Encontrados 21 documentos, a visualizar página 1 de 3
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 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) ...
Synthesis and characterization of the ground and excited states of tripodal-lik...
Pina, João; Melo, J. Sérgio Seixas de; Batista, Rosa M. F.; Costa, Susana P. G.; Raposo, M. Manuela M.Six new thiophene oligomers, here designated as tripodal-like oligothienyl imidazoles, were synthesized and have been investigated in ethanol solution at room and low temperature. The oligomers bear a common core where two or more thiophenes are linked to one or more imidazole unit which further links through its alpha position to a different number of incremental thiophene units. The study involves a comprehen...
The influence of the relative position of the thiophene and pyrrole rings in do...
Pina, João; Melo, J. Sérgio Seixas de; Batista, Rosa M. F.; Costa, Susana P. G.; Raposo, M. Manuela M.A detailed spectroscopic and photophysical study has been carried out on a series of heterocyclic compounds -known to display nonlinear optical properties- consisting on one electron donating thienylpyrrolyl π-conjugated system functionalized with an electron acceptor benzothiazole moiety. The absorption, emission and triplet-triplet absorption together with all relevant quantum yields (fluorescence, intersyste...
Synthesis and evaluation of the optical properties of novel thermally stable ph...
Batista, Rosa M. F.; Costa, Susana P. G.; Belsley, M.; Raposo, M. Manuela M.Six new hyperpolarizable chromophores 3-4 based on functionalized arylthiophene donors and an imidazo-phenanthroline acceptor moiety have been designed and synthesized for the first time in good to excellent yields by condensation of 5,6-phenantroline-dione 2 with formyl-arylthiophene derivatives 1 in the presence of ammonium acetate in glacial acetic acid. The thermal stability, solvatochromic and nonlinear op...
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-...
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...
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