A binuclear chloride bridged copper(II) complex with a modified ligand structure and different coordination environment and mononuclear cobalt(II) complexes with a pyridylpyrazole ligand: Synthesis, structure and cytotoxic activity

► Structure of binuclear copper(II) complex [L′(Cl)Cu-(μ-Cl)-Cu(pz)L′](PF6)2. ► Coordination environment of two copper atoms are different. ► Synthesis and structure of cobalt(II) complexes [Co(Cl)L]X, X = PF6−, BF4−. ► L′, a N3-coordinated ligand obtained from L, a N4-coordinated ligand. ► Cytotoxic activity of the complexes has been discussed in detail.