Browsing by Author "Sousa, Carla"
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- Novel tetradentate chelators derived from 3-hydroxy-4-pyridinone units: synthesis, characterization and aqueous solution propertiesPublication . Leite, Andreia; Silva, Ana M.G.; Nunes, Ana; Andrade, Mariana; Sousa, Carla; Cunha-Silva, Luís; Gameiro, Paula; de Castro, Baltazar; Rangel, MariaThe synthesis and characterization of three novel tetradentate ligands (T1, T2 and T3) based on 3-hydroxy-4-pyridinone chelating units are described. The three ligands exhibit different flexibility due to the use of two different anchor molecules, piperazine and 1,2-diaminobenzene, and to the diverse length of the 3-hydroxy-4-pyridinone arms. All reactions were performed using both conventional heating and microwave irradiation in order to evaluate the possibility of using greener methods in these synthetic procedures. The results showed that, in all cases, microwave irradiation provides the desired ligands reducing reaction time in ca. 97%. The structure of ligand T3 was resolved by X-ray crystallography, showing significant hydrogen bonding and interesting pep interaction between the benzene and pyridinone rings. The use of potentiometric and spectroscopic methods allowed determination of acidity constants and unequivocal assignment of proton loss for each pKa value. Interaction of the ligands with divalent metal ions was assessed by spectroscopic methods.
- O repositório institucional como ferramenta de gestão do conhecimento: o caso B-Digital da UFPPublication . Sousa, Carla; Quoniam, Luc; Trigo, MiguelEste artigo faz uma abordagem à temática dos repositórios institucionais (RI) como ferramenta de apoio na gestão do conhecimento. Realça o surgimento dos RI como colecções digitais de armazenamento, preservação e divulgação do conhecimento, possibilitando às universidades uma nova estratégia para o aumento da visibilidade e da reforma da comunicação científica. No final é apresentado o RI criado na UFP como ferramenta de apoio na gestão do conhecimento. This article makes an approach to the theme of institutional repositories (IR) as an important tool in knowledge management support. It highlights IR as an emergent reality of digital collections storage and knowledge preservation and dissemination. This all together, allows the universities to a strategic increasing and reforming of scientific communication. At the end it is presented the most recent UFP on knowledge management support – the UFP IR.