{"id":16376,"date":"2002-12-04T00:00:00","date_gmt":"2002-12-04T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/caracterizacion-electroqua%c2%admica-y-espectroscopia-de-compuestos-s-triazinicos-precursores-de-herbicidas-de-la-famila-de-la-atrazina\/"},"modified":"2002-12-04T00:00:00","modified_gmt":"2002-12-04T00:00:00","slug":"caracterizacion-electroqua%c2%admica-y-espectroscopia-de-compuestos-s-triazinicos-precursores-de-herbicidas-de-la-famila-de-la-atrazina","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/caracterizacion-electroqua%c2%admica-y-espectroscopia-de-compuestos-s-triazinicos-precursores-de-herbicidas-de-la-famila-de-la-atrazina\/","title":{"rendered":"Caracterizaci\u00f3n electroqu\u00edmica y espectroscopia de compuestos s-triazinicos: precursores de herbicidas de la famila de la atrazina"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Rafael P\u00e9rez Morales <\/strong><\/h2>\n<p>Se estudian precursores qu\u00edmicos de herbicidas s-triaz\u00ednicos en medios agua-etoh(10%): 2,4-diamino-s-triazina (dst), 2-cl-4,6-diamino-s-triazina (cdt) y 2-cl-4,6-dimetoxi-s-triazina (cmt) con objeto de determinar el comportamiento fisicoqu\u00edmico en relaci\u00f3n con sus mecanismos electroqu\u00edmicos de reducci\u00f3n, empleando la polarograf\u00eda, la voltametr\u00eda c\u00edclica y la espectrofotometr\u00eda uv-visible. La escasez de bibliograf\u00eda y las controversias entre los resultados aportados por los distintos autores, justifican el inter\u00e9s y la oportunidad del tema planteado.  los espectros de absorci\u00f3n uv-visible var\u00edan con la acidez del medio, lo que indica la existencia de reacciones \u00e1cido-base. En medios \u00e1cidos, se observan pka debidos a la protonaci\u00f3n del n3 (dst) o n5 (cdt y cmt) del anillo triaz\u00ednico y, en medios b\u00e1sicos, pkb por disociaci\u00f3n de los grupos amino (dst y cdt): pka=3,5 y pkb=9,3 (dst): pka=1,2 y pkb=11,5; pk=1,9 (cmt).  los registros y resultados en polarograf\u00eda (dc y dp) y voltametr\u00eda c\u00edclica, en funci\u00f3n de las diversas variables experimentales, junto a los an\u00e1lisis logar\u00edtmicos, las representaciones de tafel y el n\u00c2\u00ba de electrones participantes en la reacci\u00f3n general (dst:2; cdt:4; cmt:3 a ph&lt;3), nos conducen a procesos globales de reducci\u00f3n irreversibles y regidos por difusi\u00f3n cuando il es constante con el ph (existiendo una cierta adsorci\u00f3n del reactivo), donde se reduce el anillo directamente (dst) o tras la eliminaci\u00f3n del \u00e1tomo del cl de la mol\u00e9cular (cdt y cmt).  en consecuencia, se proponen los siguientes mecanismos de reducci\u00f3n:  dst  a,- en medios \u00e1cidos, tiene lugar un proceso bielectr\u00f3nico (pico 1) de primer orden tipo ec.  b,- en medios neutros-b\u00e1sicos, hay un segundo proceso bielectr\u00f3nico (pico 2) de primer orden, tipo ece.  cdt  a,- en  medios \u00e1cidos, se observa un prepico (pico 1) que corresponde a una preonda de adsorci\u00f3n del reactivo sobre el electrodo.  b,- a ph&lt;pka, t<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Caracterizaci\u00f3n electroqu\u00edmica y espectroscopia de compuestos s-triazinicos: precursores de herbicidas de la famila de la atrazina<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Caracterizaci\u00f3n electroqu\u00edmica y espectroscopia de compuestos s-triazinicos: precursores de herbicidas de la famila de la atrazina <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Rafael P\u00e9rez Morales <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 C\u00f3rdoba<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 12\/04\/2002<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Jos\u00e9 Miguel Rodriguez Mellado<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: manuel Blazquez ruiz <\/li>\n<li>Juan  Manuel Fern\u00e1ndez romero (vocal)<\/li>\n<li> Dominguez p\u00e9rez Manuel Mar\u00eda (vocal)<\/li>\n<li>mercedes Ru\u00edz montoya (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Rafael P\u00e9rez Morales Se estudian precursores qu\u00edmicos de herbicidas s-triaz\u00ednicos en medios agua-etoh(10%): 2,4-diamino-s-triazina (dst), 2-cl-4,6-diamino-s-triazina (cdt) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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