single-crystal X-ray diffraction. 1 is dinuclear copper complex while 2 is a cubane nickel cluster. The L ligand displays two different coordination modes. One is the mu(1)-L-kappa N-3(1):O-1:N-2 coordination mode and the other is mu(3)-L-kappa O-6(1):O-2:O-2:O-2:N-1:O-3 coordination mode. Magnetic studies reveal that the complex 2 displays dominant antiferromagnetic intracluster interactions between the Ni-II ions through the mu(3) oxide bridges with g = 2.29, J = - 0.939 cm(-1), and zJ ' = - 0.333 cm(-1). Hirshfeld surface analysis revealed that H center dot center dot center dot H interaction was the dominant intermolecular interaction.