Erbium(III) complexes of 2-hydroxy-l,4-naphthalenedione-1-oxime and its C-3 substituted
derivatives are synthesized and characterized by elemental analysis, thermogravimetric analysis, infrared
spectroscopy, magnetic susceptibility measurements 2-hydroxy-1,4-naphthalenedione-1-oxime derivatives are analysed using H1 and C13 NMR spectroscopy. The molecular composition of the synthesized
complexes is found to be [ML3(H2O)2]. The antimicrobial activity of these complexes is determined by well
diffusion method against the target microorganisms- Staphylococcus aureus, Xanthomonas campestris,
Pseudomonas aeruginosa, Candida albicans and Aspergillus niger. The antimicrobial activities of 2-
hydroxy-1,4-naphthalenedione-1-oximes and their complexes are compared. It is observed that 2-hydroxy-1,4-naphthalenedione-l-oximes exhibit higher antifungal activity as compared to antibacterial activity.
These activities are reduced upon complexation of these oximes with Erbium.