Cu(II) complex based on lemofloxacin and N,N-donor ligand: Synthesis, crystal structure, DFT calculations, and in vitro antimicrobial evaluation

•Cu(II) complex constructed from lemofloxacin and 2,2′-bipyridylamine was synthesized.•The complex was characterized using IR, UV–Vis, EPR, elemental analysis, thermal analysis and conductance measurement.•The structure was determined by single X-ray diffraction studies and DFT.•The complex distorted possess a square pyramidal geometry.•The antimicrobial study of lemofloxacin and its complex were also evaluated.