Transition-metal complexes of N,N `-di (4-bromophenyl)-4-hydroxycoumarin-3-carboximidamide: synthesis, characterization, biological activities, ADMET and drug-likeness analysis

Coordination compounds of N,N'-di(4-bromophenyl)-4-hydroxycoumarin-3-carboximidamide (L1) were synthesized via the reaction of Cu (II), Co (II) and Zn (II) salts in molar ratio 1 : 1 in the presence of ammoniac as basic media. The Ligands and the complexes formed were characterized using FT-IR, UV-visible and fluorescence spectrophotometric analyses, mass spectrometry, elemental analyses and NMR spectroscopy. It was concluded that N,N'-di(4-bromophenyl)-4-hydroxycoumarin-3-carboximidamide (L1) coordinated as a mono ligand for all the complexes; it also coordinated via the -OH and -NH groups. The electrochemical behaviour of these compounds was determined by cyclic voltammetry. The synthesized compounds were screened for their antimicrobial and antioxidant activities. All the complexes except that of copper show good activities against the S. aureus and those of cobalt and zinc have very interesting diameters of inhibition but lower antioxidant activity than the ligand L1. Parameters drug-likeness and ADMET (Absorption, Distribution, Metabolism, and Excretion) properties have been calculated.