A5051093323- Porphyrin and Phthalocyanine Chemistry
- Photodynamic Therapy Research Studies
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Molecular Sensors and Ion Detection
- Luminescence and Fluorescent Materials
- Metal complexes synthesis and properties
- Metal-Catalyzed Oxygenation Mechanisms
- Photosynthetic Processes and Mechanisms
- Porphyrin Metabolism and Disorders
- Metal-Organic Frameworks: Synthesis and Applications
- Electrochemical sensors and biosensors
- Synthesis of Organic Compounds
- Analytical Chemistry and Sensors
- Photochemistry and Electron Transfer Studies
- Oxidative Organic Chemistry Reactions
- Organic Chemistry Cycloaddition Reactions
- Nanoplatforms for cancer theranostics
- Bioactive Compounds and Antitumor Agents
- Magnetism in coordination complexes
- Crystallography and molecular interactions
- Electrochemical Analysis and Applications
- Heme Oxygenase-1 and Carbon Monoxide
- Lanthanide and Transition Metal Complexes
- Synthesis and Characterization of Heterocyclic Compounds
Rede de Química e Tecnologia
2015-2024
Universidade do Porto
2015-2024
Faculdade de Tecnologia e Ciências
2015-2017
University of Aveiro
2000-2015
Universidad Complutense de Madrid
2009
Scientific Research Institute of Organic Intermediates and Dyes
2006
National Institute of Engineering, Technology and Innovation
1999
[reaction: see text] The behavior of porphyrins as dipolarophiles in 1,3-dipolar cycloadditions with azomethine ylides was studied. Depending on the nature substituent groups porphyrin macrocycles, reaction can give monoadducts (chlorins) or bisadducts (isobacteriochlorins and bacteriochlorins). When a large excess ylide is used, trisadducts also be obtained. Mixed isobacteriochlorin derivatives were prepared from chlorin previously obtained via Diels-Alder reactions.
Luminescent metal–organic frameworks (LMOFs) are promising materials for lighting and sensing applications. Herein, exposure of the highly luminescent Zn2(bpdc)2(bpee) MOF (H2bpdc = 4,4′-biphenyldicarboxylic acid bpee 1,2-bipyridylethene) to subppm amine contents turns on a new absorption band unambiguously ascribed free molecules concomitant with gradual appearance photoluminescence at shorter wavelengths. These findings combined Fourier-transform infrared spectra, powder X-ray diffraction...
A selective luminescent sensor was fabricated by simply mixing a Tb(<sc>iii</sc>)-based MOF with polymethylmetahacrylate enabling to detect sub-ppb range of nitroaromatic vapours.
Transparent polymeric matrices serve as efficient platforms to immobilize Tb(BTC) crystals whose fluorescence is quenched in the presence of NO<sub>2</sub>.
A. M. G. Silva, C. Tomé, P. S. Neves, Silva and J. Cavaleiro, Chem. Commun., 1999, 1767 DOI: 10.1039/A905016G
An attractive target: Multiple porphyrin systems (see picture for example) are at the center of many synthetic efforts, and efficient strategies preparing valuable building blocks these polycycles much sought after. Herein such a strategy synthesis [1,2,3]triazolo[4,5-b]porphyrin is presented.
A new and efficient process for organic synthesis in aqueous media based on a direct ohmic heating reactor is described. Four representative transformations, Diels–Alder cycloaddition, nucleophilic substitution, an N-alkylation Suzuki cross-coupling reaction, were performed using this process. The results, when compared with those obtained under conventional external (oil bath) microwave heating, showed that allows faster more uniform induced increase of dynamics/mobility charged species...
N-(Porphyrin-2-ylmethyl)glycine was synthesized and used as precursor of azomethine ylide, which trapped with several dipolarophiles. The reaction that ylide dimethyl fumarate afforded the expected adduct. However, 1,4-benzo- 1,4-naphthoquinones only dehydrogenated adducts were isolated. Also, meso-tetrakis(pentafluorophenyl)porphyrin tetraazaporphine allowed access to novel porphyrin-chlorin porphyrin-tetraazachlorin dyads.
A novel technique for the creation of metal-organic framework (MOF) films based on soft-imprinting and their use as gas sensors was developed. The microporous MOF material [Zn₂(bpdc)₂(bpee)] (bpdc = 4,4'-biphenyldicarboxylate; bpee 1,2-bipyridylethene) synthesized solvothermally activated by removing occluded solvent molecules from its inner channels. particles were characterized powder X-ray diffraction fluorescence spectroscopy, showing high crystallinity intense photoluminescence....
Abstract A fast and reversible switch between the neutral protonated porphyrin forms inside a pliable porphyrinic metal–organic framework (MOF), enabled by structural deformation is unveiled. This phenomenon applied for development of MOF‐polymer porous composites to reveal biogenic amines color changes.
The azomethine ylide generated from the reaction of (β-formyl-meso-tetraphenylporphyrinato)nickel(II) with N-methylglycine reacts a range dipolarophiles, yielding new β-substituted-meso-tetraphenylporphyrins. regio- and stereochemistry compounds was established using one- two-dimensional NMR techniques.
Abstract β‐Butadienyl‐ and β,β′‐dibutadienylporphyrins were prepared by the Wittig reaction of β‐formyl‐ β,β′‐diformyl‐ meso ‐tetraphenylporphyrins with allylic phosphorus ylide. Subsequent treatment β‐butadienylporphyrin dienophiles afforded corresponding Diels–Alder adducts. In absence dienophiles, underwent electrocyclization, followed oxidation, to give monobenzoporphyrin in good yield. Similarly, adjacent opposite dibenzoporphyrins successfully synthesized from...
In the present work we describe structure and spectroscopic characterization of a spirocyclic derivative rhodamine B ligand whose properties allow discrimination light-up effects induced by metal ion chelation variation pH. Distinction two is important for use this type to detect monitor ions in aqueous solutions. The synthesis was performed steps, which involve reaction with hydrazine hydrate form hydrazide followed condensation 2-pyridinecarboxaldehyde successfully optimized using solvent...
Abstract A series of rosamine fluorophores was obtained by reaction the appropriate benzaldehyde and 3‐(diethylamino)phenol followed an oxidation step. Both conventional heating microwave irradiation methods were utilized, higher yields in a remarkably shorter period time (10 min) achieved using protocol under closed vessel conditions (80 °C). The nitro‐substituted further converted into corresponding amino derivative through Pd/C‐catalysed hydrogenation. synthetic used for rosamines also...
The microwave-assisted catalytic hydrogenation of the isoxazolidine-fused meso-tetrakis(pentafluorophenyl)chlorin afforded directly a mono-annulated chlorin with singular 1-methyl-2,3-dihydro-1H-benzo[b]azepine ring that resulted from cleavage isoxazolidine N-O bond followed by an intramolecular nucleophilic aromatic substitution o-F atom. subsequent treatment NaH induced second substitution, generating bis-annulated having additional 2H-pyran ring.
Potential bioactive 3-arylquinolin-4(1H)-ones were synthesized under ohmic heating using an efficient, reusable, and ligand-free protocol developed for the Suzuki-Miyaura coupling of 1-substituted-3-iodoquinolin-4(1H)-ones with several boronic acids in water Pd(OAc)2 as a catalyst tetrabutylammonium bromide (TBAB) phase transfer catalyst. Good substrate generality, ease execution, short reaction time, practicability make this method exploitable generation libraries B ring-substituted...
β-Nitro-meso-tetraphenylporphyrin reacts with diazomethane to give a pyrazoline-fused chlorin as the main product. This compound was converted into corresponding pyrazole-fused porphyrin, by treatment DBU, and methanochlorin refluxing in toluene.