Project/scholarship details
- Project/scholarship ID
105597
- Reference
PTDC/CTM/105597/2008
- FundRef URI
- Funder
FCT - Fundação para a Ciência e a Tecnologia, I.P.
- Funder's country
Portugal
- Funding program
5876-PPCDTI
- Funding amount
165,000.00 €
- Start date
2010-04-01
- End date
2014-03-31
Documents
Highly efficient and thermally stable NLO organic materials based on pyrrole an...
Castro, M. Cidália R.; Fonseca, A. Maurício C.; Belsley, M.; Raposo, M. Manuela M.A series of novel donor-acceptor chromophores designed to have good second order nonlinear optical responses has been synthesized and characterized. This series of compounds was designed to explore the consequence of using different electron accepting moieties which were linked through an arylthiophene bridge to a pyrrole heterocycle that plays the role of an auxiliary donor group. These new push-pull chromopho...
Synthesis and evaluation of NLO properties of π-conjugated donor‐acceptor syste...
Castro, M. Cidália R.; Fonseca, A. Maurício C.; Belsley, M.; Raposo, M. Manuela M.Two series of novel push-pull heterocyclic azo dyes have been synthesized and characterized. The two series of compounds were based on different combinations of π-conjugated bridges (bithiophene and thienylpyrrole) which also act simultaneously as donor groups, together with diazo(benzo)thiazolyl as acceptor moieties. Their thermal stability and electrochemical behavior were characterized, while hyper-Rayleigh ...
Synthesis and characterization of novel push-pull thiophene and thienylpyrrole ...
Batista, Rosa Maria Ferreira; Costa, Susana P. G.; Belsley, M.; Raposo, M. Manuela M.The synthesis and characterization of new chromophores with second-order nonlinearities containing thienylpyrrole 1a, 2a-b, bithiophene 3 and arylthiophene 4 as π-conjugated bridges and indanonedicyanovinyl acceptor group are reported. The effect of placing the acceptor group at thiophene or pyrrole rings on the optoelectronic properties was also evaluated for thienylpyrrole derivatives 1a and 2a-b. The linear ...
Synthesis and characterization of novel diazenes bearing pyrrole, thiophene and...
Raposo, M. Manuela M.; Fonseca, A. Maurício C.; Castro, M. Cidália R.; Belsley, M.; Cardoso, M. Fátima S.; Carvalho, Luís M.; Coelho, Paulo J.Two series of novel thermally stable second-order nonlinear optical (NLO) and photochromic chromophores have been designed and synthesized. The two series of compounds were based on different combinations of donor groups (pyrrole or thienylpyrrole) which act simultaneously as Π-conjugated bridges, together with diazoaryl or diazothiazolyl as acceptor moieties. Their photochromic and electrochemical behavior wer...
Design, synthesis and characterization of the electrochemical, nonlinear optica...
Raposo, M. Manuela M.; Castro, M. Cidália R.; Fonseca, A. Maurício C.; Schellenberg, Peter Michael; Belsley, M.Two series of related donor-acceptor conjugated heterocyclic azo dyes based on the thienylpyrrole system, functionalized with benzothiazol-2-yl (5-6) or benzothiazol-6-yl acceptor groups (7) through an N=N bridge, have been synthesized by azo coupling using 1-alkyl(aryl)thienylpyrroles (1) and benzothiazolyl diazonium salts (2-4) as coupling components. Their optical (linear and first hyperpolarizability), elec...
Ferroelectric characterization of aligned barium titanate nanofibres
Sá, Pedro; Barbosa, José Gusman; Bdikin, Igor; Almeida, B. G.; Rolo, Anabela G.; Gomes, E. Matos; Belsley, M.; Kholkin, Andrei L.; Isakov, DmitryWe report the synthesis, structural and ferroelectric characterization of continuous well-aligned nanofibres of barium titanate produced by the electrospinning technique. The fibres with average diameter of 150-400 nm consist of connected nanoparticles of BaTiO3 stacked together to form the shape of a long filament. The tetragonal phase in the obtained nanofibres was revealed by the x-ray diffraction and Raman ...
2,4,5-Tri(hetero)arylimidazoles: design, synthesis and characterization as nove...
Raposo, M. Manuela M.2,4,5-Tri(hetero)aryl-imidazoles are a versatile class of compounds with a wide range of applications in diverse areas such as medicinal or materials chemistry due to their biological activity, as well their optoelectronic properties. Our earlier studies showed that the optical and thermal properties of these derivatives could be tuned by substitution of aryl groups at positions 2, 4 and 5 by 5-membered heteroc...
Intense optical second harmonic generation from centrosymmetric nanocrystalline...
Isakov, Dmitry; Belsley, M.; Gomes, E. Matos; Goncalves, Hugo; Schellenberg, Peter; Almeida, B. G.We demonstrate an approach that uses normally centrosymmetric, but highly polarizable organic molecules of para-nitroaniline (p-NA) as very efficient second harmonic generator (SHG) for near infra-red light. The approach is based on an effective manipulation of the nanocrystalline size and their assembly into a highly orientated mesocrystalline structures. The resulting mesocrystalline form of p-NA consists of ...
Phenanthroimidazole derivatives as fluorimetric chemosensors in aqueous medium
Ferreira, R. Cristina M.; Costa, Susana P. G.; Raposo, M. Manuela M.In recent years the research of sensors with good sensitivity and good selectivity in aqueous medium has been of great interest. Chemosensors soluble in aqueous media are very interesting, because of the importance in revealing a number of biological processes, disease states and environmental pollutions. 2,4,5-Triaryl-imidazoles are versatile compounds with application in medicine, due to their biological acti...
Synthesis, characterization and evaluation of fluorimetric chemosensors for ion...
Ferreira, R. C. M.; Costa, Susana P. G.; Raposo, M. Manuela M.The new 2,4,5-tri-substituted imidazole derivatives 2 and 3 were obtained in good yields through a Radziszewski reaction followed by alkylation. The new derivatives were characterized by the usual spectroscopic techniques and a detailed photophysical study was undertaken. The evaluation of the compounds as fluorimetric chemosensors was carried out by performing spectrofluorimetric titrations in acetonitrile in ...
Report
Embed
<script type="text/javascript">
<!--
document.write('<div id="rcaap-widget"></div>');
document.write('<script type="text/javascript" src="https://www.rcaap.pt/snippet?resource=documents&project=FCT%2F5876-PPCDTI%2F105597&fields=id,titles,creators,issueDate,link,descriptions"></script>');
-->
</script>