<?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>S1870-249X2019000400132</article-id>
<article-id pub-id-type="doi">10.29356/jmcs.v63i4.794</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[UV Spectrophotometric Determination of Thermodynamic Dissociation Constants of Some Aromatic Hydrazones in Acid Media]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jankulovska]]></surname>
<given-names><![CDATA[Mirjana S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Spirevska]]></surname>
<given-names><![CDATA[Ilinka]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dimova]]></surname>
<given-names><![CDATA[Vesna]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jankulovska]]></surname>
<given-names><![CDATA[Milena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Cyril and Methodius University Faculty of Agricultural Sciences and Food in Skopje ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Macedonia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Cyril and Methodius University Faculty of Natural Sciences and Mathematics in Skopje ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Macedonia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Cyril and Methodius University Faculty of Technology and Metallurgy in Skopje ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Macedonia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,University Ss. Kliment Ohridski Chemical-Bromatological-Toxicological Analysis Laboratory ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Macedonia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>63</volume>
<numero>4</numero>
<fpage>132</fpage>
<lpage>145</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2019000400132&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2019000400132&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2019000400132&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract. The spectral behavior of some p-nitro-p-substituted benzoylhydrazones in the perchloric acid media was followed, applying the UV spectroscopy. The position of the absorption maximum in the spectra was defined in acidic media and the electronic transitions were discussed, as well (1&lt;pH&lt;7). The equilibrium between neutral and protonated form was investigated in the ethanol-water (V/V, 1:1) solutions. The observed changes in the UV spectra suggested that protonation process took place in one step. The pH region of protonation ranges between 1.4 and 2.9. Using the changes in the UV spectra which appear as a result of the protonation reaction the stoichiometric dissociation constants were determined numerically (pKBH+ = n·pH + logI) and graphically (intercept of the dependence of logI on pH). Thermodynamic dissociation constants were estimated as an intercept of dependence of pKBH+ on square root of the ionic strength. In order to achieve that, measurements were performed at different ionic strengths: 0.1, 0.25 and 0.5 mol/dm3, adjusted with sodium perchlorate. The obtained thermodynamic pKBH+ values ranged between 2.07 and 2.58. In order to predict proton transfer at a given pH, semiempirical methods AM1 and PM3 were applied. The influence of the substituents present in the p-position of the benzene ring on pKBH+ values of investigated hydrazones was discussed, too. Total energy, binding energy, enthalpy of formation, Gibbs energies of formation, atomic charge and proton affinity values were used to predict protonation site in hydrazone molecule. Furthermore, the stability and the proton affinity of the isomers (E and Z) in which hydrazones exist and their protonated forms were defined.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen. Se siguió el comportamiento espectral de algunas benzoilhidrazonas p-nitro-p sustituidas utilizando ácido perclórico como medio y aplicando espectroscopía UV. La absorción máxima en los espectros se definió en medios ácidos y también se discutieron las transiciones electrónicas (1&lt;pH&lt;7). Se investigó el equilibrio entre la forma neutra y protonada en soluciones de etanol-agua (V / V, 1: 1). Los cambios observados en los espectros UV sugirieron que el proceso de protonación tuvo lugar en un sólo paso. La región de protonación oscila en el intervalo de pH entre 1.4 y 2.9. Utilizando los cambios en el espectro de UV que surgen como resultado de la reacción de protonación, las constantes de disociación estequiométricas fueron determinadas numérica (pKBH+ = n · pH + logI) y gráficamente (intercepción de la dependencia de logI en el pH). Las constantes de disociación termodinámicas fueron estimadas como una intersección en la dependencia de pKBH+ con la raíz cuadrada de la fuerza iónica. Para conseguir lo anterior, se realizaron mediciones a diferentes fuerzas iónicas: 0.1, 0.25 y 0.5 mol / dm3, ajustadas con perclorato de sodio. Los valores termodinámicos de pKBH+ obtenidos oscilaron entre 2.07 y 2.58. Para predecir la transferencia de protones a un pH dado, se utilizaron los métodos semiempíricos AM1 y PM3. También, se discutió la influencia de los sustituyentes presentes en la posición p del anillo de benceno de los valores pKBH+ de las hidrazonas investigadas. Para predecir el sitio de protonación en la molécula de hidrazona, se utilizaron los valores de energía total, energía de unión, entalpía de formación, energía de Gibbs, carga atómica y afinidad protónica. Además, se definió la estabilidad y la afinidad protónica de isómeros (E y Z) en las cuales existen las hidrazonas y sus formas protonadas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[p-nitro-p-substituted benzoylhydrazones]]></kwd>
<kwd lng="en"><![CDATA[dissociation constants]]></kwd>
<kwd lng="en"><![CDATA[protonation]]></kwd>
<kwd lng="en"><![CDATA[UV spectroscopy]]></kwd>
<kwd lng="en"><![CDATA[semiempirical AM1 and PM3 methods]]></kwd>
<kwd lng="es"><![CDATA[Benzoilhidrazonas p-nitro-p sustituidas]]></kwd>
<kwd lng="es"><![CDATA[constantes de disociación]]></kwd>
<kwd lng="es"><![CDATA[protonación]]></kwd>
<kwd lng="es"><![CDATA[espectroscopía UV]]></kwd>
<kwd lng="es"><![CDATA[métodos semi empíricos AM1 y PM3]]></kwd>
</kwd-group>
</article-meta>
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