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Novel cobalt, nickel and copper complexes were synthesized by regular reflux method and nano sized Co(II), Ni(II) and Cu(II) metal complexes were synthesized by a facile hydrothermal method using green solvent at various temperatures without the addition of any capping agent. The structural characterization was done by magnetic susceptibility, molar conductance, elemental analysis, thermal analysis, FT-IR, 1 H NMR, 13 C NMR, ESI mass, UV-Visible analysis. The morphology and size of the nano metal complexes were determined using FE-Scanning electron microscopy, powder X-ray diffraction data and atomic force microscopic techniques. All the spectral and analytical results reveal 1:2 metal to ligand ratios having [ML 2 (H 2 O) 2 ] stoichiometry, here M=Co(II), Ni (II) and Cu(II), L=deprotonated ligand. The non-electrolytic nature of the compound was confirmed by molar conductance experiment. The synthesized Schiff base and its metal complexes (7, 8 and 9) were tested for their biological activity. All the tested compounds exhibit decent anticancer and DNA cleavage activity and copper complex shows better activity results than other tested compounds.