Mostrando ítems 1-10 de 20
Improved polyHEMA-DAQ films for the optical analysis of nitrite
A series of crosslinked poly(2-hydroxyethyl methacrylate) films containing 1,2-diaminoantraquinone (DAQ) have been synthesized and characterized spectroscopically by FT-IR and UV-vis. Their response towards nitrite anion ...
Fluorescence and mass spectrometry studies of the interaction between naproxen and synthetic pseudopeptidic models in organic media
Time-resolved/steady-state fluorescence and mass spectrometry measurements have shown the preferential binding of a non-steroidal anti-inflammatory drug (NSAID) like naproxen 4 to a synthetic pseudopeptidic receptor built ...
Synthesis of new chiral imidazolium salts derived from amino acids: their evaluation in chiral molecular recognition
A family of new imidazolium salts derived from natural amino acids has been synthesized and tested for NMR enantiodiscrimination, as chiral shift reagents, of carboxylic acids. These imidazolium receptors contain different ...
Enantioselective nickel-catalyzed conjugate addition of dialkylzinc to chalcones using chiral α-amino amides
A series of α-amino amides derived from natural amino acids (alanine, valine, phenylalanine, isoleucine, and phenylglycine) have been synthesized and fully characterized. Their Ni(II) complexes prepared from Ni(acac)<sub>2</sub> ...
Time resolved fluorescence of naproxen in organogel medium
The interaction between non-steroidal anti-inflammatory drug naproxen and the self assembled fibrillar network created by a low molecular weight organogelator has been probed by means of time resolved fluorescence spectroscopy.
New polymer-supported photocatalyst with improved compatibility with polar solvents. Synthetic application using solar light as energy source
A new kind of supported photocatalysts derived from low-crosslinked polystrene, containing Rose Bengal and pyridinium groups, is described. Such polymers are capable to catalyze the quantitative synthesis of 5-hydroxy-5H ...
Synthetic application of photoactive porous monolithic polymers
The oxidation of 2-furoic acid to 5-hydroxy-5H-furan-2-one has been accomplished in quantitative yield in chloroform using a novel supported photocatalyst. This material comprises Rose Bengal grafted to the surface of a ...
Pd catalysts immobilized onto gel-supported ionic liquid-like phases (g-SILLPs): A remarkable effect of the nature of the support
New polymeric materials containing functional sites analogous to ionic liquids have been synthesized. Those materials are a supported reservoir for the active Pd species. Their catalytic activity has been evaluated for the ...
Ratiometric fluorescence sensing of phenylalanine derivatives by synthetic macrocyclic receptors
The supramolecular analytical behavior of eight pseudopeptidic fluorescent receptors (1a-c, 2a-c, 3, 4) has been studied. The receptors are either macrocyclic or open chain derivatives based on the naphthalene chromophore. ...
New chiral tetraaza ligands for the efficient enantioselective addition of dialkylzinc to aromatic aldehydes
A series of chiral tetraaza ligands were studied for the enantioselective addition of dialkylzinc to aldehydes. These bis(amino amide) ligands show high enantioselectivity in the addition of organozincs to aromatic aldehydes. ...