A novel copper(II)-Schiff base complex containing pyrrole ring: Synthesis, characterization and its modified electrodes applied in oxidation of aliphatic alcohols

Abstract

International audienceA new copper(II) complex Cu(II)-L containing N2O2 donor atoms has been prepared from 6-[3′-(N-pyrrol)propoxy]-2-hydroxyacetophenone and diaminoethane in the presence of copper acetate monohydrate. It was characterized by spectroscopic methods such as FT-IR, UV-vis, mass spectra, elemental analysis and cyclic voltammetry. The molecular structure of Cu(II)-L has also been confirmed by X-ray diffraction analysis. The electrochemical behavior of copper(II)-Schiff base complex containing pyrrol groups has been investigated in DMF and acetonitrile solutions using cyclic voltammetry. Thus, conducting polymeric films of polypyrrole were obtained on the surfaces of glassy carbon and ITO electrodes using copper(II) complex as monomer. The modified electrodes were electrochemically and morphologically characterized and their electrocatalytic properties in heterogeneous phase have also been investigated. The AFM studies show that the morphology of polypyrrole (PPy) films on ITO-electrodes depends on the number of cyclical scans. The electrocatalytic performances of this complex seem to be more efficient towards the electro-oxidation of isopropylic alcohol than any other kinds of alcohols such as methanol, ethanol and benzyl alcohol. The electro-reduction of carbon dioxide was also examined

Novel metal complexes of 3‐acetylcoumarin‐2‐hydrazinobenzothiazole Schiff base: Design, structural characterizations, DNA binding, DFT calculations, molecular docking and biological studies

“…The third peak at E pa = + 0.284 V may be assigned to oxidation of Cu (II)/Cu (III). The peak‐to‐peak separation of 60 mV indicates the reversible behavior of the Cu (II)/(I), Cu(I)/Cu (II) and Cu (II)/Cu (III) couples 73 …”

Diethyl 2,2′-({[1,4-phenylenebis(azanediyl)]bis(methylene)}bis(1H-pyrrole-2,1-diyl))diacetate

“…The reaction of 1H-pyrrole-2-carbaldehyde with ethyl bromoproacetate resulted in the formation of ethyl(2-formyl-1H-pyrrole-1-yl)-acetate (Koriatopoulou et al, 2008;Singh & Pal, 2010). The reaction of two moles of the above with p-phenylenediamine (Yang et al, 2004;Ourari et al, 2013) gave the Schiff base. The reduction of the Schiff base (Higuchi et al, 2003;Nabipour et al, 2010) gave the the title secondary amine.…”

Crystal structure of diethyl 2,2′-[((1E,1′E)-{[(1R,4R)-cyclohexane-1,4-diyl]bis(azanylylidene)}bis(methanylylidene))bis(1H-pyrrole-2,1-diyl)]diacetate

“…For the synthesis of pyrrole ester precursors, see: Koriatopoulou et al (2008); Singh & Pal (2010). For the preparation of Schiff bases, see: Yang et al (2004); Ourari et al (2013 7Å c = 9.6492 (9) Å = 115.166 (9) = 92.105 7= 113.288 (8) V = 587.68 (10) Å 3 Z = 1 Mo K radiation = 0.09 mm À1 T = 150 K 0.4 Â 0.3 Â 0.3 mm…”