Photoinduced Electron Transfer
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. Sunlight-Driven Dehydrogenative Oxidation Photocatalysis by a Mononuclear Complex Acting as both Chromophore and Catalyst
Under simulated solar irradiation in the visible spectral region, the catalytically active RuIV-oxo species [Ru(O)(bpy)(tppz)]2+ (tppz = tetrapyridylpyrazine, a strongly π-accepting tridentate N, N, N-ligand) is produced directly from a single metal-to-ligand charge-transfer (MLCT) photoexcitation of the resting RuII-aquo complex [Ru(H2O)(bpy)(tppz)]2+ in a
J. Braz. Chem. Soc.. Publicado em: 2020-11
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2. A Highly Selective Fluorescent Chemosensor for Al3+ Based on 2,2’:6’,2”-Terpyridine with a Salicylal Schiff Base
Two 2,2’:6’,2”-terpyridine-based Schiff bases (TPySSB and TPySB) have been synthesized. The TPySSB shows remarkable selective ‘off-on’ fluorescence for Al3+ in combination with photoinduced electron transfer (PET) mechanism and C=N isomerization mechanism. Chemosensor TPySSB binds Al3+ in a 1:2 ratio with an association constant 6.8 × 105 (correla
J. Braz. Chem. Soc.. Publicado em: 2020-09
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3. Influence of the Protonatable Site in the Photo-Induced Proton-Coupled Electron Transfer between Rhenium(I) Polypyridyl Complexes and Hydroquinone
In the present work the influence of the distance of the protonatable site of different ancillary ligands to the metal center on the luminescence quenching of ReI polypyridyl complexes by hydroquinone are evaluated by means of experimental and theoretical studies. In these systems, it is expected the occurrence of proton-coupled electron transfer (PCET) reac
J. Braz. Chem. Soc.. Publicado em: 2017-09
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4. Espectroscopia eletrÃnica e solvataÃÃo de cromÃforos zwiteriÃnicos: um estudo ab initio
Pela simplicidade do tratamento teÃrico, fÃcil processabilidade, e possÃveis aplicaÃÃes em ciÃncias dos materiais, oligÃmeros conjugados representam uma classe especial de compostos orgÃnicos. A substituiÃÃo terminal dessas estruturas com grupos doadores (D) e aceitadores de elÃtrons (A) resulta em molÃculas (D - π - A) com propriedades Ãti
Publicado em: 2009
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5. Aspectos químicos e fotoquímicos de liberação controlada de óxido nítrico a partir de complexos nitrosilos de rutênio: ensaios farmacológicos e de citotoxicidade. / Chemical and photochemical aspects of control nitric oxide release from nitrosyl ruthenium complexes: pharmacological and cytotoxic assays.
Nitric oxide (NO) is a multipurpose biological agent that shows important role in brain, arteries, immunological system, liver and lungs. The NO basal level alterations have correlation with several diseases as hypertension, cancer, Raymonds disease and platelet aggregation. Aiming supply this deficient NO level, it was necessary propose new compounds that c
Publicado em: 2008
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6. Estrutura eletronica e polarizabilidades de betainas
This thesis is dedicated to a theoretical study of the electronic structure and optical properties of betaine molecules carried at the semiempirical and ab initio levels. The charge distribution, the dipole moment and the linear (a) and first nonlinear (Ã) polarizabilities of a total of 66 betaine molecules belonging to 6 different families were calculated.
Publicado em: 2007
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7. Desenvolvimento de sistemas polinucleares baseados em clusters trinucleares e complexos poliimínicos de rutênio: unidades de montagem em química supramolecular / Development of polynuclear systems based on trinuclear cluster and polyimines ruthenium compounds: building blocks in supramoleular chemistry
The aim of the work reported is to develop polynuclear structures based on trinuclear ruthenium clusters. All the oligomers are seen as interesting options to the future development of supramolecular devices, due to their photophysical and electrochemical properties. A series of mixed dimers and one trimer were obtained by the combination of the [Ru3O(CH3COO
Publicado em: 2002
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8. Fast photoinduced electron transfer through DNA intercalation.
We report evidence for fast photoinduced electron transfer mediated by the DNA helix that requires metal complexes that are avid intercalators of DNA. Here the donor bis(phenanthroline)(dipyridophenazine)ruthenium(II) [Ru(phen)2dppz2+] and acceptor bis(9,10-phenanthrenequinone diimine)(phenanthroline)rhodium(III) [Rh(phi)2phen3+] intercalate into DNA with Kb
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9. Probing conformational dynamics in single donor-acceptor synthetic molecules by means of photoinduced reversible electron transfer
We use single-molecule fluorescence lifetimes to probe dynamics of photoinduced reversible electron transfer occurring between triphenylamine (donor) and perylenediimide (acceptor) in single molecules of a polyphenylenic rigid dendrimer embedded in polystyrene. Here, reversible electron transfer in individual donor-acceptor molecules results in delayed fluor
National Academy of Sciences.
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10. Classical molecular dynamics simulation of the photoinduced electron transfer dynamics of plastocyanin.
Classical molecular dynamics simulations are used to investigate the nuclear motions associated with photoinduced electron transfer in plastocyanin. The blue copper protein is modeled using a molecular mechanics potential; potential parameters for the copper-protein interactions are determined using an x-ray crystallographic structure and absorption and reso
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11. Light-Induced Electron-transfer Reactions between Chlorophyll a and Hydrogenated Pteridine Derivatives in Solution
Preliminary studies of the formation of cationic 2 - amino - 6, 7 - dimethyl - 4 - hydroxy - 5, 6, 7, 8 - tetrahydropteridine radicals in alcoholic solution are reported. The results indicate that the same type of radical is formed either by oxidizing agents like hydrogen peroxide and iodine, or in a photoinduced reaction with chlorophyll a. A similarity bet
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12. Cytochrome b562 folding triggered by electron transfer: Approaching the speed limit for formation of a four-helix-bundle protein
Ferrocytochrome b562 [Fe(II)cyt b562] folding can be triggered by photoinduced electron transfer to unfolded Fe(III)cyt b562 in 2–3 M guanidine hydrochloride solutions. The folding rates increase with decreasing guanidine hydrochloride; the extrapolated time constant for this folding process in the absence of denaturant (5 μs) is near the predicted value
The National Academy of Sciences.