Supramolecular Chemistry
Mostrando 13-24 de 53 artigos, teses e dissertações.
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13. Estudo espectroscópico, eletroquímico e fotofísico de porfirinas supermoleculares como fotossensibilizadores / Spectroscopy, electrochemical and photophysical studies of supermolecular porphyrins as photosensitizers
Uma série de compostos de transferência de carga baseado em derivados de anilina (grupo doador) e N-alquilpiridínio (grupo receptor) foi preparada e ligada à periferia do anel porfirínico, gerando uma nova série de porfirinas supermoleculares, que foram caracterizadas por espectroscopia eletrônica, voltametria cíclica, espectroeletroquímica, fluores
Publicado em: 2009
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14. Estudos da Redução Assimétrica de Iminas e Chalconas : Síntese de Compostos com Potencial Ação Farmacológica/Tecnológica
Chalcones are defined as α,β-unsaturated ketones in which both the carbonyl and the olefinic fragment are linked to an aromatic ring. They possess a large spectrum of action, such as anti-inflammatory and antioxidant activity in vitro and in vivo. This raises interest in synthesizing and characterizing different chalcones, in order to obtain molecu
Publicado em: 2009
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15. New catalysts based on oxovanadium (IV) and cucurbit[6]uril. / Novos catalisadores à base de oxovanádio (IV) e Cucurbit[6]urila
Cucurbiturils are versatile molecules used in several branches of chemistry. These molecular cages form a family of homologues from the condensation of glycoluril and formaldehyde in acidic medium. Their applications range from catalysis, photochemistry, organic and inorganic synthesis, materials and supramolecular chemistry. Particularly cucurbit[6]uril, or
Publicado em: 2009
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16. A química supramolecular de complexos pirazólicos
The purpose of this review is to describe the progress in the supramolecular chemistry of the pyrazolyl-based metal complexes. The text is written under the structural point of view, emphasizing the role of the covalent and non-covalent interactions in the rational construction of super and supramolecules.
Química Nova. Publicado em: 2008
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17. Propriedades e aplicações recentes das ciclodextrinas
Cyclodextrins (CDs) are cyclic oligosaccharides comprised of six or more glucose units connected by alpha-1,4 bonds. They have hydrophobic cavities with a hydrophilic exterior, and are versatile receptors for a variety of substrates. This ability allows them to be applied in many fields, as distinct as supramolecular chemistry, nanotechnology, pharmaceutical
Química Nova. Publicado em: 2008
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18. Hybrid metal-organic nanocomposites based on vandium pentoxide / Nanocompósitos híbridos metal-orgânicos baseados em pentóxido de vanádio
Nanostructured systems based on the intercalation of molecular and supramolecular species into lamellar vanadium pentoxide xerogels are focused on this Thesis. The exciting characteristics of the supramolecular systems which are closely related to the nature, interaction and organization of the chemical species involved, have been exploited aiming their appl
Publicado em: 2008
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19. Singularities related to the electrosteric stabilization mechanism and their effects over the rheological behaviour of concentrated suspensions. / Singularidades associadas ao mecanismo de estabilização eletroestérico e seus efeitos sobre o comportamento reológico de suspensões concentradas.
O presente projeto de trabalho buscou avaliar e estabelecer relações de causa e efeito que justificassem a ocorrência de singularidades no comportamento reológico de formulações complexas contendo elevada carga de sólidos em suspensão incorporada. O mecanismo de estabilização coloidal empregado para preparação das formulações e posterior análi
Publicado em: 2008
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20. Síntese de bisporfirinas contendo o espaçador 2,2-bipiridina: modelos na elaboração de sensores luminescentes de íons metálicos / Synthesis of bisporphyrins held together by the 2,2-bipyridine spacer: models in the elaboration of luminescent sensors for metal ions
In this work have been synthesized bisporphyrins held together by means of amide linkage at the 4,4position of 2,2-bipyridine, reacting the mono-functionalised aminophenyl-porphyrin (NH2PTriPP) and 4,4-diacid chloride bipyridine (DACBipy). A preliminary study was conducted for the establishment of the reaction conditions for the attainment of mono(nitropheny
Publicado em: 2008
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21. Estratégia supramolecular para a nanotecnologia
Brazilian science is evolving rapidly and steadly in the last 10 years, reaching the 15º place in the international ranking. Research in nanotechnology is following a similar way generating new scientific and technological knowledge in several frontiers but specially in the interfaces of two or more areas, where Chemistry is consolidating itself as a centra
Química Nova. Publicado em: 2007-12
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22. Cucurbiturilas
This review article describes the properties and the main applications of the glicol[n]urils. These compounds are cavitands made of n glycolurilic units arranged in circles, giving rise to extremely symmetric toroidal molecules. The cucurbit[n]urils create this way variable-sized hydrophobic cavities and the glycolurilic carbonyles delimit two portals on the
Química Nova. Publicado em: 2007-10
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23. Estudo e caracterização estrutural e termodinâmica de compostos de inclusão formados entre antidepressivos e ciclodextrinas
In this work the supramolecular systems stabilized by the non-covalent interactions, formed by association of the ß-cyclodextrin with a bicyclic and a tricyclic antidepressant, Fluoxetine and Imipramine respectively, were investigated by spectroscopies techniques (FT-IR, FTIR-HATR and NMR), thermal analysis (TGA and DSC) and also by calorimetric technique (
Publicado em: 2007
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24. Criptatos de lantanÃdeos derivados de Ãcidos piridina dicarboxÃlicos: modelagem, sÃntese, caracterizaÃÃo e estudo espectroscÃpico
O design e a sÃntese de ligantes macrocÃclicos e seus complexos luminescentes de lantanÃdeos (Ln) sÃo uma fascinante Ãrea de pesquisa devido a sua importÃncia em processos bÃsicos e em quÃmica aplicada. A habilidade destes ligantes em encapsular Ãons trivalentes lantanÃdeos, bem como sua singular eficiÃncia em absorver a radiaÃÃo ultravioleta, t
Publicado em: 2007