<?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>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2010000100010</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Bonding of water to copper atom at an almost random interaction]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales-Duarte]]></surname>
<given-names><![CDATA[A.N.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pacheco-Sánchez]]></surname>
<given-names><![CDATA[J.H.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Tecnológico de Toluca  ]]></institution>
<addr-line><![CDATA[Metepec Edo. Mex.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2010</year>
</pub-date>
<volume>56</volume>
<numero>1</numero>
<fpage>69</fpage>
<lpage>73</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2010000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2010000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2010000100010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The results of a density functional theory (DFT) study of the bonding between water and an ionized copper atom are presented through an all-electron calculation. The C1, C2v and Cs approaches of the metal atom toward the oxygen atom on H2O are investigated. The analysis shows the geometric dependency of the copper-water bonding energy in the form of approaching this metal to the water molecule. Bonding exists only in the conical region perpendicular to the plane of the water molecule with vertex in the oxygen atom. Our results suggest experimental possibilities such as copper transport in water, or preventing the copper from attaching onto the water molecule by orienting it by means of external electric fields to the directions less favorable to the reaction.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los resultados de un estudio de teoría funcional de la densidad acerca del enlace entre una molécula de agua y un átomo de cobre ionizado se presentan por medio de un cálculo todo-electrón. Se investigan aproximaciones C1, C2v, y Cs del átomo de metal al átomo de oxígeno en H2O. El análisis muestra la dependencia geométrica de la energía de enlace agua-cobre en la forma de aproximar este metal a la molécula de agua. El enlace existe solo en la región cónica perpendicular al plano de la molécula de agua con vértice en el átomo de oxígeno. Nuestros resultados sugieren posibilidades experimentales tales como transporte de cobre, o prevención del ataque del cobre a la molécula de agua orientándola por medio de campos eléctricos externos a la dirección menos favorable a la reacción.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Atomic bonding]]></kwd>
<kwd lng="en"><![CDATA[potential energy curves]]></kwd>
<kwd lng="en"><![CDATA[density functional theory]]></kwd>
<kwd lng="en"><![CDATA[metal-molecule geometric approach]]></kwd>
<kwd lng="es"><![CDATA[Enlace atómico]]></kwd>
<kwd lng="es"><![CDATA[curvas de energía potencial]]></kwd>
<kwd lng="es"><![CDATA[teoría funcional de la densidad]]></kwd>
<kwd lng="es"><![CDATA[proximación geométrica metal-molécula]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Bonding of water to copper atom at an almost random interaction</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>A.N. Morales&#150;Duarte and J.H. Pacheco&#150;S&aacute;nchez</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Instituto Tecnol&oacute;gico de Toluca, Av. Tecnol&oacute;gico s/n, 52140 Metepec, Edo. Mex., M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 25 de septiembre de 2009    <br>   Aceptado el 11 de enero de 2010</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">The results of a density functional theory (DFT) study of the bonding between water and an ionized copper atom are presented through an all&#150;electron calculation. The C<sub>1</sub>, <i>C</i><sub>2</sub><i><sub>v</sub> </i>and <i>C<sub>s</sub> </i>approaches of the metal atom toward the oxygen atom on <i>H<sub>2</sub>O </i>are investigated. The analysis shows the geometric dependency of the copper&#150;water bonding energy in the form of approaching this metal to the water molecule. Bonding exists only in the conical region perpendicular to the plane of the water molecule with vertex in the oxygen atom. Our results suggest experimental possibilities such as copper transport in water, or preventing the copper from attaching onto the water molecule by orienting it by means of external electric fields to the directions less favorable to the reaction.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Atomic bonding; potential energy curves; density functional theory; metal&#150;molecule geometric approach.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Los resultados de un estudio de teor&iacute;a funcional de la densidad acerca del enlace entre una mol&eacute;cula de agua y un &aacute;tomo de cobre ionizado se presentan por medio de un c&aacute;lculo todo&#150;electr&oacute;n. Se investigan aproximaciones C<sub>1</sub>, C<sub>2</sub><i><sub>v</sub></i>, y C<i><sub>s</sub></i> del &aacute;tomo de metal al &aacute;tomo de ox&iacute;geno en <i>H<sub>2</sub>O</i>. El an&aacute;lisis muestra la dependencia geom&eacute;trica de la energ&iacute;a de enlace agua&#150;cobre en la forma de aproximar este metal a la mol&eacute;cula de agua. El enlace existe solo en la regi&oacute;n c&oacute;nica perpendicular al plano de la mol&eacute;cula de agua con v&eacute;rtice en el &aacute;tomo de ox&iacute;geno. Nuestros resultados sugieren posibilidades experimentales tales como transporte de cobre, o prevenci&oacute;n del ataque del cobre a la mol&eacute;cula de agua orient&aacute;ndola por medio de campos el&eacute;ctricos externos a la direcci&oacute;n menos favorable a la reacci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Enlace at&oacute;mico; curvas de energ&iacute;a potencial; teor&iacute;a funcional de la densidad; aproximaci&oacute;n geom&eacute;trica metal&#150;mol&eacute;cula.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS:71.15.Mb;33.15.Fm</font></p>     ]]></body>
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