Encontrados 18 documentos, a visualizar página 1 de 2
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...
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) ...
Exploring the emissive properties of new azacrown compounds bearing aryl, furyl...
Oliveira, Elisabete; Baptista, Rosa M. F.; Costa, Susana P. G.; Raposo, M. Manuela M.; Lodeiro, CarlosThree new compounds bearing furyl, aryl or thienyl moieties linked to an imidazo-crown ether system (1, 2 and 3) were synthesized and fully characterized by elemental analysis, infrared, absorption and emission spectroscopy, X-ray crystal diffraction, and MALDI-TOF-MS spectrometry. The interaction towards metal ions (Ca2+, Cu2+, Ni2+ and Hg2+) and F- has been explored in solution by absorption and fluorescence ...
Synthesis and evaluation of new thienyl and bithienyl-bis-indolylmethanes as co...
Batista, Rosa M. F.; Oliveira, M. Elisabete; Nuñez, Cristina; Costa, Susana P. G.; Lodeiro, Carlos; Raposo, M. Manuela M.The synthesis and full characterization of new bis-indolylmethanes containing thienyl and bithienyl moieties are reported. The sensor ability of the compounds in the presence of halide ions (F-, Cl-, Br- and I-), NO3-, ClO4-, SO42-, CN- and OH- ions was investigated in acetonitrile. The experimental results indicate that they could act as selective chromogenic-sensing molecules for the most basic anions F-, CN-...
Synthesis, characterization and spectroscopic studies of two new schiff-base bi...
Pedras, Bruno; Fernandes, Luz; Oliveira, Elisabete; Rodríguez, Laura; Raposo, M. Manuela M.; Capelo, José Luis; Lodeiro, CarlosNickel(II); Palladium(II); Mercury(II); Sodium(I); ; Crown ether, Schiff base, Luminescence ; Two new ligands provided with a 15-crown-5 as receptor unit and bithiophen unit as emissive probe have been synthesized and characterized in order to evaluate the coordination capabilities and their sensor effect. Ligand L1 presents an aromatic crown ether moiety directed linked to the imine-2,2´-bithiophene π–conjuga...
New oligothienyl-imidazo-phenanthroline chromophores for NLO applications
Batista, Rosa M. F.; Costa, Susana P. G.; Lodeiro, Carlos; Belsley, M.; Gomes, E. Matos; Raposo, M. Manuela M.A new series of oligothienyl-imidazo-phenanthrolines 3 were synthesised in good to excellent yields by condensation of 5,6-phenantroline-dione 2 with formyl-thiophene derivatives 1 in the presence of ammonium acetate in glacial acetic acid. Furthermore, their solvatochromism and molecular optical nonlinearities were determined and comparatively studied. The experimental results indicate that phenanthrolines 3, ...
Synthesis and characterization of novel (oligo)thienyl-imidazo-phenanthrolines ...
Batista, Rosa M. F.; Costa, Susana P. G.; Belsley, M.; Lodeiro, Carlos; Raposo, M. Manuela M.A series of new heterocyclic chromophores 3-6 were synthesised in moderate to excellent yields by condensation of 5,6-phenantroline-dione with formyl-thiophene derivatives 1-2 in the presence of ammonium acetate in glacial acetic acid. These chromophores possess a (oligo)thienyl- π-conjugated system attached to an imidazophenanthroline moiety. These derivatives were evaluated conc...
Heteroaromatic alanine derivatives bearing (oligo)thiophene units : synthesis a...
Costa, Susana P. G.; Oliveira, M. Elisabete; Lodeiro, Carlos; Raposo, M. Manuela M.A series of new benzoxazolylalanine derivatives bearing (oligo)thiophene units at the side chain were synthesized in good yields. The photophysical characterization of these amino acids was performed by UV-vis absorption and fluorescence emission studies and revealed that some of the compounds display high fluorescent quantum yields, making them good candidates for application as fluorescent probes.
Synthesis and evaluation of bipendant-armed (oligo)thiophene crown ether deriva...
Batista, Rosa M. F.; Oliveira, M. Elisabete; Costa, Susana P. G.; Lodeiro, Carlos; Raposo, M. Manuela M.Three new (oligo)thiophene bipendant-armed ligands 2a-c, derived from 2-(aminomethyl)-15-crown-5, have been synthesized and characterized. Compounds 2a-c were prepared by reductive amination of the corresponding macrocycle with formyl thiophene derivatives 1a-c in the presence of NaBH(OAc)3 in fair to good yields. The photophysical properties of ligands 2a-c were studied and they were also evaluated as chemosen...
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