Publication: Diseño de materiales moleculares funcionales. Metalomesógenos luminiscentes basados en ligandos piridilpirazol. Nanopartículas de sílice luminiscentes
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2017-11-29
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Universidad Complutense de Madrid
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Abstract
La principal motivación de este proyecto de tesis es dirigida hacia la obtención de materiales moleculares con funcionalidades útiles, tanto para el desarrollo de tecnologías del futuro como para su contribución en aspectos biológicos y, particularmente, clínicos. En este contexto, los metalomesógenos luminiscentes se erigen como interesantes candidatos, ya que la combinación de mesomorfismo y fotoluminiscencia ha resultado de gran utilidad para la construcción de dispositivos electrónicos (OLED’s, LCD’s), agentes de contraste o quimiosensores fluorescentes. Por otro lado, las nanopartículas de sílice luminiscentes, de sobresalientes propiedades fotofísicas y elevada estabilidad han realizado notables aportaciones en el campo de la nanomedicina, entre otros. En base a esas consideraciones, el proyecto de tesis se ha centrado en conseguir dos principales objetivos: A) Síntesis y caracterización de metalomesógenos luminiscentes utilizando como bloques de construcción ligandos de tipo piridilpirazol adecuadamente diseñados; en particular, se persigue controlar las características de las mesofases logradas (naturaleza, estabilidad, temperaturas de transición) así como establecer los requerimientos que conduzcan a la optimización de las propiedades CL (cristal líquido) y luminiscentes de los nuevos derivados. Bajo esta premisa se propuso la preparación de complejos de Ag(I), Pd (II), Zn(II) y Cu(II) con ligandos y estequiometrías favorables para alcanzar especialmente mesofases lamelares. B) Síntesis de nanopartículas de sílice luminiscentes, que ha implicado la obtención de nuevos complejos fluorofóricos del tipo BF2-β-dicetonato alcoxisilano funcionalizados para su utilización posterior como dyes dopantes a una matriz de TEOS (tetraetiloxisilano) en la construcción de nanopartículas fluorescentes. Ambos, desarrollos y resultados se recogen, sistemáticamente, en los siguientes puntos...
The main motivation of this Thesis project is centred on the synthesis of molecular materials with useful functionalities for the development of future technologies, as well as for their contribution to biological and, particularly, clinical aspects. In this context, luminescent metallomesogens stand out as interesting candidates, since the combination of mesomorphism and photoluminescence has been of great usefulness for the construction of electronic devices (OLED's, LCD's), contrast agents or fluorescent chemosensors. On the other hand, luminescent silica nanoparticles, presenting excellent photophysical properties and high stability, have a great influence in the field of nanomedicine, among others. Taking into account these considerations, the project of this thesis is focused on two main goals: A) Synthesis and characterisation of luminescent metallomesogens using specifically designed pyridylpyrazole type ligands as building blocks; in particular the work aims to control the characteristics of the mesophases (nature, stability, transition temperatures) as well as to establish the requirements that lead to the optimisation of the liquid crystal (LC) and luminescent properties of the new derivatives. Under this premise, it was proposed the synthesis of complexes with Ag(I), Pd(II), Zn(II) and Cu(II) centres and favourable ligands and stoichiometries to reach lamellar mesophases. B) Synthesis of luminescent silica nanoparticles, which involved the achievement of new fluorophoric complexes of the type BF2-β-diketonate alkoxysilane functionalised for their subsequent employment as doping dyes of a TEOS (tetraethoxysilane) matrix in order to build fluorescent nanoparticles. The developments of these goals, together with the obtained results are summarised in the following points...
The main motivation of this Thesis project is centred on the synthesis of molecular materials with useful functionalities for the development of future technologies, as well as for their contribution to biological and, particularly, clinical aspects. In this context, luminescent metallomesogens stand out as interesting candidates, since the combination of mesomorphism and photoluminescence has been of great usefulness for the construction of electronic devices (OLED's, LCD's), contrast agents or fluorescent chemosensors. On the other hand, luminescent silica nanoparticles, presenting excellent photophysical properties and high stability, have a great influence in the field of nanomedicine, among others. Taking into account these considerations, the project of this thesis is focused on two main goals: A) Synthesis and characterisation of luminescent metallomesogens using specifically designed pyridylpyrazole type ligands as building blocks; in particular the work aims to control the characteristics of the mesophases (nature, stability, transition temperatures) as well as to establish the requirements that lead to the optimisation of the liquid crystal (LC) and luminescent properties of the new derivatives. Under this premise, it was proposed the synthesis of complexes with Ag(I), Pd(II), Zn(II) and Cu(II) centres and favourable ligands and stoichiometries to reach lamellar mesophases. B) Synthesis of luminescent silica nanoparticles, which involved the achievement of new fluorophoric complexes of the type BF2-β-diketonate alkoxysilane functionalised for their subsequent employment as doping dyes of a TEOS (tetraethoxysilane) matrix in order to build fluorescent nanoparticles. The developments of these goals, together with the obtained results are summarised in the following points...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Químicas, Departamento de Química Inorgánica I, leída el 19-06-2017