A5034227250- Molecular Sensors and Ion Detection
- Luminescence and Fluorescent Materials
- Photochromic and Fluorescence Chemistry
- Nonlinear Optical Materials Research
- Porphyrin and Phthalocyanine Chemistry
- Analytical Chemistry and Sensors
- Nonlinear Optical Materials Studies
- Photochemistry and Electron Transfer Studies
- Synthesis and biological activity
- Conducting polymers and applications
- Organic Chemistry Cycloaddition Reactions
- Multicomponent Synthesis of Heterocycles
- Synthesis and Characterization of Heterocyclic Compounds
- Inorganic and Organometallic Chemistry
- Synthesis and Biological Evaluation
- Organic Electronics and Photovoltaics
- Synthesis of Organic Compounds
- Advanced Chemical Sensor Technologies
- Chemical Synthesis and Analysis
- Advanced biosensing and bioanalysis techniques
- Bioactive Compounds and Antitumor Agents
- Synthesis and Characterization of Pyrroles
- Synthesis of heterocyclic compounds
- TiO2 Photocatalysis and Solar Cells
- Synthesis of Indole Derivatives
University of Minho
2016-2025
Clinical Academic Center of Braga
2017-2021
Universidade Nova de Lisboa
2007-2019
University of Aveiro
2013-2018
Rede de Química e Tecnologia
2006-2015
University of Coimbra
2007-2014
Institute for Biotechnology and Bioengineering
2007
Universidad de Málaga
2006
Merseburg University of Applied Sciences
2006
University of Wales
1998
Novel colorimetric receptors for fluoride ion sensing containing anthraquinone as a chromogenic signaling unit and imidazo-2,2'-bithiophene binding sites are reported. Well-defined color change was observed upon addition of ions to acetonitrile solutions 2. Compounds 2a−c, deprotonated after addition, were studied metal chemosensors in the presence Zn(II), Hg(II), Cu(II) solutions, especially compound 2a which displayed marked from pink yellow-gold colors complexation.
New dicyanovinyl-substituted 1-(alkyl)aryl-2-(2'-thienyl)pyrroles 2 were synthesized and characterized. The solvatochromic behavior of the compounds was investigated. All derivatives showed reversible oxidation reduction on CV time scale. hyperpolarizabilities (β) measured using hyper-Rayleigh scattering. results are among highest β values reported for donor−acceptor-substituted thienylpyrroles.
A family of heterocyclic thiosemicarbazone dyes (1−9) linked to different furan, thiazole, (bi)thiophene, and arylthiophene π-conjugated bridges were synthesized in good yields, their response toward anions was studied. Acetonitrile solutions 1−9 show bands the 326−407 region that are modulated by electron-donor or -acceptor strength systems appended phenylthiosemicarbazone moiety. Anions shape such as fluoride, chloride, bromide, iodide, dihydrogen phosphate, hydrogen sulfate, nitrate,...
The use of benzothiazole as an electron-withdrawing group allows obtaining the fastest thermal isomerisation kinetics reported heretofore for neutral azo dyes (70 μs at 298 K). These green light activatable molecules are valuable candidates molecular photoswitches since they tolerate thousands working cycles with no sign fatigue.
Four imidazoanthraquinone derivatives (2a-d) were synthesized and characterized their coordination behavior against selected anions cations tested. Acetonitrile solutions of probes showed charge-transfer absorptions in the 407-465 nm range. The four emitted 533-571 interval. recognition ability 2a-d was evaluated presence F(-), Cl(-), Br(-), I(-), OCN(-), BzO(-), ClO4(-), AcO(-), HSO4(-), H2PO4(-), CN(-). Only H2PO4(-) induced a new red-shifted absorption band that attributed to...
Fluorescent labelling is a versatile tool to visualize biomolecules containing primary amines in their cellular environment, allowing the study of function or interactions. Here, three organic fluorophores that can irreversibly bind amine group on target biomolecule are reported. They consist push–pull heterocyclic dyes based bithiophene and incorporating terminal N -hydroxysuccinimidyl ester as reactive for groups from (poly)amines, peptides proteins. Their potential chemosensors amines,...
A series of push−pull chromophores built around thiophene-based π-conjugating spacers and bearing various types amino donors cyanovinyl acceptors have been analyzed by means UV−vis−NIR, IR, Raman spectroscopic measurements in the solid state as well solution. The intramolecular charge transfer (ICT) these π-conjugated systems has also tested analyzing ability solute molecules to undergo shifts their fluorescence emission maxima with increasing solvent polarity. These oligomers display an...
Abstract A series of nonlinear optical chromophores 6 containing a substituted benzothiazole ring have been synthesized and characterized. 1,3‐Benzothiazoles were prepared by treating various formyl derivatives thienyl compounds with ortho ‐aminobenzenethiol in fair to excellent yields. These turn Suzuki coupling between aryl precursors. The electronic interactions donor acceptor end groups the conjugated 1,3‐benzothiazoles are revealed intense markedly solvatochromic CT transitions....
We have synthesized several new push-pull oligothiophenes based on the boron dipyrromethene (BODIPY) moiety as electron acceptor and more well-known substituted with N,N-dialkylamino functions to enhance their electron-donor ability. A complete characterization of electronic properties has been carried out; it consists photophysical, electrochemical, vibrational properties. The compounds studied after chemical treatment acids oxidation. In this regard, they can be termed NIR dyes amphoteric...
A family of heterocyclic thiosemicarbazone dyes (3a-f and 4) containing furyl groups was synthesized in good yields, characterized their response acetonitrile the presence selected anions studied. Acetonitrile solutions 3a-f 4 showed absorption bands 335-396 nm range which are modulated by electron donor or acceptor strength systems appended to moiety. Fluoride, chloride, bromide, iodide, dihydrogen phosphate, hydrogen sulphate, nitrate, acetate cyanide were used recognition studies. From...
The synthesis and comprehensive characterization of the excited states four novel triphenylamine-benzimidazole derivatives has been undertaken in solution (ethanol methylcyclohexane) at room temperature. This includes determination absorption, fluorescence, triplet-triplet absorption spectra, together with quantum yields internal conversion, intersystem crossing, singlet oxygen. From overall data radiative radiationless rate constants could be obtained, it is shown that compounds are highly...
Seven new bioinspired chemosensors (2–4 and 7–10) based on fluorescent peptides were synthesized characterized by elemental analysis, 1H 13C NMR, melting point, matrix-assisted laser desorption–ionization time-of-flight mass spectrometry (MALDI-TOF-MS), IR UV–vis absorption emission spectroscopy. The interaction with transition- post-transition-metal ions (Cu2+, Ni2+, Ag+, Zn2+, Cd2+, Hg2+, Pb2+, Fe3+) has been explored fluorescence spectroscopy MALDI-TOF-MS. reported peptide systems,...
Benzothiazole-pyrrole-based azo dyes greatly enhance their thermal isomerisation rate by up to 160 times when they are under the influence of nematic mean field yielding LC-based photochromic oscillators with highest oscillation frequencies reported so far (2.6 kHz at 298 K).