Abstract
The mononuclear Cu(II) complex [Cu((kNN′O-HL)(H2O)2] (1) was synthesized using N-acetylpyrazine-2-carbohydrazide (H2L) and characterized by elemental analysis, IR spectroscopy, ESI-MS and single crystal X-ray crystallography. Two Fe(III) complexes derived from the same ligand viz, mononuclear [Fe((kNN′O-HL)Cl2] (2) and the binuclear [Fe(kNN′O-HL)Cl(μ-OMe)]2 (3) (synthesized as reported earlier), were also used in this study. The catalytic activity of these three complexes (1–3) was examined towards the oxidation of alcohols using tert-butyl hydroperoxide (TBHP) as oxidising agent under solvent-free microwave irradiation conditions. Primary and secondary benzyl alcohols (benzyl alcohol and 1-phenylethanol), and secondary aliphatic alcohols (cyclohexanol) were used as model substrates for this study. A comparison of their catalytic efficiency was performed. Complex 1 exhibited the highest activity in the presence of TEMPO as promoter for the oxidation of 1-phenylethanol with a maximum yield of 91.3% of acetophenone.
Highlights
Transition metal complexes play a crucial role as catalysts or catalytic precursors in various organic transformations
The efficiency of metal complexes in catalysis is highly dependent on their structural configuration and electronic properties [10,11,15,16,17,18]
Considering all the above mentioned points we present the synthesis of a new Considering all the above mentioned points we present the synthesis of a new mononuclear mononuclear Cu(II) complex
Summary
Transition metal complexes play a crucial role as catalysts or catalytic precursors in various organic transformations. The designing of new metal complexes with suitable multidentate ligands is a challenging research area aiming at finding better catalytic efficiency. Several transition metal complexes have already exhibited high catalytic activity in different organic oxidative transformations, such as oxidation of alkanes or alcohols, epoxidation, carboxylation, hydrocarboxylation, in C–C couplings, CO2 reduction, etc. The efficiency of metal complexes in catalysis is highly dependent on their structural configuration and electronic properties [10,11,15,16,17,18]. The ligands play a supporting role towards the promising catalytic performance of the metal complexes. Selection of appropriate ligands for the synthesis of new metal complex catalysts is crucial
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