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Four novel complexes [Co(H 2 O) 4 (sul) 2 ]  1 , [Co(2-ampy) 2 (sul) 2 ]  2 , [Co(H 2 O) 2 (1,10-phen) (sul) 2 ]  3  and [Co(2,9-dimephen)(sul) 2 ]  4  (sul = sulindac, 2-ampy = 2-amino pyridine, 1,10-phen = 1,10-phenanthroline and 2,9-dimeph = 2,9-dimethyl-1,10-phenanthroline) were prepared and characterized by IR, UV–Visible spectroscopy and magnetic properties. The crystal structures of complexes  1  and  4  were determined by single-crystal X-ray diffraction. In-vitro anti-bacterial activity for the prepared complexes against Gram-positive ( Staphylococcus epidermidis, Staphylococcus aureus ) and Gram-negative ( Bordetella, Escherichia coli ) bacteria and Yeast species ( Saccharomyces and Candida ) were performed using agar well-diffusion method. Only complex  4  showed reasonable activity against yeast. All compounds showed more anti-bacterial activity against Gram-positive bacteria than Gram-negative.  Graphical abstract   This work reports synthesis, crystallographic, spectroscopic studies and biological activity of new cobalt(II) complexes with bioactive mixed sulindac and nitrogen-donor ligands. The crystal structures of complexes  1  and  4  were determined using single-crystal X-ray diffraction. In-vitro anti-bacterial activity of the prepared complexes and their parent ligands were investigated against different Gram-positive and Gram-negative bacteria using agar diffusion methodElectronic supplementary material  The online version of this article (doi:10.1186/s13065-017-0268-2) contains supplementary material, which is available to authorized users.

chemistry central journal

Synthesis, crystallographic, spectroscopic studies and biological activity of new cobalt(II) complexes with bioactive mixed sulindac and nitrogen-donor ligands