<?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>S1870-249X2005000200015</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Supramolecular Conformational Effects in the Electrocatalytic Properties of Electrostatic Assembled Films of Meso(3- and 4-Pyridyl) Isomers of Tetraruthenated Porphyrins]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mayer]]></surname>
<given-names><![CDATA[Ildemar]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Eberlin]]></surname>
<given-names><![CDATA[Marcos N.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tomazela]]></surname>
<given-names><![CDATA[Daniela M.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Toma]]></surname>
<given-names><![CDATA[Henrique E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Araki]]></surname>
<given-names><![CDATA[Koiti]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade de Sao Paulo Instituto de Química ]]></institution>
<addr-line><![CDATA[Sao Paulo ]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidade Estadual de Campinas Instituto de Química ]]></institution>
<addr-line><![CDATA[Campinas Sao Paulo]]></addr-line>
<country>Brasil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<volume>49</volume>
<numero>2</numero>
<fpage>180</fpage>
<lpage>187</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2005000200015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2005000200015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2005000200015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Meso(3- and 4-pyridyl)porphyrins coordinated to four [Ru(bipy)2Cl]+ complexes, M(3-TRPyP) or M(4-TRPyP), where M=2H+ and Zn2+, have been obtained and characterized by electrochemistry, spectroscopy and mass spectrometry. Layer-by-layer electrostatic assembled films with tetrasulfonated phthalocyaninatecuprate(II) anion, CuTSPc, displayed distinct electrocatalytic activity towards sulfite and nitrite oxidation. In general, the films derived from the M(4-TRPyP) isomers are more effective for the oxidation of nitrite, whereas those containing the M(3-TRPyP) isomers are more efficient for the oxidation of sulfite. The results demonstrated the influence of molecular geometry on the active sites of porphyrinic nanomaterials, enhancing the electron-transfer process in the M(3-TRPyP) derivative. This effect results from changes in the chemical environment around the active sites, induced by the contrasting molecular packing interactions with CuTSPc.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Meso (&#1047;- e 4-piridil)porfirinas coordenadas a quatro complexos [Ru(bipy)2Cl]+, M(3-TRPyP) e M(4-TRPyP), onde M = 2H+ e Zn2+, foram obtidas e caracterizadas por métodos eletroquímicos, espectroscopia e espectrometria de massas. Os filmes eletrostaticamente montados camada por camada com ftalocianina de cobre tetrassulfonada, CuTSPc, apresentaram atividade eletrocatalítica diferenciada para a oxidação de sulfito e nitrito. Em geral, os filmes derivados dos isômeros M(4-TRPyP) são mais ativos para a oxidação de nitrito, enquanto aqueles contendo os isômeros M(3-TRPyP) são mais eficientes para a oxidação de sulfito. Os resultados revelaram uma influência significativa da geometria molecular no sítio ativo dos nanomateriais porfirínicos, que favorece os processos de transferência eletrônica nos derivados de M(3-TRPyP), através de mudanças no empacotamento molecular com a CuTSPc.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[supramolecular chemistry]]></kwd>
<kwd lng="en"><![CDATA[metalloporphyrins]]></kwd>
<kwd lng="en"><![CDATA[electrostatic assembled films]]></kwd>
<kwd lng="en"><![CDATA[electrocatalysis]]></kwd>
<kwd lng="en"><![CDATA[electrochemistry]]></kwd>
<kwd lng="en"><![CDATA[mass spectrometry]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Article</font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="4"><b>Supramolecular Conformational Effects in the Electrocatalytic Properties of Electrostatic Assembled Films of <i>Meso</i>(3&#45; and 4&#45;Pyridyl) Isomers of Tetraruthenated Porphyrins</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>Ildemar Mayer<sup>a</sup>, Marcos N. Eberlin<sup>b</sup> , Daniela M. Tomazela<sup>b</sup> , Henrique E. Toma<sup>a</sup> and Koiti Araki<sup>*,a</sup></b></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>a </sup>Instituto de Qu&iacute;mica, Universidade de S&atilde;o Paulo, CP 26077, 05513&#45;970 S&atilde;o Paulo &#45; SP, Brazil</i>. * e-mail: <a href="mailto:koiaraki@iq.usp.br">koiaraki@iq.usp.br</a></font></p>      <p align="justify"><font face="verdana" size="2"><i><sup>b </sup>Instituto de Qu&iacute;mica, Universidade Estadual de Campinas, CP 6154, 13083&#45;970 Campinas &#45; SP, Brazil</i></font></p>  	    <p>&nbsp;</p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Received: November 17, 2004    <br> 	Published on the web: April 6, 2005</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Meso(3&#45; and 4&#45;pyridyl)porphyrins coordinated to four &#91;Ru(bipy)<sub>2</sub>Cl&#93;<sup>+</sup> complexes, M(3&#45;TRPyP) or M(4&#45;TRPyP), where M=2H<sup>+</sup> and Zn<sup>2+</sup>, have been obtained and characterized by electrochemistry, spectroscopy and mass spectrometry. Layer&#45;by&#45;layer electrostatic assembled films with tetrasulfonated phthalocyaninatecuprate(II) anion, CuTSPc, displayed distinct electrocatalytic activity towards sulfite and nitrite oxidation. In general, the films derived from the M(4&#45;TRPyP) isomers are more effective for the oxidation of nitrite, whereas those containing the M(3&#45;TRPyP) isomers are more efficient for the oxidation of sulfite. The results demonstrated the influence of molecular geometry on the active sites of porphyrinic nanomaterials, enhancing the electron&#45;transfer process in the M(3&#45;TRPyP) derivative. This effect results from changes in the chemical environment around the active sites, induced by the contrasting molecular packing interactions with CuTSPc.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> supramolecular chemistry, metalloporphyrins, electrostatic assembled films, electrocatalysis, electrochemistry, mass spectrometry</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumo</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Meso</i> (&#1047;&#45; e 4&#45;piridil)porfirinas coordenadas a quatro complexos &#91;Ru(bipy)<sub>2</sub>Cl&#93;<sup>+</sup>, M(3&#45;TRPyP) e M(4&#45;TRPyP), onde M = 2H<sup>+</sup> e Zn<sup>2+</sup>, foram obtidas e caracterizadas por m&eacute;todos eletroqu&iacute;micos, espectroscopia e espectrometria de massas. Os filmes eletrostaticamente montados camada por camada com ftalocianina de cobre tetrassulfonada, CuTSPc, apresentaram atividade eletrocatal&iacute;tica diferenciada para a oxida&ccedil;&atilde;o de sulfito e nitrito. Em geral, os filmes derivados dos is&ocirc;meros M(4&#45;TRPyP) s&atilde;o mais ativos para a oxida&ccedil;&atilde;o de nitrito, enquanto aqueles contendo os is&ocirc;meros M(3&#45;TRPyP) s&atilde;o mais eficientes para a oxida&ccedil;&atilde;o de sulfito. Os resultados revelaram uma influ&ecirc;ncia significativa da geometria molecular no s&iacute;tio ativo dos nanomateriais porfir&iacute;nicos, que favorece os processos de transfer&ecirc;ncia eletr&ocirc;nica nos derivados de M(3&#45;TRPyP), atrav&eacute;s de mudan&ccedil;as no empacotamento molecular com a CuTSPc.</font></p>  	    <p>&nbsp;</p>  	    ]]></body>
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