Discovery of THICZs as Chemical Sensors: Synthesis, Spectrophotometric,Voltammetric and DFT Studies

2019 ◽  
Vol 09 ◽  
Author(s):  
Mardia T. El Sayed ◽  
Ibrahim H.I. Habib ◽  
Nermien M. Sabry ◽  
Sergey A. Pisarev ◽  
Mohamed El-Naggar ◽  
...  
Keyword(s):  
Electrochemical Behaviour ◽  
Molecular Size ◽  
Active Species ◽  
Carbon Paste ◽  
Reversible Redox ◽  
Energy Relationships ◽  
Linear Solvation Energy ◽  
Solute Interactions ◽  
Homo Lumo ◽  
Paste Electrode

Absorption spectra of tetrahydro[3,2-b]indolo-carbazoles (THICZs) with various molecular size and alkyl tails have been recorded in various solvents in the range between 200 to 600 nm. The photo physical behaviour of dissolved THICZs depends on the nature of its environment. The solvatochromic behaviours of THICZs and solvent solute interactions can be analysed by means of linear solvation energy relationships concept proposed by Kamlet and Taft. Compound 4 show excellent properties for sensing small molecules. The electrochemical behaviour of some THICZs was investigated at carbon paste electrode where two electrode reactions were involved, irreversible oxidation-one electron transfer and quasi-reversible redox reactions forming phenolic followed by quinolone moiety electro active species. The DFT-calculated molecular orbital energies (B3LYP/6-31G) and HOMO-LUMO gaps for some presented indolocarbazoles have been performed.

scholarly journals Developing an electrochemical sensor based on a carbon paste electrode modified with ZnO nanoparticles synthesized by microwave for determination of chlorpheniramine maleate

2021 ◽  
Vol 4 (01) ◽  
pp. 16-25
Author(s):  
Hamideh Asadollahzadeh
Keyword(s):  
Carbon Paste Electrode ◽  
Zno Nanoparticles ◽  
Electrochemical Behaviour ◽  
Differential Pulse ◽  
Oxidation Potential ◽  
Carbon Paste ◽  
Chlorpheniramine Maleate ◽  
Peak Current ◽  
Paste Electrode

Zinc oxide (ZnO) nanoparticles with an average size of 60 nm have been successfully prepared by microwave irradiation. Carbon paste electrode (CPE) was modified with ZnO nanoparticles and used for the electrochemical oxidation of chlorpheniramine maleate (CPM). Cyclic voltammetry (CV) study of the modified electrode indicated that the oxidation potential shifted towards a lower potential by approximately 106 mV and the peak current was enhanced by 2 fold in comparison to the bare CPE (ZnO/CPE-CV). The electrochemical behaviour was further described by characterization studies of scan rate, pH and concentration of CPM. Under the optimal conditions, the peak current was proportional to CPM concentration in the range of 8.0 ×10-7 to 1.0 × 10-3 mol L-1 with a detection limit of 5.0 × 10-7 mol L-1 by differential pulse voltammetry (DPV). The peak current of CPM is linear in the concentration range of 0.8 - 1000 µM (R2=0.998). The ZnO/CPE has good reproducibility and high stability for the determination of CPM using this electrode. The proposed method was successfully applied to the determination of CPM in pharmaceutical samples. In addition, the important analytical parameters were compared with other methods which show that ZnO/CPE-CV procedure is comparable to recently reported methods.

A novel two-dimensional layered Cu2+ complex based on Dawson-like [H3BiW18O60]6−: synthesis, structure and magnetic properties

2018 ◽  
Vol 74 (11) ◽  
pp. 1267-1273
Author(s):  
Shuai He ◽  
Ying Xin ◽  
Jiansheng Li ◽  
Zaiming Zhu ◽  
Peng Zhao ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Electrochemical Behaviour ◽  
Exchange Interactions ◽  
Antiferromagnetic Exchange ◽  
Two Dimensional ◽  
Carbon Paste ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dimensional Network ◽  
Paste Electrode

A novel complex based on the Dawson-like [H3BiW18O60]6−, i.e. (C2H9N2)2[{Cu(C10H8N2)(C2H8N2)}2(H3BiW18O60)]·5.5H2O or (enH)2[{Cu(2,2′-bipy)(en)}2(μ4-H3BiW18O60)]·5.5H2O, (1), where enH is protonated ethane-1,2-diamine, 2,2′-bipy is 2,2′-bipyridine and en is ethane-1,2-diamine, has been synthesized hydrothermally and characterized by elemental analysis, single-crystal X-ray diffraction analysis, IR spectroscopy, powder XRD, and thermogravimetry and differential thermal analysis (TG–DTA). For (1), each [H3BiW18O60]6− anion acts as a tetradentate ligand connecting [Cu(2,2′-bipy)(en)]2+ fragments via two terminal and two bridging O atoms, forming a two-dimensional network structure. Along the a and c axes, polyoxometalate units are arranged in an AB…AB manner. The electrochemical behaviour of (1)–CPE (CPE is a carbon paste electrode) was investigated in 2 M H2SO4 solution by cyclic voltammetry (CV). The redox process of WVI/V takes place at E 1/2 = −0.58 (I–I′) and −0.37 V (II–II′), and at −0.04 V (III–III′) for CuII/0. The magnetic properties of (1) were investigated in the range 2–300 K and indicated the existence of strong antiferromagnetic exchange interactions between the Cu2+ centres.

Solvatochromism Effects on the Photo-Physical Behavior of Two Triazole Compounds

2016 ◽  
Vol 230 (11) ◽  
Author(s):  
Roshanak Kian ◽  
Seyed  Masoud Seyed Ahmadian ◽  
Mohammad  Sadegh Zakerhamidi ◽  
Ghader Babaie ◽  
Parviz Nesari
Keyword(s):  
Excited States ◽  
Room Temperature ◽  
Dipole Moments ◽  
Triazole Ring ◽  
Biological Applications ◽  
Physical Behavior ◽  
Energy Relationships ◽  
Linear Solvation Energy ◽  
Solute Interactions ◽  
Molecular Skeleton

AbstractDiverse biological applications of triazole molecules, makes study of these compounds intriguing. Since, the solvent effect causes different behavior in these compounds, a quantitative study of solvent effects on photo-physical properties of two triazole compounds, with similar molecular skeleton and various substituent groups on triazole ring were studied, at room temperature. The solute's photo-physical behavior strongly depends on the solute and solvent's nature, along with the solvent-solute interactions. In order to understand the effect of intermolecular interactions on spectral behaviors of these materials, and to conceive the nature and extend of solvent-solute interactions, the spectral variations were analyzed via the linear solvation energy relationships concept, suggested by Kamlet and Taft. In addition, by means of solvatochromic method, ground and excited states dipole moments as well as dipole moment variations, from ground to excited states, were calculated, in different media.

scholarly journals A Hydrothermal Synthesis of Graphene Quantum Dots Modified Carbon Paste Electrode as an Efficient Electro Sensor Towards L-Ascorbic Acid

2019 ◽  
Vol 31 (6) ◽  
pp. 1362-1368
Author(s):  
SATHEESH DURAIRAJ ◽  
RAVICHANDRAN KULANDAIVELU
Keyword(s):  
Quantum Dots ◽  
Ascorbic Acid ◽  
Electrochemical Behaviour ◽  
Graphene Quantum Dots ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Edge Structure ◽  
Anodic Peak Current ◽  
Paste Electrode ◽  
Higher Sensitivity

The tremendous electronic assets of graphene, with its charge carriers parroting relativistic graphene quantum dots and its potential in numerous applications, have ensured a hasty evolution of interest in this ground-breaking material. The graphene quantum dots, in the size range of 1-5 nm, showed 0 D morphology, which exists with few atomic layers of wideness and have zigzag edge structure. Herein, We report on electrochemical behaviour of graphene quantum dots modified electrode that hold edges and basal plane content, accelerated the anodic peak current with a sensitivity of about 0.68 mA mM–1 and offers 1.4 times higher sensitivity towards the oxidation of ascorbic acid.

scholarly journals Electrochemical Behaviour and Determination of Baicalin on Nano-Al2O3 Modified Carbon Paste Electrode

2015 ◽  
Vol 27 (7) ◽  
pp. 2396-2400
Author(s):  
Gao-Feng Shi ◽  
Hai-Xiao Liu ◽  
Guo-Ying Wang ◽  
Jin-Mei Su ◽  
Jian Miao ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Electrochemical Behaviour ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Paste Electrode

Electrochemical behaviour of copper oxides at a carbon paste electrode. Application to the study of the superconductor YBaCuO

1991 ◽  
Vol 36 (7) ◽  
pp. 1209-1218 ◽  
Author(s):  
M.T. San José ◽  
A.M. Espinosa ◽  
M.L. Tascón ◽  
M.D. Vásquez ◽  
P. Sánchez Batanero
Keyword(s):  
Carbon Paste Electrode ◽  
Electrochemical Behaviour ◽  
Copper Oxides ◽  
Carbon Paste ◽  
Paste Electrode
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