<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1870-249X</journal-id>
<journal-title><![CDATA[Journal of the Mexican Chemical Society]]></journal-title>
<abbrev-journal-title><![CDATA[J. Mex. Chem. Soc]]></abbrev-journal-title>
<issn>1870-249X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Química de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-249X2019000300070</article-id>
<article-id pub-id-type="doi">10.29356/jmcs.v63i3.529</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Evidence of Radical Intermediate Generated in the Electrochemical Oxidation of Iodide]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernando]]></surname>
<given-names><![CDATA[Ashantha]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Parajuli]]></surname>
<given-names><![CDATA[Suman]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barakoti]]></surname>
<given-names><![CDATA[Krishna K.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miao]]></surname>
<given-names><![CDATA[Wujian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alpuche-Aviles]]></surname>
<given-names><![CDATA[Mario A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Nevada Department of Chemistry ]]></institution>
<addr-line><![CDATA[Reno Nevada]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,The University of Southern Mississippi Department of Chemistry and Biochemistry ]]></institution>
<addr-line><![CDATA[Hattiesburg Mississippi]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Susquehanna University Department of Chemistry ]]></institution>
<addr-line><![CDATA[Selinsgrove Pennsylvania]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Arizona Western College  ]]></institution>
<addr-line><![CDATA[Yuma Arizona]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<volume>63</volume>
<numero>3</numero>
<fpage>70</fpage>
<lpage>83</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2019000300070&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2019000300070&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2019000300070&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We present evidence of the generation of radical ion formation during the oxidation of iodide on a fluorine doped tin oxide (FTO) electrode in acetonitrile. The cyclic voltammograms for the oxidation of iodide and triiodide on FTO are significantly different as in the case of the oxidation on Pt electrode. The distinct voltammetric behavior is assigned to kinetic differences on the FTO surface that require significant over potentials to drive the oxidation of iodide and triiodide. We propose that at the highly positive potentials the iodine radical intermediate, I(, becomes thermodynamically stable at FTO. The radical nature of the intermediate was verified by the formation of radicals of the usual traps of 5,5-dimethyl-1-pyrroline N-oxide (DMPO) and 2,2,5,5 tetramethyl-1-pyrroline N-oxide (TMPO) when these were added to an electrolyzed solution. Irradiation of an iodine solution causes the homolytic cleavage of I2 and yields the same radical intermediate with TMPO as in the electrolysis experiment. Similar results were obtained from the electrolysis of bromide solutions upon addition of TMPO. Short term electrolysis (&lt; 1 h) gives triiodide as a final product while long-term electrolysis (&gt; 17 h) yields additional byproducts. Byproducts were determined to be organoiodines by gas chromatography-mass spectrometry (GC-MS). Overall, our results are consistent with iodine atoms reacting with the electrolyte during electrolysis at the FTO electrode and with a sequential two-electron transfer process.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Presentamos evidencia de la generación de iones radicales durante la oxidación de ioduro sobre un electrodo de óxido de estaño dopado con flúor (FTO por sus siglas en inglés) en acetonitrilo. Los voltamogramas cíclicos para la oxidación de ioduro y triioduro en FTO son siginificativamente diferentes como es el caso de la oxidación en electrodo de platino. Éstas discrepancias son asignadas a diferencias cinéticas sobre la superficie del FTO, las cuales requieren sobrepotenciales para la oxidación de ioduro y triioduro. Proponemos que, a potenciales altmente positivos, el intermediario radical ioduro, I&#8226;, se vuelve termodinámicamente estable en FTO. La naturaleza radical del intermediario fue verificada por la formación de radicales con las trampas usuales 5,5-dimetil-1-pirrolina N-óxido (DMPO) y 2,2,5,5-tetrametil-1-pirrolina N-óxido (TMPO) cuando éstas fueron añadidas a una solución electrolizada. La irradiación de una solución de ioduro causa la ruptura homolítica de I2, y resulta en el mismo radical con TMPO que en el experimento de electrólisis. Resultados similares son obtenidos de la electrólisis de soluciones de bromuro con TMPO. La electrólisis por corto tiempo (&lt; 1 h) da triioduro como producto final, mientras que la electrólisis por largo tiempo (&gt; 17 h) resulta en productos adicionales. Se determinó que los productos adicionales son organoiodos por cromatografía de gases-espectrometría de masas (GC-MS por sus siglas en inglés). En general, nuestros resultados son consistentes con la reacción de átomos de iodo con el electrolito durante la electrólisis sobre FTO, seguido por doble transferencia de electrones.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[inner sphere]]></kwd>
<kwd lng="en"><![CDATA[iodide oxidation]]></kwd>
<kwd lng="en"><![CDATA[dye-sensitized solar cell]]></kwd>
<kwd lng="en"><![CDATA[electron transfer]]></kwd>
<kwd lng="en"><![CDATA[two electron oxidation]]></kwd>
<kwd lng="es"><![CDATA[intra-esfera]]></kwd>
<kwd lng="es"><![CDATA[oxidación de ioduro]]></kwd>
<kwd lng="es"><![CDATA[celda solar con tinte fotosensible]]></kwd>
<kwd lng="es"><![CDATA[transferencia de electrón]]></kwd>
<kwd lng="es"><![CDATA[oxidación por dos electrons]]></kwd>
</kwd-group>
</article-meta>
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