A5020219976- Molecular Sensors and Ion Detection
- Luminescence and Fluorescent Materials
- Nonlinear Optical Materials Research
- Porphyrin and Phthalocyanine Chemistry
- Analytical Chemistry and Sensors
- Photochemistry and Electron Transfer Studies
- Photochromic and Fluorescence Chemistry
- Nonlinear Optical Materials Studies
- Inorganic and Organometallic Chemistry
- Synthesis and biological activity
- Multicomponent Synthesis of Heterocycles
- Organic Light-Emitting Diodes Research
- Chemical synthesis and pharmacological studies
- Conducting polymers and applications
- Synthesis and Characterization of Heterocyclic Compounds
- Supramolecular Chemistry and Complexes
- Advanced Chemical Sensor Technologies
- Magnetism in coordination complexes
- Water Quality Monitoring and Analysis
- Synthesis of Indole Derivatives
- Multiferroics and related materials
- Bioactive Compounds and Antitumor Agents
- Oxidative Organic Chemistry Reactions
- Advanced Sensor and Energy Harvesting Materials
- Environmental Sustainability and Education
University of Minho
2012-2025
Emerald Group Publishing (United Kingdom)
2022
Universidade Estadual de Campinas (UNICAMP)
2022
Universidade do Sul de Santa Catarina
2015
University of Coimbra
2007-2014
Universidade Nova de Lisboa
2007
Rede de Química e Tecnologia
2007
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.
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...
This work explores the self-assembly and optical properties of a novel chiral, aromatic-rich Boc-Phe-Phe dipeptide derivative functionalized with benzothiazole bicyclic ring, which forms supramolecular structures. Leveraging well-known self-assembling capabilities diphenylalanine dipeptides, this modified introduces heterocyclic unit that significantly enhances fluorescence resulting nanostructures. The derivative’s rich aromatic character drives formation structures through...
In recent decades, substantial progress has been made in embedding molecules, nanocrystals, and nanograins into nanofibers, resulting a new class of hybrid functional materials with exceptional physical properties. Among these materials, nanofibers exhibiting ferroelectric, piezoelectric, pyroelectric, multiferroic, nonlinear optical characteristics, have attracted considerable attention undergone improvements. This review critically examines developments, focusing on strategies for...
This work explores the self-assembly and optical properties of a novel chiral, aromatic-rich Boc-Phe-Phe dipeptide derivative functionalized with benzothiazole bicyclic ring that forms supramolecular structures. Leveraging well-known self-assembling capabilities diphenylalanine dipeptides, this modified introduces heterocyclic unit significantly enhances fluorescence resulting nanostructures. The derivative's rich aromatic character drives formation structures through self-organization...
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....
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...
Novel imidazo-anthraquinones functionalised with indole and carbazole have been synthesised characterised their evaluation as colorimetric chemosensors was carried out in acetonitrile well acetonitrile/H2O (97:3) the presence of several anions such F− , Cl− Br− I− CN− AcO− BzO− . In addition, behaviour H+ OH− also studied. Upon addition to solutions compounds 1–3, a marked colour change from yellow orange observed fluorescence emission 1 2 switched 'on'. The recognition organic aqueous...
A detailed spectroscopic and photophysical study has been carried out on a series of heterocyclic compounds—known to display nonlinear optical properties—consisting electron donating thienylpyrrolyl π-conjugated system functionalized with an acceptor benzothiazole moiety. The absorption, emission triplet–triplet absorption together all relevant quantum yields (fluorescence, intersystem crossing internal conversion), excited state lifetimes the overall set deactivation rate constants (kF, kIC...
A comprehensive study has been made in solution at room temperature (293 K), low (77 and thin films (Zeonex matrixes) of the spectral photophysical properties six arylthienyl- bithienyl-benzothiazole derivatives functionalized with different donor groups. Similar experiments have carried out two related precursors (containing arylthienyl aryl-bithienyl conjugated systems), results are compared. Singlet−singlet triplet−triplet absorption spectra, emission spectra together lifetimes quantum...
Abstract The synthesis and full characterization of new bis‐indolylmethanes containing thienyl bithienyl moieties are reported. sensor ability the compounds in presence halide ions (F − , Cl Br I ), NO ClO SO CN OH was investigated acetonitrile. experimental results indicate that they could act as selective chromogenic‐sensing molecules for most basic anions F a well‐defined color change from yellow to pink observed. interaction constants between 1 2 were calculated increased order > ....