Cobalt(II) and Manganese(II) Complexes of Novel Schiff Bases, Synthesis, Charcterization, and Thermal, Antimicrobial, Electronic, and Catalytic Features

Abstract

Carbazoles containing two new Schiff bases (Z,Z)-N,N -bis[(9-ethyl-9H-carbazole-and their Co(II) and Mn(II) complexes were synthesized and characterized using various spectroscopic methods and thermal analysis, which gave high thermal stability results for the ligands and their cobalt complexes. The title compounds were examined for their antimicrobial and antifungal activities, which resulted in high activity values for the ligands and their manganese complexes. Oxidation reactions carried out on styrene and cyclohexene revealed that the complex compounds were the most effective catalysts for styrene oxidation, giving good selectivities than those of cyclohexene oxidation. Electronic features of the synthesized compounds were also reported within this work.

Synthesis of Some Novel Nanosized Chelates of Anchoring Bisazo Dye 5-[5-(4,6-Dioxo-2-thioxo-hexahydro-pyrimidin-5-ylazo)-naphthalen-1-ylazo]-2-mercapto-1H-pyrimidine-4,6-dione and Their Applications as Antioxidant and Antitumor Agents

“…The decomposition process occurred completely without leaving any residue, and the calculated and found weight losses were consistent, proving that the loss of the ligand occurred as gases at the specified temperature range. This confirmed our suggested ligand molecular weight …”

New Metal Complexes of Thiosemicarbazone Mannich base Ligand; Synthesis, Structural Characterisation and Biological Activity

“…Conductance measurements of the complexes in DMSO solutions indicated complexes are neutral [18]. FT-IR Spectra: The FT-IR spectrum of the free thiosemicarbazone ligand (HL) shows characteristic bands at 3442, 3371, 3263;3174, 1664, 1622, 1510 and 1198 cm -1 that are attributed to ν(NH)), ν(NH)am, ν(NH2)sy,asy, ν(C=O)ket , ν(C=N)imine, ν(C=C) aromatic and ν(C=S), respectively [19,20]. The FT-IR spectrum shows no peak around ca.…”

Synthesis of Some New Carbazole-Metal Complexes and Their Thermal, Electronic, Spectral and Catalytic Alkene Oxidation Properties

“…Formylation of 9-ethyl carbazole was done by using Vilsmeier formylating agents DMF and POCl3 (1:1), 24h reflux at 85 o C [10,30,31]. The mono aldehyde was separated by flash chromatography with ethyl acetate/hexane (1:10) as eluent.…”

“…Among alkene epoxidation reactions, styrene and cyclohexene oxidation reactions captured quite high attention due to their versatile usage as starting materials in many synthetic organic reactions. In the literature, we have previously synthesized some carbazole derived Schiff bases and examined their catalytic activity towards the oxidation reactions of both cyclohexene and styrene [10]. Schiff base complexes were and are still being examined for their catalytic activities towards many different organic reactions [11][12][13][14][15].…”