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Synthesis, characterization, photophysical studies and interaction with DNA of ...
Pedras, Bruno; Batista, Rosa M. F.; Tormo, Laura; Costa, Susana P. G.; Raposo, M. Manuela M.; Orellana, Guillermo; Capelo, José Luis; Lodeiro, CarlosA new family of Ru(II) polypyridyl complexes (C1 to C6) containing furyl- or thienyl-imidazo-phenanthroline ligands (4-6) were synthesized using microwave irradiation and characterized by elemental analysis, 1H-NMR, UV-vis absorption and fluorescence spectroscopy, FAB, EI-MS and MALDI-TOF-MS spectrometry. On the other hand, the novel furyl- or thienyl-imidazo-phenanthroline derivatives (5-6) were synthesized th...
Synthesis and evaluation of thermal, electrochemical and nonlinear optical prop...
Fonseca, A. Maurício C.; Castro, M. Cidália R.; Belsley, M.; Raposo, M. Manuela M.Materials exhibiting large optical nonlinearities continue to be the subject of intense studies because of their potential applications in modern communication technologies involving optical data processing, transmission, or storage, where they are gradually replacing classical electronic devices.[1] Earlier we reported on the synthesis and evaluation of thermal, redox and NLO properties of donor-acceptor subst...
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 ...
Push-pull bithiophene azo-chromophores bearing thiazole and benzothiazole accep...
Raposo, M. Manuela M.; Castro, M. Cidália R.; Belsley, M.; Fonseca, A. Maurício C.Three series of bithiophene azo dyes functionalized with thiazol-2-yl or benzothiazol-2-yl-diazene acceptor moieties were synthesized through azo coupling reaction using 2,2´-bithiophene, 5-alkoxy-2,2´-bithiophenes, 5-N,N-dialkylamino-2,2´-bithiophenes and thiazolyl and benzothiazolyl diazonium salts as coupling components. The 5-alkoxy-2,2´-bithiophene precursors yielded the 5-thiazolylazo-5´-alkoxy-2,2´-bithi...
Design, synthesis and characterization of the electrochemical, nonlinear optica...
Raposo, M. Manuela M.; Castro, M. Cidália R.; Fonseca, A. Maurício C.; Schellenberg, Peter; 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...
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...
Synthesis and characterization of novel push-pull thiophene and thienylpyrrole ...
Batista, Rosa M. F.; 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 ...
Imidazo-benzo-15-crown-5 ether bearing arylthienyl and bithienyl moieties as no...
Batista, Rosa M. F.; Oliveira, Elisabete; Costa, Susana P. G.; Lodeiro, Carlos; Raposo, M. Manuela M.Novel fluorescent ionophores bearing imidazo-arylthienyl or imidazo-bithienyl pi-conjugated bridges functionalized with one or two fused benzo-15-crown-5 ethers as receptor units are reported. The sensing ability of the compounds in the presence of metallic cations (Li+, Na+, K+, Ca2+, Zn2+, Cu2+, Ni2+, Pd2+ and Hg2+) and fluoride ion was studied in MeCN/DMSO solutions by absorption and emission spectroscopy. T...
(Oligo)thienyl-imidazo-benzocrown ether derivatives : synthesis, photophysical ...
Batista, Rosa M. F.; Oliveira, Elisabete; Costa, Susana P. G.; Lodeiro, Carlos; Raposo, M. Manuela M.; Ferreira, R. Cristina M.A series of novel (oligo)thienyl-imidazobenzocrown ethers were synthesised through a simple method and evaluated as fluorimetric chemosensors for transition metal cations. Interaction with Ni2+, Pd2+, and Hg2+ in ACN/DMSO solution (99:1) was studied by absorption and emission spectroscopy. Chemoselectivity studies in the presence of Na+ were also carried out and a fluorescence enhancement upon chelation (CHEF) ...
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