A5067811306- Photochromic and Fluorescence Chemistry
- Synthesis of Indole Derivatives
- Synthesis of Organic Compounds
- Porphyrin and Phthalocyanine Chemistry
- Polydiacetylene-based materials and applications
- Photoreceptor and optogenetics research
- Synthetic Organic Chemistry Methods
- Asymmetric Synthesis and Catalysis
- Photopolymerization techniques and applications
- Radical Photochemical Reactions
- Oxidative Organic Chemistry Reactions
- Multicomponent Synthesis of Heterocycles
- Photochemistry and Electron Transfer Studies
- Dyeing and Modifying Textile Fibers
- Synthesis and Reactions of Organic Compounds
- Axial and Atropisomeric Chirality Synthesis
- Olfactory and Sensory Function Studies
- Organic Chemistry Synthesis Methods
- Synthesis and Biological Evaluation
- Organic Chemistry Cycloaddition Reactions
- Organoboron and organosilicon chemistry
- Catalytic Alkyne Reactions
- Nonlinear Optical Materials Studies
- Analytical Chemistry and Chromatography
- Advanced Synthetic Organic Chemistry
University of Trás-os-Montes and Alto Douro
2016-2025
Association for the Development of Douro Viticulture
2016-2017
Rede de Química e Tecnologia
2011-2016
University of Minho
2002-2004
Centre National de la Recherche Scientifique
1998-2003
Université Paris-Sud
1998-2003
Université Paris Cité
2000-2003
Institut de Chimie Moléculaire et des Matériaux d'Orsay
1998-2001
Photochromic silica nanoparticles (SiO2@NPT), fabricated through the covalent immobilization of silylated naphthopyrans (NPTs) based on 2H-naphtho[1,2-b]pyran (S1, S2) and 3H-naphtho[2,1-b]pyran (S3, S4) or direct adsorption parent (1, 3) onto (SiO2 NPs), were successfully incorporated cotton fabrics by a screen-printing process. Two aqueous acrylic- (AC-) polyurethane- (PU-) inks used as dispersing media. All textiles exhibited reversible photochromism under UV solar irradiation, developing...
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.
Photochromic molecules can reversibly develop color upon irradiation with UV light. These smart molecules, mainly in the naphthopyran family, have been applied success to ophthalmic lenses that darken quickly under sunlight and revert uncolored state after several minutes dark. This slow adaptation absence of light is one limitations due formation an unwanted photoisomer. We designed a new bridged structure which prohibits undesirable, persistent photoisomer thus shows very fast switching...
A series of new photochromic fused-naphthopyrans with an alkyl bridge between the pyran ring and naphthalenic core was synthesized in several steps from 4-(bromomethyl)benzocoumarin. The presence these prevents formation one long-lived photoisomer therefore has a dramatic effect on their properties: UV irradiation common naphthopyrans gives rise to two isomeric colored photoisomers, which fades very slowly is responsible for persistent residual color. excitation uncolored leads only that...
The development of photoresponsive textiles with high color contrast, sunlight response, fast coloration/bleaching, and reversible properties has been a major quest for anticounterfeiting, camouflage, UV protection, fashion. WO3 materials are promising building blocks textile applications, but their application limited by slow bleaching under ambient conditions response. Herein, innovative tungsten oxide-based tunable photochromism were produced low-cost, single-step, scalable solvothermal...
A new indeno‐fused naphthopyran linked to a benzophenone nucleus was synthesized. This photochromic molecule functions as an efficient photoinitiator of radical polymerization under visible light (405 nm), enabling the straightforward manufacture various detailed, soft and thin solid objects directly from colorless liquid polyacrylate resin.
A new type of photochromic naphthopyran with a fused structure was embedded in an organic–inorganic amine–alcohol–silicate hybrid gel producing colourless, transparent and flexible films. Under UV-vis light these materials developed, less than 30 s, intense yellow-orange colours that faded completely the dark 3 min. This behaviour contrasts usual performance common naphthopyrans always generate two coloured species which fade different kinetics, leading to formation residual colour persists...
Hybrid nanomaterials based on the covalent grafting of silylated naphthopyrans (NPTs) onto silica nanoparticles (SiO2 NPs) were successfully prepared and studied as new photochromic materials. They by a two-step protocol consisting (i) NPTs (derivatives from 2H-naphtho[1,2-b]pyran (2H-NPT) 3H-naphtho[2,1-b]pyran (3H-NPT)) silylation microwave-assisted reaction between hydroxyl-substituted 3-(triethoxysilyl)propyl isocyanate, followed (ii) post-grafting SiO2 NPs. In order to study role step,...
By combining photochromic naphthopyran with a Norrish-type II benzophenone photoinitiator, new photoswitchable photoinitiator was created that is activated by the successive absorption of two different wavelengths. This dual-colour used to prepare various thin solid polymeric materials using UV and visible light LED promote formation radicals initiate polymerization an acrylate monomer. The use this system ensures only areas receive double irradiation polymerize, providing simple way control light.
A new photochromic fused benzopyran presenting a bridge between the pyran double bond and benzenic ring was prepared. While UV irradiation of usual benzopyrans leads to formation two colored photoisomers with very different thermal stabilities, studies by laser flash photolysis showed that presence this particular prevents undesirable long-lived TT isomer therefore after solution fades following fast monoexponential decay.
An easy synthesis of photochromic naphthopyrans with a lactone ring linking the naphthalene core to pyran double bond is described. UV irradiation (or exposure sunlight) these uncolored compounds provide single photoisomer an intense orange coloration that returns completely initial state much faster than common used in commercial ophthalmic lenses. A polymeric material doped one lactone‐fused develops (ΔAbs = 0.73) when exposed light for 30 s, at room temperature, and just 1 min. The use...
An efficient synthesis of photochromic fused-naphthopyrans was developed. UV-vis or sunlight irradiation these uncolored compounds in solution led to the formation a single colored photoisomer along with an unusual and bicyclic compound formed through intramolecular photochemical Diels-Alder reaction. Both species faded thermally dark initial form. A mechanism for this transformation is proposed based on NMR studies irradiated solutions. The new have been incorporated into hybrid...
Neutral azo dyes, based on push–pull bithienylpyrrole systems, exhibit thermal isomerisation rates as fast 1.4 μs.