Photochemical Synthesis
Mostrando 13-24 de 59 artigos, teses e dissertações.
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13. Síntese, citotoxicidade e estudo da relação estrutura-atividade de novas lactonas sesquiterpênicas derivadas da α-santonina / Synthesis, cytotoxicity and structure-activity relationship study of new sesquiterpene lactones derived from α-Santonin
Considering the wide spectrum of biological activities presented by sesquiterpene lactones, the few studies about the correlation structure-biological activity, as well as the limited availability of these compounds in nature, this work aims the synthesis, cytotoxicity and the study of structure-activity relationship of new sesquiterpene lactones derived fro
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/12/2010
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14. Complexos de metais de transição para o desenvolvimento de novas drogas neuroativas
The biological role and pharmacological utility of histamine and 4-aminopyridine in the physiological medium has led us to the development of luminescent and photolabile metal-histamine and metal-4-aminopyridine donor that release histamine when exposed to visible light aim both research tools and therapeutic agents. In this work, we report on the synthesis,
Publicado em: 2010
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15. Nanoparticulas metalicas anisotropicas : mecanismos de formação e aplicações opticas / Anisotropic metal nanoparticles : formation mechanisms and optical applications
Noble metal nanoparticles have attracted a recent renewed interest due to the new scientific and technological applications exploiting their unique optical properties. At nanometric scale, it is well known that the optical response of metals, related to the excitation of surface plasmons, strongly depends not only on the size of the particles but also on the
Publicado em: 2008
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16. Synthesis and study of photoinduced properties of phenothiazine derivatives on biomimetic systems / Síntese e estudo das propriedades fotoinduzidas de derivados fenotiazínicos em sistemas biomiméticos
The effect of interfaces on photophysical and photochemical properties of methylene blue (MB) and its derivatives was studied in this work, aiming to emploit their potencial as photosensitizers (PS) in photodynamic therapy.The presence of MB in SDS solutions affect the micelle equilibrium decreasing the apparent critical micelle concentration of SDS from 7mm
Publicado em: 2008
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17. Efeitos da inibição da protoporfirinogênio IX oxidase sobre as trocas gasosas e fluorescência da clorofila a em plantas de soja (Glycine max L. Merrill) / Effects of inhibition of protoporphyrinogen oxidase IX on gas exchange and chlorophyll fluorescence of soybean plants (Glycine max L. Merrill)
The photosynthetic fixation of CO2 depends on the capture of light energy by the harvest complex (chlorophyll b and carotenoids), which transfer the energy to the photosystems reaction centers (chlorophyll a). The electrons transfer chain established between the photosystems generates reducing power necessary for the CO2 fixation in the Calvin cycle. The int
Publicado em: 2008
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18. Development of photosensitizing nanoparticles / Desenvolvimento de nanopartículas fotossensibilizadoras
In this work we present the synthesis and the characterization (structural, photophysical, photochemical and photobiological) of nanoparticles with incorporated photosensitizers (PS) Methylene Blue (MB) and Thionin. MB and Thionin were incorporated in sil-MB and sil-Th nanoparticles through sol-gel process. In the case of Cab-Th nanoparticles Thionin was lin
Publicado em: 2007
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19. Estudo de complexos de ferro-cyclam com ligantes carboxilados e polinitrilados / Study of complexes of iron-cyclam with carboxylate ligants and polinitrilate
The main objective of this work is to contribute with the chemistry of the system Fe-Cyclam through the synthesis and characterization of complexes with carboxylate ligants, acetate and oxalate, and polinitrilate ligands, 7,7,8,8-tetracyanoquinodimethane (TCNQ) and tetracyanoethylene (TCNE). The infrared spectra of the cis-[Fe(cyclam)ox]PF6 complex allowed t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/06/2006
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20. Nitrosilo complexos de rutênio com ligantes bifosfínicos: espectroscopia, eletroquímica, estudo da reatividade e liberação de NO. / Ruthenium nitrosyl complexes with diphosphines ligands: spectroscopy,electrochemistry, reactivity study and nitric oxide labilization.
In this thesis some series of ruthenium nitrosyl complexes presenting as common characteristic the presence of diphosphines ligands in their structures, among them: dppm, dppe, c-dppen, dppp, dppb, dcpe and dppf were studied. It was sought in each series to evaluate the electronic properties of the coordinated NO as a function of the changes in the diphosphi
Publicado em: 2005
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21. A novel chlorin derivative of Meso-tris(pentafluorophenyl)-4-pyridylporphyrin: synthesis, photophysics and photochemical properties
A terapia fotodinâmica (TFD) está baseada na administração e no acúmulo de fotossensibilizador, por exemplo, de tipo porfirina ou clorina, em tecidos doentes. As clorinas apresentam propriedades fotofísicas semelhantes àquelas das porfirinas, mas com intensificação e deslocamento das bandas Q, o que faz com que sejam bons candidatos para TFD. Neste
Journal of the Brazilian Chemical Society. Publicado em: 2004-12
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22. Estudo de propriedades eletricas e caracteristicas fisico-quimicas do polipirrol obtido por sintese fotoquimica
The scientific and technological interest for the conducting polymers has increased for the fact of the possibility aplications in substitute to traditional metals. Emphasize the Polianilin, Politiofen, Poli(p-fenilen) and Polypyrrole and its derivatives. The Polypyrrole (PPy) can be obtained by chemistry synthesis, eletrochemistry and more recendy photochem
Publicado em: 2002
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23. Utilização de endoperóxidos de derivados de naftaleno como fontes químicas de oxigênio singlete em sistemas biológicos
Molecular oxygen, in the first excited state (singlet oxygen, ¹O2), has a substantial reactivity towards electron-rich organic molecules, such as biological targets, including unsaturated fatty acids, proteins, RNA and DNA. Considering the complexity of biological systems and the great variety of reactive species generated by photochemistry, efforts have be
Química Nova. Publicado em: 2000-10
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24. Estudos de rotas sinteticas visando a obtenção de terpenos nitrogenados
The search of synthetic routes leading to chiral nitrogen-containing terpenes constitutes the main purpose of this work. The first part deals with the synthesis of chiral tetra-and pentacyclic indolosesquiterpene skeletons presenting the sesquiterpene moiety linked to carbon-2 of the indole unit. The indolosesquiterpene family consists of a small group of ne
Publicado em: 1987