A5011594915- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Molecular Sensors and Ion Detection
- Supramolecular Chemistry and Complexes
- Luminescence and Fluorescent Materials
- Crystallography and molecular interactions
- Mass Spectrometry Techniques and Applications
- Lanthanide and Transition Metal Complexes
- Structural and Chemical Analysis of Organic and Inorganic Compounds
- Fullerene Chemistry and Applications
- Crystal structures of chemical compounds
- Analytical Chemistry and Sensors
- Microwave-Assisted Synthesis and Applications
- Chemical Synthesis and Analysis
- Organic Light-Emitting Diodes Research
Institute for Biotechnology and Bioengineering
2018-2024
University of Lisbon
2017-2024
Metropolitan University of Educational Sciences
2020
Rede de Química e Tecnologia
2017
Instituto Politécnico de Lisboa
2017
Fluorescent receptors (4a–4c) based on (thio)ureido-functionalized hexahomotrioxacalix[3]arenes were synthesised and obtained in the partial cone conformation solution. Naphthyl or pyrenyl fluorogenic units introduced at lower rim of calixarene skeleton via a butyl spacer. The binding biologically environmentally relevant anions was studied with NMR, UV–vis absorption, fluorescence titrations. Fluorescence receptor 4c displays both monomer excimer fluorescence. thermodynamics complexation...
Tetraureido‐dihomooxacalix[4]arenes ( tert ‐butyl 4a and phenyl 4b ) were synthesised obtained in a partial cone conformation solution the solid state, as confirmed by NMR X‐ray diffraction studies. Their complexation ability towards halides, pseudo‐halides oxoanions was assessed 1 H UV/Vis titrations. Structural energetic insights of phenylurea complexes also using molecular dynamics (MD) simulations. The binding data showed that association constants are strongly dependent on nature...
The intrinsic electronic absorption and fluorescence properties of several dihomooxacalix[4]arenes are studied.
Fluorescent dihomooxacalix[4]arene-based receptors 5a–5c, bearing two naphthyl(thio)ureido groups at the lower rim via a butyl spacer, were synthesised and obtained in cone conformation solution. The X-ray crystal structures of 1,3- (5a) 3,4-dinaphthylurea (5b) derivatives are reported. Their binding properties towards several anions different geometries assessed by 1H-NMR, UV-Vis absorption fluorescence titrations. Structural energetic insights naphthylurea 5a 5b complexes also using...
Two bidentate dihomooxacalix[4]arene receptors bearing phenylurea moieties substituted with electron-withdrawing groups at the lower rim via a butyl spacer (CF3-Phurea 5b and NO2 Phurea 5c) were obtained in cone conformation solution, as shown by NMR. The X-ray crystal structure of is reported. binding affinity these towards several relevant anions was investigated 1H NMR, UV-Vis absorption different solvents, fluorescence titrations. Compounds 5c also tested ditopic for organic ion pairs,...
The binding behaviour of two ureido-hexahomotrioxacalix[3]arene derivatives bearing naphthyl (1) and pyrenyl (2) fluorogenic units at the lower rim towards selected nitroaromatic compounds (NACs) was evaluated. Their affinity, or lack it, determined by UV-Vis absorption, fluorescence NMR spectroscopy. Different computational methods were also used to further investigate any possible complexation between calixarenes NACs. All results show no significant interaction 1 2 NACs in either...
Thermally activated delayed fluorescence (TADF) of 12C70 and 13C70 was observed up to 140 °C in a p-tert-butyldihomooxacalix[4]arene solid matrix, temperature range significantly higher than that previous TADF quantitative studies. An effective singlet-triplet energy gap 29 kJ/mol triplet formation quantum yields 0.97 0.99 were measured for 13C70, respectively. The photophysical properties the two fullerenes this new matrix are comparable those obtained polystyrene at lower range....
Direct O-alkylation of p-tert-butyldihomooxacalix[4]arene (1) with N-(bromopropyl)- or N-(bromoethyl)phthalimides and K2CO3 in acetonitrile was conducted under conventional heating (reflux) using microwave irradiation ball milling methodologies. The reactions afforded mono- mainly distal di-substituted derivatives the cone conformation, a total eight compounds. They were isolated by column chromatography, their conformations substitution patterns established NMR spectroscopy (1H, 13C, COSY...