Biologically active Schiff bases containing thiophene/furan ring and their copper(II) complexes: Synthesis, spectral, nonlinear optical and density functional studies

• Published in: Journal of molecular structure 2016-09, Vol.1120, p.259-266
• Main Authors: Gündüzalp, Ayla Balaban, Özsen, İffet, Alyar, Hamit, Alyar, Saliha, Özbek, Neslihan
• Format: Article
• Language: English
• Subjects: Antibacterial activity; Bacteria; Biological activity; DFT method; Ligands; Mathematical analysis; NLO; Nonlinearity; Pseudomonas; Schiff base; Schiff bases; Spectroscopy; Thiophene/furan aldehyde
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2016.05.002

Schiff bases; 1,8-bis(thiophene-2-carboxaldimine)-p-menthane (L1) and 1,8-bis(furan-2-carboxaldimine)-p-menthane (L2) have been synthesized and characterized by elemental analysis, 1H13C NMR, UV–vis, FT-IR and LC-MS methods. 1H and 13C shielding tensors for L1 and L2 were calculated with GIAO/DFT/B3LYP/6-311++G(d,p) methods in CDCl3. The vibrational band assignments, nonlinear optical (NLO) activities, frontier molecular orbitals (FMOs) and absorption spectrum have been investigated by the same basis set. Schiff base-copper(II) complexes have been synthesized and structurally characterized with spectroscopic methods, magnetic and conductivity measurements. The spectroscopic data suggest that Schiff base ligands coordinate through azomethine-N and thiophene-S/furan-O donors (as SNNS and ONNO chelating systems) to give a tetragonal geometry around the copper(II) ions. Schiff bases and Cu(II) complexes have been screened for their biological activities on different species of pathogenic bacteria, those are, Gram positive bacteria: Bacillus subtitilus, Yersinia enterotica, Bacillus cereus, Listeria monocytogenes, Micrococcus luteus and Gram negative bacteria: Escherichia coli, Pseudomonas aeroginosa, Shigella dysenteriae, Salmonella typhi, Klebsiella pseudomonas by using microdilution technique (MIC values in mM). Biological activity results show that Cu(II) complexes have higher activities than parent ligands and metal chelation may affect significantly the antibacterial behavior of the organic ligands. Tetradentate Schiff bases; 1,8-bis(thiophene-2-carboxaldimine)-p-menthane (L1) and 1,8-bis(furan-2-carboxaldimine)-p-menthane (L2) were synthesized by the reaction of diamines with thiophene/furan aldehydes for the first time and some important spectroscopic and Nonlinear optical properties were calculated. [Display omitted] •Synthesis of tetradentate Schiff bases.•Synthesis of Cu(II) complexes.•Characterization of compounds.•Theoretical calculations.•Biological activities.