Encapsulation of luminescent B(III), Pt(II) complexes and other emitters into functionalized polymeric micro and nanoparticles as potential biomedical imaging tools.

• Autor(a) principal: Duarte, Frederico Gonçalo do Vale
• Data de Publicação: 2020
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10362/112893
• topic: Sensors; Nanoparticles; Self-assembly; Thermochromism; Mechanochromism; Vapochromism; Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química

In this present work, three different classes of fluorescent dyes were characterized, photophysically at the nano scale or at the macro scale, and were further explored to be used as sensors and emissive materials. All nanoscale studies were achieved synthesizing several polymeric micro and nanoparticles doped with two different classes of complexes, boron(III) and platinum(II) and using several polymer matrixes. The first dopant system was based on boron difluoride complexes, varying their alkyl side chain while the chosen polymer matrixes were poly(methyl methacrylate) (PMMA), polyvinylpyrrolidone (PVP) and polystyrene-block-polybutadiene-block-polystyrene (SBS co-polymer). The polymer matrixes, as well as the alkyl side chain, were found to influence the emission and the size of the particles. The particles were considered stable during all thermal stability studies at least during a month, with low variation in the emission intensity, showing promising results as temperature-dependent emission materials. Additionally, a comparison was stablished regarding the macro scale that was reported in a previous work. Co-doped particles were synthesized to develop a system to entrap highly hydrophobic drugs that showed interesting results to be explored in dye&drug-delivery. The second dopant system based on platinum(II) complexes was developed exploring the self-assembly and the aggregation-induced emission enhancement properties of a pyridylpyrazolate Pt(II) metallomesogenic system. The synthesis was achieved by formation of oil-in-water droplets similarly to the previous system. Finally, several coumarin-based pyrazolines compounds were characterized as an attempt to design novel stimuli-responsive chromic materials exhibiting non-reversible thermo-, mechano-, solvato- and vapochromic behaviors due to the presence of intermolecular ··· interactions.