A hexacationic coordination compound from Co(II) and a cationic ligand derived from 4,4ʹ-bipyridine: Synthesis, characterization and investigation for biological application

Abstract A hexapositively charged tetrahedral geometry Co(II) complex was synthesized using a new positively charged ligand prepared quaternizing 4,4ʹ-bipyridine by 1-bromobutane. It is characterized by spectrometry (1H NMR, ESI MS, Uv-Vis, ICP OES), carbon, hydrogen and nitrogen (CHN) elemental analysis, halide estimation and conductivity measurement. The complex showed significantly high molar conductivity value in water (640.83 S mol−1 cm2). Its in vitro biological activities were tested on one gram-positive (Staphylococcus aureus) and one gram-negative (Klebsiella pneumoniae) bacteria. It was found active against both bacteria with improved and better activity against the latter.