Preparation, characterisation and antimicrobial activity of mixed ligand nickel(II) and copper(II) complexes of 2,4-pentanedione, salicyaldehyde and their adducts.

Authors

  • Helen Oluwatola Omoregie

Keywords:

2,4-pentanedione, salicyaldehyde, adducts, magnetochemistry, antimicrobial activity.

Abstract

Mixed ligand nickel(II) and copper(II) complexes of 2,4-pentanedione (acacH), salicyaldehyde (sal) and their 2,2'-bipyridine (bipy), ethylenediamine (en) and 1,10-phenanthroline (phen) adducts have been synthesised and characterised by metal analysis, infrared spectra, electronic spectra, magnetic susceptibility measurements and the antimicrobial activity was determined by agar-cup diffusion method. The infrared spectra of the complexes revealed that the coordination of the 2,4-pentanedione was through oxygen atom of the two carbonyl ends, that of salicyaldehyde was through the oxygen atom of the carbonyl and hydroxyl ends while the three co-ligands (2,2'-bipyridine, ethylenediamine and 1,10-phenanthroline) coordinated through the nitrogen atom. Decrease in the absorption frequency bands of the carbonyl stretching frequencies on complexation as compared with those of the free ligands suggests coordination. The room-temperature magnetic moment obtained for nickel(II) and copper(II) compounds showed that they are magnetically dilute while the ligand field spectra suggests plausible 4-and 6-coordinate geometries for these compounds. All the complexes except [Ni(sal)(acac)en] have higher antimicrobial activity than the control at higher concentrations.

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Published

2022-04-14

How to Cite

Omoregie, H. O. (2022). Preparation, characterisation and antimicrobial activity of mixed ligand nickel(II) and copper(II) complexes of 2,4-pentanedione, salicyaldehyde and their adducts. JOURNAL OF SCIENCE RESEARCH, 18(1), 7. Retrieved from http://jsribadan.ng/index.php/ojs/article/view/133