scholarly journals Electrochemical Comparison on New (Z)-5-(Azulen-1-Ylmethylene)-2-Thioxo-Thiazolidin-4-Ones

Symmetry ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 588
Author(s):  
Eleonora-Mihaela Ungureanu ◽  
Mariana Popescu (Apostoiu) ◽  
Georgiana-Luiza Tatu (Arnold) ◽  
Liviu Birzan ◽  
Raluca Isopescu ◽  
...  
Keyword(s):  
Oxidation Mechanism ◽  
Stripping Voltammetry ◽  
Rotating Disk ◽  
Differential Pulse ◽  
Rotating Disk Electrode ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes ◽  
Alkyl Groups ◽  
Rotating Disk Electrode Voltammetry ◽  
Pulse Voltammetry

Three (Z)-5-(azulen-1-ylmethylene)-2-thioxo-thiazolidin-4-ones are electrochemically characterized by cyclic voltammetry, differential pulse voltammetry, and rotating disk electrode voltammetry. The electrochemical investigations revealed that the redox potential is influenced by the number and position of the alkyl groups, and the possible oxidation mechanism is proposed. These compounds, after their immobilization on glassy carbon electrodes during oxidative electropolymerization, were examined as complexing ligands for heavy metal ions from aqueous solutions through adsorptive stripping voltammetry.

The Heavy Metals Sensing Based on 2,6-Bis(-2-(Thiophen-3-yl)Vinyl)-4-(4,6,8-Trimethylazulen-1-yl)Pyrylium Modified Electrodes

2017 ◽  
Vol 68 (11) ◽  
pp. 2509-2513
Author(s):  
Ioana Georgiana Lazar ◽  
Elena Diacu ◽  
George Octavian Buica ◽  
Eleonora Mihaela Ungureanu ◽  
Georgiana Luiza Arnold ◽  
...  
Keyword(s):  
Heavy Metal Ions ◽  
Modified Electrodes ◽  
Rotating Disk ◽  
Differential Pulse ◽  
Rotating Disk Electrode ◽  
Controlled Potential Electrolysis ◽  
Rotating Disk Electrode Voltammetry ◽  
Controlled Potential ◽  
Pulse Voltammetry

This paper focuses on electrochemical characterization of new azulene compound 2,6-bis((E)-2-(thiophen-3-yl)vinyl)-4-(4,6,8-trimethylazulen-1-yl)pyrylium (L) by cyclic voltammetry (CV), differential pulse voltammetry (DPV), rotating disk electrode voltammetry (RDE) on glassy carbon disk working electrodes. The character of redox processes was established by CV and RDE using increasing scan rates at different scan domains. PolyL modified electrodes have been prepared by scanning or controlled potential electrolysis (CPE). The complexing properties of L and polyL have been investigated towards detection of heavy metal ions by anodic stripping technique. The voltammetric curves present well defined peaks for Pb2+, Cd2+, Cu2+ and Hg2+, which can be used as analytical signals for their determination. The performances of the modified electrodes obtained at different potentials and charges have been evaluated. The best results have been obtained for Pb2+ and Cd2+ with the achievement of detection limits of 10-7 M.

Ultrasensitive Electrochemical Determination of Phosphate in water by Hydrophilic TiO2 modified Glassy Carbon Electrodes

2021 ◽  
Author(s):  
Yan Jin ◽  
Tong QI ◽  
Yuqing Ge ◽  
Jin Chen ◽  
Li juan Liang ◽  
...  
Keyword(s):  
Differential Pulse Voltammetry ◽  
Glassy Carbon ◽  
Differential Pulse ◽  
Electrochemical Determination ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes ◽  
Time Differential ◽  
Pulse Voltammetry ◽  
First Time

In this paper, ultrasensitive electrochemical determination of phosphate in water is achieved by hydrophilic TiO2 modified glassy carbon electrodes for the first time. Differential pulse voltammetry (DPV) method is proposed...

Polyazulenes Based Materials for Heavy Metal Ions Detection

2017 ◽  
Vol 68 (10) ◽  
pp. 2215-2218
Author(s):  
Alexandra Oprisanu ◽  
Ioana Georgiana Lazar ◽  
Maria Daniela Pop ◽  
Eleonora Mihaela Ungureanu ◽  
Raluca Isopescu ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Polymerization ◽  
Modified Electrodes ◽  
Functional Materials ◽  
Rotating Disk ◽  
Differential Pulse ◽  
Membered Ring ◽  
Rotating Disk Electrode ◽  
Rotating Disk Electrode Voltammetry ◽  
Metal Ions Detection

Azulene is a special monomer used to functionalize electrodes due to its high polarizability, because it makes possible spontaneous electron drift from the five-membered ring to the seven-membered ring. Our study concerns the electrochemical characterization by cyclic voltammetry, differential pulse-voltammetry and rotating disk electrode voltammetry of a new azulene monomer, 4-(5-isopropyl-3,8-dimethylazulen-1-yl)-2,6-bis((E)-2-(thiophen-2-yl)vinyl) pyridine (L). It has been used to obtain complexing modified electrodes by electrochemical polymerization. PolyL films modified electrodes have been characterized by cyclic voltammetry in ferrocene probe solution. The complexing properties of polyL based functional materials have been investigated towards heavy metals (Pb, Cd Hg, Cu) by preconcentration � anodic stripping technique.

scholarly journals Ru(terpy)-Based Conducting Polymer in Electrochemical Biosensing of Epinephrine

2021 ◽  
Vol 11 (5) ◽  
pp. 2065
Author(s):  
Francesca Meloni ◽  
Maria I. Pilo ◽  
Gavino Sanna ◽  
Nadia Spano ◽  
Antonio Zucca
Keyword(s):  
Conducting Polymer ◽  
Differential Pulse ◽  
Pharmaceutical Products ◽  
Carbon Electrodes ◽  
Cross Linking ◽  
Glassy Carbon Electrodes ◽  
Electrochemical Biosensing ◽  
Pulse Voltammetry ◽  
Tyrosinase Enzyme

A heteroleptic [Ru(terpy)2]2+ (terpy = 2,2′:6′,2″-terpyridine) complex was electrochemically polymerized to give the corresponding metal-containing conducting polymer on gold and glassy carbon electrodes. The polymerization of the Ru(II) complex was allowed by a terthiophene functionalization on one of the two terpy coordinating fragments, whereas the presence of -COOH substituents on the second terpy ligand enabled the film to immobilize a tyrosinase enzyme by cross-linking with glutaraldehyde. Then, the Ru(terpy) conducting polymer worked as a transducer as well as an immobilizing agent in the design of amperometric biosensors for the determination of epinephrine. The electrochemical behavior of enzymatic sensors containing Ru(terpy)-based conducting polymers was investigated by differential pulse voltammetry and chronoamperometry. Analytical performances and kinetic parameters were calculated, suggesting a potential application of the reported biosensors in the determination of epinephrine in pharmaceutical products.

New Azulene Modified Electrodes for Heavy Metal Sensing

2017 ◽  
Vol 68 (9) ◽  
pp. 2172-2175
Author(s):  
Maria Daniela Pop ◽  
Veronica Anastasoaie ◽  
Mariana Apostoiu Popescu ◽  
Alexandra Oprisanu ◽  
Eleonora Mihaela Ungureanu ◽  
...  
Keyword(s):  
Modified Electrodes ◽  
Rotating Disk ◽  
Differential Pulse ◽  
Rotating Disk Electrode ◽  
Controlled Potential Electrolysis ◽  
Controlled Potential ◽  
Pulse Voltammetry ◽  
Heavy Metal Sensing ◽  
Metal Sensing

The electrochemical characterization of 2,6-bis((E)-2-(furan-2-yl)vinyl)-4-(5-isopropyl-3,8-dimethylazulen-1-yl) pyridine has been performed by cyclic voltammetry, differential pulse voltammetry and rotating disk electrode. Modified electrodes were obtained by cycling the potential in the anodic scans or by controlled potential electrolysis (CPE) at different potentials and charges. The modified electrodes have been tested for mercury, cadmium, copper and lead ions detection.

scholarly journals Electroanalytical Characterisation of Dopa Decarboxylase Inhibitors Carbidopa and Benserazide on Multiwalled Carbon Nanotube and Poly(Nile blue A) Modified Glassy Carbon Electrodes

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Dilek Kul ◽  
Christopher M. A. Brett
Keyword(s):  
Differential Pulse Voltammetry ◽  
Glassy Carbon ◽  
Nile Blue ◽  
Phosphate Buffer Solution ◽  
Differential Pulse ◽  
Carbon Electrodes ◽  
Potential Cycling ◽  
Multiwalled Carbon ◽  
Glassy Carbon Electrodes ◽  
Pulse Voltammetry

Modified glassy carbon electrodes have been made by deposition of functionalised multiwalled carbon nanotubes (MWCNTs) followed by formation of poly(Nile blue) (PNB) films by electropolymerisation, using potential cycling in 0.1 M phosphate buffer solution (PBS) at pH 6.0. The electrochemical oxidation of carbidopa (CD) and benserazide (BS) on these MWCNTs/PNB-modified electrodes was investigated using cyclic and differential pulse voltammetry in 0.1 M PBS at different values of pH between 5.0 and 8.0; both CD and BS gave one diffusion-controlled irreversible oxidation peak in cyclic voltammetry. Analytical characterisation of CD and BS was carried out in 0.1 M PBS, pH 5.0. Peak currents in differential pulse voltammetry were linear over the concentration range of1×10−5to1×10−4 M for CD and4×10−6to4×10−5 M for BS. The repeatability, precision, and accuracy of the method were also investigated. Higher sensitivities and lower detection limits, of 1.17 μM for CD and 0.50 μM for BS, were obtained with this new modified electrode compared with previous studies reported in the literature.

The polarographic and voltammetric determination of 4-aminoazobenzene

1990 ◽  
Vol 55 (11) ◽  
pp. 2636-2647 ◽  
Author(s):  
Jiří Barek ◽  
Helena Kvapilová ◽  
Viktor Mejstřík ◽  
Oldřich Petira ◽  
Jiří Zima
Keyword(s):  
Differential Pulse Voltammetry ◽  
Rotating Disk ◽  
Differential Pulse ◽  
Rotating Disk Electrode ◽  
Analytical Determination ◽  
Differential Pulse Polarography ◽  
Test Substance ◽  
Polarographic Reduction ◽  
Pulse Polarography ◽  
Pulse Voltammetry

The polarographic reduction of genotoxic 4-aminoazobenzene was studied, a mechanism was proposed and conditions were found for the analytical determination using Tast polarography in the range 1 . 10-4 - 2 . 10-6 mol l-1 and differential pulse polarography in the range 1 . 10-4 - 2 . 10-7 mol l-1. The sensitivity can be further increased by using fast scan differential pulse voltammetry at a hanging mercury drop electrode combined with adsorptive accumulation of the test substance on the surface of the working electrode, permitting the determination to be carried out in the range 1 . 10-7 - 2 . 10-10 mol l-1. The anodic oxidation of 4-aminoazobenzene was also studied at a glassy carbon solid electrode and conditions were found for its analytical utilization in the range 1 . 10-4 - 2 . 10-6 mol l-1 using classical or differential pulse voltammetry at a rotating disk electrode.

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