Some New Nano-sized Mononuclear Cu(II) Schiff Base Complexes: Design, Characterization, Molecular Modeling and Catalytic Potentials in Benzyl Alcohol Oxidation

Abstract

In the present contribution, some novel Cu(II) complexes were synthesized from tri-and tetradentate imine ligands. All the prepared compounds were elucidated by different physicochemical methods. Density Functional Theory calculations were carried out to explain the equilibrium geometry of the bsisnph and npisnph ligands and their Cu(II) complexes. Interaction of the synthesized ligands with Cu(II) affords nano-sized particles via TEM. The catalytic potentials of the prepared complexes has been tested within the oxidation of benzyl alcohol using an environmental friendly terminal oxidant, i.e. H 2 O 2 . The effect of various parameters, e.g. solvents, temperature and amount of catalyst was investigated. A mechanistic pathway of the catalytic oxidation was tentatively described and discussed. Graphical AbstractKeywords Cu(II) Schiff base complexes · TEM · Benzyl alcohol · Density Functional Theory · Catalytic activity · Hydrogen peroxide

Synthesis of Co(II) and Cr(III) salicylidenic Schiff base complexes derived from thiourea as precursors for nano-sized Co3O4 and Cr2O3 and their catalytic, antibacterial properties

“…Schiff base ligands are easily synthesized and form complexes with almost all metal ions. Over the past few years, there have been many reports on their applications in biology including antibacterial [1], antifungal [2], anticancer [3], antioxidant, antiinflammatory [4], antimalarial [5], antiviral activity [6] and also as catalyst in several reactions such as polymerization reaction, reduction of thionyl chloride, oxidation of organic compounds, reduction reaction of ketones, aldol reaction, Henry reaction, epoxidation of alkenes, hydrosilylation of ketones, Diels-Alder reaction [7,8]. The central metal ions in these complexes act as active sites for catalyzing chemical reactions such as oxidation of toluene.…”

Spectroscopic, textural, electrical and magnetic properties of antimicrobial nano Fe(III) Schiff base complex

“…[1][2][3] The absorption band of the C=O in the dibenzoylmethane at 1700 cm −1 persisedt even after the formation of the Schiff base ligand where the infrared spectrum of the ligand showed a stretching frequency at 1680 cm −1 , which confirmed that one of the two C=O groups only participated in the condensation. The vibrational assignments were aided by comparison with the vibrational frequencies of the related compounds.…”

“…[1][2][3] The vibration bands of ν(C=O) and ν(NH 2 ) that lay at 1680 and 3380 cm −1 at the parent ligand, respectively, were shifted to 1685 and 3312 cm −1 , respectively. This phenomenon appeared because of the coordination of azomethine nitrogen to ferric ion.…”

“…[1][2][3] Their structures can be altered by changing the organic and inorganic entities, and hence new functional materials of tailored properties can be generated. [1][2][3] Their structures can be altered by changing the organic and inorganic entities, and hence new functional materials of tailored properties can be generated.…”

Oxotitanium(IV) complexes of some bis‐unsymmetric Schiff bases: Synthesis, structural elucidation and biomedical applications

“…Mainly data are used in obtaining information about the nature of complexes in solution. [31][32][33] Thus it is evident that there are no inorganic anions present outside the coordination sphere. [12,24] Generally for transition metal complexes, which are insoluble in aqueous medium, conductance data are obtained in non-aqueous solvents.…”