Abstract
We synthesized the Schiff base ligands H2L1–H2L4 and their La(III) complexes and characterized them by the analytical and spectroscopic methods. We investigated their electrochemical and antimicrobial activity properties. The electrochemical properties of the ligands H2L1–H2L4 and their La(III) complexes were studied at the different scan rates (100 and 200 mV), different pH ranges (), and in the different solvents. The electrooxidation of the Schiff base ligands involves a reversible transfer of two electrons and two protons in solutions of pH up to 5.5, in agreement with the one-step two-electron mechanism. In solutions of pH higher than 5.5, the process of electrooxidation reaction of the Schiff base ligands and their La(III) complexes follows an ECi mechanism. The antimicrobial activities of the ligands and their complexes were studied. The thermal properties of the metal complexes were studied under nitrogen atmosphere in the range of temperature 20–1000°C.
Highlights
Schiff bases were firstly synthesized by H
The number of Schiff base complexes of the lanthanide elements is limited to a few reports [9]
Molar conductivities of the Schiff base ligands and their transition metal complexes were determined in DMF (∼10−3 M) at room temperature using a Jenway Model 4070 conductivity meter
Summary
Schiff bases were firstly synthesized by H. A large number of compounds of the type M(N2O2), M(N2S2), M(N2), and M(N4) (using the binding atom representation) have been synthesized and characterized These type complexes have been investigated because of their catalytic activity in oxygenation reactions [10], carrying out, for instance, the selective oxidation of organic substrates, such as olefins, alcohols, alkanes, and aldehydes, under mild conditions. International Journal of Inorganic Chemistry made for a fairly large number of acyclic and macrocyclic copper (II) complexes derived from Schiff bases These investigations revealed that the redox properties of copper (II) complexes are markedly influenced by structural and electronic factors [17]. We synthesized four Schiff base ligands and their La(III) complexes and characterized by the analytical and spectroscopic methods The ligands and their metal complexes show the reversible, quasireversible, and irreversible electrochemical processes. The Schiff base ligands and their La(III) complexes have the antimicrobial activity
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