Ball milling: a green mechanochemical approach for synthesis of Ni(II), Co (II) and Cu (II) complexes

A series of Ni (II), Co (II) and Cu (II) complexes were synthesized with excellent yields via a one-pot ball milling chelation reaction of those metals and beta-diketone. The process offers numerous advantages, such as better yield, short reaction time and mild reaction conditions. The computational studying was estimated to approve the geometry of the isolated solid compounds by applying density functional theory. The synthesized compounds were interpreted by using various spectroscopic techniques [infrared (IR), H-1-NMR, C-13-NMR, UV-visible, electron spin resonance (ESR) and mass spectrometry] together with some physical studies (molar conductance and magnetic susceptibility). The outcomes data displayed that the (HD1), (HD2) and (HD3) acted as neutral and/or mononegative bidentate ligands. The ESR as well as electronic spectra suggested the octahedral configuration for all isolated complexes, expect [Cu(HD2)OAc)2]center dot 2H(2)O has square planar structure. Also, the in vitro antimicrobial assay was done by using the well diffusion method for HD1, HD2, HD3 and their complexes.