Esmail Tammari

Esmail Tammari
Persian Gulf University | PGU · Department of Chemistry

PhD in Analytical Chemistry

About

33
Publications
4,056
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585
Citations
Citations since 2016
4 Research Items
201 Citations
201620172018201920202021202205101520253035
201620172018201920202021202205101520253035
201620172018201920202021202205101520253035
201620172018201920202021202205101520253035
Additional affiliations
September 2006 - September 2014
Payame Noor University
Position
  • Faculty Member

Publications

Publications (33)
Article
Electrochemical oxidation of trimipramine in the absence and presence of 1,3 dimethyl barbituric acid as a nucleophile in aqueous solution has been studied using cyclic voltammetry and controlled-potential coulometry electrolysis. Voltammetric studies of electro-oxidation of trimipramine were realized in a range of pH 1.0 to 8.0 in the absence and...
Article
The fact that oxidation, as one of the main routes of phase I metabolism of drugs, follows by conjugation reactions, and also formation of nitrenium ion as one of the clozapine oxidation products, directed us to investigate the oxidation of clozapine (CLZ) in the presence of nucleophile. The oxidation of clozapine (CLZ) has been studied on a glassy...
Article
For the first time, we report the synthesis and utilization of a new magnetic nanocomposite, consisting of Fe3O4, β-Alanine (Ala) and Pd (Fe3O4/Ala/Pd), as a highly sensitive sensor for determination of clozapine (CLZ) at biological pH (7.2) using glassy carbon electrode. The nanocomposite structure was confirmed by Fourier transform infrared spect...
Article
The electrochemical oxidation of clozapine (CLZ) has been studied in the presence of toluenesulfinic acid (TSA) and benzenesulfinic acid (BSA) as nucleophiles in aqueous solution, using cyclic voltammetry and controlled-potential coulometry. The results indicate the participation of electrochemically produced dibenzodiazepine in the Michael additio...
Article
Electrochemical oxidation of desipramine (DES) has been studied in the presence of 4,6-dimethylpyrimidine-2-thiol (DMPT) as nucleophile in acidic medium by means of cyclic voltammetry, controlled-potential electrolysis and spectroscopic data, as diagnostic techniques. Voltammetric studies of electro-oxidation of desipramine were realized in a range...
Article
Electrochemical oxidation of acetaminophen (1) in the presence of barbituric acid (2a), 1,3-dimethyl barbituric acid (2b), 2-thiobarbituric acid (2c) and 1,3-diethyl-2-thiobarbituric acid (2d) as nucleophiles in aqueous solution has been studied using cyclic voltammetry and controlled-potential coulometry. The results indicate that the p-quinone im...
Article
The effect of solvent on the rate constant of the reaction of nitrite ion with o-quinone has been investigated by means of voltammetry and voltammogram digital simulation methods. The experimental results have been compared with theoretical calculations; the latter results are in good agreement with experimental data and confirm that the dielectric...
Article
Full-text available
The electrochemical behavior of oxidation of mesalazine drug in the presence of barbituric acid derivatives was investigated by means of cyclic voltammetry and coulometry methods. Investigation was performed in two acidic (pH 1.7) and neutral (pH 7.0) media. It was found that the mentioned reaction shows two clearly different electrochemical behavi...
Article
Full-text available
Topiramate is an antiepileptic agent, which is structurally different from the other anticonvulsants. The drug has no UV-Vis absorption or emits fluorescence. Thus for its analysis using high performance liquid chromatography (HPLC) with conventional UV or fluorescence detectors, the drug should be derivatized with a suitable reagent. In previous s...
Article
Nikel nanowire arrays were fabricated by potentiostatic electrodeposition into track-etched polycarbonate (PC) membranes. By electrochemical deposition of nickel, nanowires were grown in the single pores. The nanowires were contacted by sputtering a gold layer on top of the membrane. The distinct difference in laser ablation thresholds offers the s...
Article
A new macrocyclic chemosensor containing two naphthalene fluorophores has been synthesized. The fluorescent properties of this receptor has been studied in the presence of various metal ions such as Na(+), Ag(+), Cr(3+), Mn(2+), Fe(3+), Co(2+), Ni(2+), Cu(2+), Zn(2+), Cd(2+) and Pb(2+). When increasing concentrations of Zn(2+) ions were introduced,...
Article
In this work kinetics parameters and electrochemical mechanism for electrooxidation of acetaminophen in the absence and presence of captopril in a condition close to acetaminophen natural oxidation pathway was investigated. The electrooxidation of acetaminophen in the presence of captopril was investigated by voltammetry and coulometry methods. The...
Article
Full-text available
Electrochemical oxidation of 4-tert-butylcatechols (1) has been studied in the presence of N,N'-dimethylamino ethanthiol (3) as nucleophile in aqueous solution, using cyclic voltammetry and controlled-potential coulometry. The results indicate the quinone derived from the oxidation of 4-tert-butylcatechols (1) participates in a Michael addition rea...
Article
Most of Astragalus genus use for the production of the economically important gum, traganth. The roots of several Astragalus species present a very old and well- known drug in traditional medicine for its usage in the treatment of nephritis, diabetes, leukemia, uterine cancer and as an antiperspirant diuretic and tonic [1]. The purpose of this inve...
Article
The reaction of o-benzoquinone derived by the oxidation of catechols (1a–c) with some nucleophiles containing thiol group (2a–f) has been studied in various conditions, such as pH, nucleophile concentration, and scan rate, using cyclic voltammetry. In various conditions, based on an EC electrochemical mechanism (“E” represents an electron transfer...
Article
Full-text available
Electrochemical oxidation of catechol 1a and 4-tert-butylcatechol 1b has been studied in the presence of 1-methyl-1H-imidazole-2-thiol 3 as nucleophile in aqueous solution, using cyclic voltammetry and controlled-potential coulometry. The results indicate the participation of catechol 1a and 4-tert-butylcatechol 1b in Michael reaction with 3 to for...
Article
Electrochemical oxidation of hydroquinone and catechols has been studied in the presence of triphenylphosphine (3) as a nucleophile in water/acetonitrile (40/60) solutions using cyclic voltammetry and controlled-potential coulometry. The results indicate that quinones derived from oxidation of hydroquinone or catechols, participate in a conjugate a...
Article
Full-text available
A versatile and highly efficient procedure has been introduced for preparation of spiro pyridodipyrimidines during the investigation of the reaction of 1,3-dimethyl-6- aminouracil with isatin derivatives, ninhydrin, and acenaphthoquinone under classical or microwave-assisted solvent-free conditions.Key words: isatin, ninhydrin, acenaphtoquinone, 1,...
Article
Full-text available
Electrochemical oxidation of catechols (1a-e) has been studied in the presence of sulfite ion (3) as nucleophile in aqueous solution, using cyclic voltammetry and controlled-potential coulometry. The results indicate the participation of catechols (1a-e) in Michael reaction with 3 to form the corresponding sulphonated derivatives. Based on ECE, ECE...
Article
Full-text available
Electrochemical oxidation of hydroquinone, catechol, and some of their monosubstituted derivatives has been studied in the presence of 3-hydroxy-1H-phenalen-1-one (2) as a nucleophile in water/acetonitrile (80/20) solutions using cyclic voltammetry and controlled-potential coulometry methods. The results revealed that quinones derived from oxidatio...
Article
Full-text available
An efficient method for the synthesis of diamino-o-benzoquinone based on the Michael reaction of electrochemically generated o-benzoquinone with azide ion is described, as well as an estimation of the homogeneous rate constant (k(obs)) of the reaction of o-benzoquinone with azide ion by the digital-simulation method.
Article
Potassium ferricyanide acts as a selective oxidising agent for the oxidation of catechols even in the presence of 2-mercaptobenzoxazole, as an easily oxidisable thiol to produce related catechol thioethers.
Article
The electrochemical oxidation of catechols (1a–c) has been studied in the presence of 6-methyl-1,2,4-triazine-3-thion-5-one 3 in aqueous sodium acetate, using cyclic voltammetry and controlled-potential coulometry. A plausible mechanism for the oxidation of catechols and their reaction with 3 is presented. All the catechol derivatives (1a–c) were c...
Article
Full-text available
We describe the synthesis and kinetic evaluation of compounds from [4 + 2] alone and [4 + 2] followed by [2 + 2] cycloaddition reactions of electrochemically generated o-benzoquinone with 1,3-cyclopentadiene.
Article
The electrochemical oxidation of catechols (1a–c) has been studied in the presence of 6-methyl-1,2,4-triazine-3-thion-5-one 3 in aqueous sodium acetate, using cyclic voltammetry and controlled-potential coulometry. A plausible mechanism for the oxidation of catechols and their reaction with 3 is presented. All the catechol derivatives (1a–c) were c...
Article
Full-text available
[reaction: see text] It is demonstrated that o-quinones, generated by the electrochemically driven oxidation of the catechols (1a-d) at physiological pH, are rapidly scavenged by 2-mercaptobenzoxazole (3) to give related catecholthioethers (4a-d) via an EC electrochemical mechanism pathway. The electrochemical syntheses of 4a-d have been successful...
Article
Electrooxidation of 4-methylcatechol (1) in the presence of 1,3-dimethylbarbituric acid (2a) and 1,3-diethylthiobarbituric acid (2b) as nucleophiles has been studied in detail by cyclic voltammetry and controlled-potential coulometry. The results indicate that 1 can be oxidized to its related o-benzoquinone (1a) and without conversion to its quinon...
Article
The mechanism of the electrochemical oxidation of iodide in the presence of 4-toluenesulfinic acid was studied in an aqueous solution using cyclic voltammetry and controlled-potential coulometry. The results indicate that the anodically generated iodine reacts with 4-toluenesulfinic acid through a quasi-catalytic process. In addition, the results i...
Article
Electrochemical oxidation of catechol (1) has been studied in the presence of morpholine (2a), dimethylamine (2b) and diethylamine (2c) as nucleophile in aqueous solution, using cyclic voltammetry and controlled-potential coulometry. The results indicate that the participation of catechol (1) in Michael reaction with 2 to form the corresponding ami...
Article
Full-text available
The electrochemical oxidation mechanism of catechol (1a), 3-methylcatechol (1b) and 3-methoxycatechol (1c) in the presence of barbituric acid (3a) and 1,3-dimethylbarbituric acid (3b) as nucleophile in aqueous solution has been studied in detail by cyclic voltammetry and controlled-potential coulometry. The results indicate that 1a–1cvia an ECEC (E...

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