Encontrados 13 documentos, a visualizar página 1 de 2
A Family of Styrylcoumarins: Synthesis, Spectroscopic, Photophysical and Photoc...
Avó, João; Martins, Sérgio; Parola, António; Lima, João; Ramalho, João; Branco, Paula; Pereira, AntónioA new family of 5-styrylcoumarins exhibit E–Z isomerization around the Cα[DOUBLE BOND]Cβ bond with large extinction coefficients, medium-lived excited states, and moderate fluorescence quantum yields (see picture). The alteration of these photophysical properties is also corroborated by computational studies.
Esculetin-based Organic Chromophores for Dye Sensitized Solar Cells
Martins, Sérgio; Maçaira, João; Andrade, Luísa; Mendes, Adélio; Branco, Paula; Pereira, AntónioThe development of efficient solar energy harvesting systems is one of the greatest scientific challenges today. Recently attention has been driven to alternative solar collecting devices based on an optical absorbing chromophore anchored to the semiconductor surface. Our previous work on coumarins demonstrated that this molecules can be easily tune to incorporate substituents that allow to increase the conjuga...
Synthesis, Absortion and Emission Properties of a New Family of Styryl Coumarin...
Martins, Sérgio; Avó, João; Parola, António; Lima, João; Branco, Paula; Pereira, AntónioSYNTHESIS, ABSORPTION AND EMISSION PROPERTIES OF A NEW FAMILY OF STYRYL COUMARINS. POTENTIAL UTILITY AS MEMORY MEDIA Sérgio Martins,[a] João Avó, [b] A. Jorge Parola, [b] João C. Lima, [b] Paula S. Branco[b] and António Pereira[a] [a] Centro de Química, Departamento de Química, Universidade de Évora, Évora, Portugal, sergiomamartins@gmail.com [b] REQUIMTE, Departamento de Química, Faculdade de Ciências e Te...
Photochromism of 5-styryl coumarins: potential utility as memory media
Martins, Sérgio; Avó, João; Parola, António; Lima, João; Branco, Paula; Ramalho, João; Pereira, AntónioPhotochromism of 5-styryl coumarins: potential utility as memory media Sérgio Martins1, João Avó2, A. Jorge Parola2, João C. Lima2, Paula S. Branco2, João Paulo Ramalho1 and António Pereira1 1Centro de Química, Departamento de Química, Universidade de Évora, Évora, Portugal. 2REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Portugal. Photochromism, the rever...
Técnicas experimentais e numéricas na verificação da integridade de espiras de ...
Branco, Paula Alexandra DiasDissertação apresentada para obtenção do grau de Mestre em Engenharia Mecânica (Área de especialização de Construções Mecânicas), na Faculdade de Engenharia da Universidade do Porto, sob a orientação dos Professores Doutores Mário Augusto Pires Vaz e Francisco José Malheiro Queirós de Melo
Convenient Synthesis of 3-Vinyl and
Gordo, Joana; Avó, João; Parola, Jorge; Lima, João; Pereira, António; Branco, PaulaA variety of 2-hydroxy aldehydes on reaction with 3-butenoic acid afford in a one-pot reaction the corresponding 3-vinylcoumarins. As expected, extension of the delocalized π-electron system accomplished by Heck coupling reactions with aryl halides results in an increased fluorescence of the compounds whose applicability is yet to be established.
Nova Metodologia para a Síntese de 3-Etenil Coumarinas através de Reacções de Heck
Martins, Sérgio; Branco, Paula; Pereira, AntónioNova Metodologia para a Síntese de 3-Etenil Coumarinas através de Reacções de Heck
Gingival margin alterations and the pre-orthodontic treatment amount of keratin...
Closs, Luciane Quadrado; Branco, Paula; Rizzatto, Susana Maria Deon; Raveli, Dirceu Barnabé; Rösing, Cassiano KuchenbeckerO objetivo deste estudo retrospectivo foi associar a quantidade de gengiva ceratinizada existente em adolescentes pré-tratamento ortodôntico e o desenvolvimento de recessões gengivais pós-tratamento ortodôntico. A amostra consistiu de fotografias intra-orais e modelos de estudo de 209 pacientes leucodermas com idades médias de 11,20 ± 1,83 anos nos exames iniciais e 14,7 ± 1,8 anos nos exames finais. Os pacient...
New Methodology for the Synthesis of 3-Substituted Coumarins via Pd-Catalyzed S...
Martins, Sérgio; Branco, Paula; Torre, Maria; Sierra, Miguel; Pereira, AntónioA particularly useful, easy and concise synthesis of diversified 3-aryl coumarin was achieved using Heck coupling reactions between coumarin and aryliodides. The introduction of the aryl moiety occurred regioselective at the 3-position of the heteroaromatic ring.
New Methodology for the Synthesis of 3-Stiryl Coumarins
Branco, Paula; Gordo, Joana; Pereira, AntónioCoumarins, a common motif in a variety of naturally occurring compounds, have attracted intense interest in recent years due to their diverse pharmacological properties, namely as anticoagulant, antimicrobial, antibacterial, anticancer, anti-HIV and antioxidant.1 Moreover, these series of compounds rises to one of the most extensively investigated and commercially significant groups due to their outstanding opt...
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