This work describes the synthesis of three new mixed ligand ternary complexes of La(III) having the general formula [M(1N2N)2·(L)·2H2O] by employing 1-nitroso-2-naphthol (1N2N) primary ligand and L-valine, L-serine, L-isoleucine as secondary ligand. The complexes were characterized by thermal analysis, elemental analysis, electrical conductance, UV-visible spectrum and magnetic susceptibility measurement study. The non-electrolytic nature of the complexes was confirmed by molar conductance studies. Furthermore, the magnetic susceptibility study at room temperature showed that the lanthanum(III) complexes were diamagnetic in nature. Electronic absorption studies of the complexes also show intra-ligand and LMCT transitions, respectively. FT-IR studies confirmed the bonding between the metal ion and ligands via N-and O-donor atoms. The presence of coordinated water molecules was confirmed by thermal study. Additionally, these complexes were tested for antibacterial study by using agar cup and tube dilution method. All the complexes show moderate to good antibacterial activity.
The synthesis of mixed ligand La(III) and Ce(III) complexes with formula [M(1N2N) 2 •(L)•2H 2 O] is reported by using 1-nitroso-2-naphthol (1N2N) as a primary ligand and L-phenylalanine, L-threonine (HL) as secondary ligands. The structures of reported complexes were established by UV-Visible, infrared spectroscopic techniques, magnetic susceptibility measurements, molar conductance study, elemental analysis and thermal studies. The conductance study showed non-electrolytic nature of complexes. The thermal study was found in accordance with structure of complexes. The metal-ligand coordination was confirmed by FT-IR spectral study. Furthermore the lanthanum and cerium complexes were found diamagnetic and paramagnetic in nature respectively. The intraligand and LMCT transitions were confirmed by UV-Visible spectral study. The study to investigate antibacterial nature of compounds was done in vitro against E. coli, S. typhi, Gram-negative and S. aureus, C. diphtheria, Gram-positive bacteria.
The mixed ligand ternary complexes of cerium(III) with general formula [Ce(1N2N)2•(L)•2H2O] where (1N2N) = 1-nitroso-2-naphthol primary ligand and L = different amino acids (L-valine, L-serine and L-isoleucine) as a secondary ligands have been prepared and characterized by IR, UV-visible spectroscopic technique, TG-DTA studies, elemental analysis, magnetic and molar conductance studies. The magnetic susceptibility study indicates paramagnetic nature of the complexes. The electrical conductance values of all the complexes shows their non-electrolytic nature. The metal-ligand bonding through nitrogen and oxygen atom was confirmed by FT-IR spectral studies. The antimicrobial activities of the compounds have been tested against S. aureus, C. diphtheria, E. coli and S. typhi. These complexes show better antibacterial activity than free ligand.
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