Synthesis, characterization, computational, conductometric titration and DNA binding studies of N′1,N′2-bis (3-hydroxy-5,5-dimethylcyclohex-2-en-1-ylidene) oxalohydrazide complexes

A series of Co(II), Ni(II) and Cu(II) complexes were synthesized with N'(1),N'(2)-bis (3-hydroxy-5,5-dimethylcyclohex-2-en-l-ylidene)oxalohydrazide (H4DOX). The geometry of isolated solid compounds was discussed by various spectroscopic methods. The optimized structures of complexes were confirmed by applying DFT theory. Also, the formation and association constants as well as Gibbs free energies of N'(1), N'2-bis(3-hydroxy-5,5-dimethylcyclohex-2-en-1-ylidene)oxalohydrazide complexes were estimated at 298.15 K in a mixed solvent (DMSO-EtOH). Moreover, biological activity was tested for all isolated compounds. (C) 2019 Elsevier B.V. All rights reserved.