{"id":24371,"date":"2003-04-07T00:00:00","date_gmt":"2003-04-07T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/sa%c2%adntesis-y-reactividad-de-nuevos-derivados-de-niobioceno\/"},"modified":"2003-04-07T00:00:00","modified_gmt":"2003-04-07T00:00:00","slug":"sa%c2%adntesis-y-reactividad-de-nuevos-derivados-de-niobioceno","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/castilla-la-mancha\/sa%c2%adntesis-y-reactividad-de-nuevos-derivados-de-niobioceno\/","title":{"rendered":"S\u00edntesis y reactividad de nuevos derivados de niobioceno"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Juan  Carlos P\u00e9rez Flores <\/strong><\/h2>\n<p>La obtenci\u00f3n de la estructura cristalina de [nb(h5-c5h4sime3)2h3] (1) permite clasificar este compuesto como un derivado dihidr\u00f3geno elongado, en el cual, en contra de los estudios te\u00f3ricos, se observa como a medida que disminuye la distancia h1..H2 en el ligando dihidr\u00f3geno elongado, disminuye tambi\u00e9n la distancia nb-h.  estas distancias predicen la posibilidad de formaci\u00f3n de un estado hidruro-dihidr\u00f3geno t\u00e9rmicamente accesible, que facilita la salida del ligando dihidr\u00f3geno creando una vacante coordinativa en la esfera de coordinaci\u00f3n del \u00e1tomo de niobio.  las distancias de los ligandos hidruro h1..H2 a todas las temperaturas estudiadas, se mantienen dentro del rango aceptado para que tenga lugar el fen\u00f3meno de intercambio mecanocu\u00e1ntico de esp\u00edn por efecto t\u00fanel. Este hecho permite explicar las caracter\u00edsticas an\u00f3malas observadas en el espectro de 1h-rmn.  se ha obtenido el derivado [nb(h5-c5h4sime3)2(h)(sbph3)](3), cuya protonaci\u00f3n a baja temperatura permite generar el derivado dihidr\u00f3geno [nb(h5-c5h4sime3)2(h2-h2)(sbph3)]cf3c00 (5). Este compuesto se haya implicado en un proceso de intercambio h\/d con el disolvente deuterado que conduce a la formaci\u00f3n de [nb(h5-c5h4sime3)2(h2-hd)(sbph3)]cf3c00 (4). En este caso, el producto de deuteraci\u00f3n parcial se obtiene a -90\u00c2\u00bac e instant\u00e1neamente a la protonaci\u00f3n, lo que constituye un precedente dentro del reducido n\u00famero de casos observados de este tipo.  la evoluci\u00f3n del compuesto (5) a temperatura ambiente permite la formaci\u00f3n del derivado transoide [nb(h5-c5h4sime3)2(h)(sbph3)]cf3c00 (6) como resultado de un proceso de isomerizaci\u00f3n.  la reactividad de (1) y de otros derivados hidruro-niobioceno con ligandos p aceptores coordinados, frente a ligandos derivados de piridinas (piridina, pirimidina, benzotiazolina y oxazolina) y triazinas sustituidas, permite proponer que para estos ligandos, la mayor acidez de los grupos hidroxi- y mercapto- dirige esta react<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>S\u00edntesis y reactividad de nuevos derivados de niobioceno<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 S\u00edntesis y reactividad de nuevos derivados de niobioceno <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Juan  Carlos P\u00e9rez Flores <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Castilla-la mancha<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 04\/07\/2003<\/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>Antonio Otero Montero<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Mar\u00eda no Fajardo gonz\u00e1lez <\/li>\n<li>Rafael G\u00f3mez ram\u00edrez (vocal)<\/li>\n<li>pilar Terreros ceballos (vocal)<\/li>\n<li> Hierro morales isabel del (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Juan Carlos P\u00e9rez Flores La obtenci\u00f3n de la estructura cristalina de [nb(h5-c5h4sime3)2h3] (1) permite clasificar este compuesto [&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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[18451],"tags":[14475,71643,71641,40911,29799,71642],"class_list":["post-24371","post","type-post","status-publish","format-standard","hentry","category-castilla-la-mancha","tag-antonio-otero-montero","tag-hierro-morales-isabel-del","tag-juan-carlos-perez-flores","tag-maria-no-fajardo-gonzalez","tag-pilar-terreros-ceballos","tag-rafael-gomez-ramirez"],"_links":{"self":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/24371","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/comments?post=24371"}],"version-history":[{"count":0,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/24371\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/media?parent=24371"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/categories?post=24371"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/tags?post=24371"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}