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  1. Monatshefte für Chemie - Chemical Monthly
  2. Monatshefte für Chemie - Chemical Monthly : Volume 144
  3. Monatshefte für Chemie - Chemical Monthly : Volume 144, Issue 2, February 2013
  4. Study of ellagic acid electro-oxidation mechanism
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Monatshefte für Chemie - Chemical Monthly : Volume 148
Monatshefte für Chemie - Chemical Monthly : Volume 147
Monatshefte für Chemie - Chemical Monthly : Volume 146
Monatshefte für Chemie - Chemical Monthly : Volume 145
Monatshefte für Chemie - Chemical Monthly : Volume 144
Monatshefte für Chemie - Chemical Monthly : Volume 144, Issue 12, December 2013
Monatshefte für Chemie - Chemical Monthly : Volume 144, Issue 11, November 2013
Monatshefte für Chemie - Chemical Monthly : Volume 144, Issue 10, October 2013
Monatshefte für Chemie - Chemical Monthly : Volume 144, Issue 9, September 2013
Monatshefte für Chemie - Chemical Monthly : Volume 144, Issue 8, August 2013
Monatshefte für Chemie - Chemical Monthly : Volume 144, Issue 7, July 2013
Monatshefte für Chemie - Chemical Monthly : Volume 144, Issue 6, June 2013
Monatshefte für Chemie - Chemical Monthly : Volume 144, Issue 5, May 2013
Monatshefte für Chemie - Chemical Monthly : Volume 144, Issue 4, April 2013
Monatshefte für Chemie - Chemical Monthly : Volume 144, Issue 3, March 2013
Monatshefte für Chemie - Chemical Monthly : Volume 144, Issue 2, February 2013
Thermodynamic analysis of solubility data 1: phase diagrams of systems salt hydrate + water
Sulfate-selective electrode based on a bis-thiourea ionophore
Study of ellagic acid electro-oxidation mechanism
Synthesis and characterization of poly(acrylic acid)-g-sodium alginate hydrogel initiated by gamma irradiation for controlled release of chlortetracycline HCl
Tuning the selectivity of two fluorescent probes to Cr(III) and Pb(II)
Influence of multiwalled carbon nanotubes on reaction kinetics of epoxy cured with 1,4-bis(3-aminopropoxy)butane
Hydrodebromination of 2,4,6-tribromophenol in aqueous solution using Devarda’s alloy
Radical transformations of some N-alkylanilines by their oxidation with different agents: an EPR study
Synthesis and characterization of [7-(trifluoromethyl)quinolin-4-yl]oxy-substituted phthalocyanines
Poly(4-vinylpyridinium bromochromate): an efficient reagent for bromination of aromatic compounds
Asymmetric synthesis of new chiral 1,2- and 1,3-diols
A general and efficient method for synthesis of enaminones and enamino esters catalyzed by NbCl5 under solvent-free conditions
Diastereoselective three-component Mannich reaction catalyzed by silica-supported ferric hydrogensulfate
Homoallenyl azines in criss-cross cycloaddition reactions
4H,8H-Pyrano[2,3-f]chromene-4,8-diones as versatile precursors for the synthesis of 6-(1,2-oxazol-5-yl)-2H-chromene-2-ones
Synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles in water using p-dodecylbenzenesulfonic acid as catalyst
One-pot synthesis of highly functionalized 2H-pyrimido[1,2-a]benzimidazoles
Efficient synthesis and insecticidal activity of novel pyridin-3-yl-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles
Regioselective synthesis of 3,5-diaryl-4-methylisoxazoles
Solvent-free catalytic preparation of 1,1-diacetates using a silica-supported functional ionic liquid as catalyst
Supported ionic-liquid layer on polystyrene–TEMPO resin: a highly efficient catalyst for selective oxidation of activated alcohols with molecular oxygen
Glucosides of morphine derivatives: synthesis and characterization
Novel transformations of 1H-isothiochromen-4(3H)-one 2,2-dioxide
Monatshefte für Chemie - Chemical Monthly : Volume 144, Issue 1, January 2013
Monatshefte für Chemie - Chemical Monthly : Volume 143
Monatshefte für Chemie - Chemical Monthly : Volume 142
Monatshefte für Chemie - Chemical Monthly : Volume 141
Monatshefte für Chemie - Chemical Monthly : Volume 140
Monatshefte für Chemie - Chemical Monthly : Volume 139
Monatshefte für Chemie - Chemical Monthly : Volume 138
Monatshefte für Chemie - Chemical Monthly : Volume 137
Monatshefte für Chemie - Chemical Monthly : Volume 136
Monatshefte für Chemie - Chemical Monthly : Volume 135
Monatshefte für Chemie - Chemical Monthly : Volume 134
Monatshefte für Chemie - Chemical Monthly : Volume 133
Monatshefte für Chemie - Chemical Monthly : Volume 132
Monatshefte für Chemie - Chemical Monthly : Volume 131
Monatshefte für Chemie - Chemical Monthly : Volume 130
Monatshefte für Chemie - Chemical Monthly : Volume 129
Monatshefte für Chemie - Chemical Monthly : Volume 128

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Study of ellagic acid electro-oxidation mechanism

Content Provider SpringerLink
Author Simić, Aleksandra Z. Verbić, Tatjana Ž. Sentić, Milica N. Vojić, Mirjana P. Juranić, Ivan O. Majlović, Dragan D.
Copyright Year 2012
Abstract Ellagic acid is a biologically active polyphenol found in numerous fruits and vegetables. However, not many papers dealing with the electrochemical properties and protolytic equilibria of ellagic acid have been published so far. The electro-oxidation mechanism of ellagic acid was studied in methanol aqueous media (1:1, v/v) within the pH range of 1.5–9.0, t = 25 ± 1 °C, using cyclic voltammetry on a glassy carbon electrode, and by semiempirical calculations. Results show that oxidation of ellagic acid is a pH-dependent, two-step quasireversible process. The slope of peak 1 indicates the exchange of the same number of electrons and protons within the whole studied pH range; the slope of peak 2 changes with the increase of pH, and three different regions are visible. As protolytic equilibria studies revealed that ellagic acid acts as a diprotic acid in the studied conditions (acidity constants were potentiometrically determined as pK a1 = 5.42 ± 0.01 and pK a2 = 6.76 ± 0.01), it is obvious that the electro-oxidation occurs at the hydroxyl group subjected to dissociation. The three different regions are therefore recognized as regions with different dominating species: unionized molecule (H4A), monoanion (H3A−), and dianion (H2A2−). UV/Vis spectral changes confirmed the proposed equilibria. Heat of formation and electron densities calculated at semiempirical level were used to propose the hydrogen and electron abstraction sites. According to the obtained results, a new mechanism of ellagic acid electro-oxidation is proposed.
Starting Page 121
Ending Page 128
Page Count 8
File Format PDF
ISSN 00269247
Journal Monatshefte für Chemie - Chemical Monthly
Volume Number 144
Issue Number 2
e-ISSN 14344475
Language English
Publisher Springer Vienna
Publisher Date 2012-10-18
Publisher Place Vienna
Access Restriction One Nation One Subscription (ONOS)
Subject Keyword Acidity constants Cyclic voltammetry Potentiometry Semiempirical calculations UV/Vis spectroscopy Chemistry/Food Science Organic Chemistry Inorganic Chemistry Analytical Chemistry Physical Chemistry Theoretical and Computational Chemistry
Content Type Text
Resource Type Article
Subject Chemistry
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