Buscar
Itens para a visualização no momento 111-120 of 365
Síntese, caracterização, estudo fotofísico e interação molecular de novas calcogenoporfirinas derivadas da 5,10,15,20–tetrakis(pentafluorofenil)porfirina
(Universidade Federal de Santa Maria, 2019-02-18)
The present work had as main objective the synthesis of new chalcogenporphyrins derived from
5,10,15,20-Tetrakis(pentafluorophenyl)porphyrin, characterization, study of photophysical
properties and analysis of biomolecular ...
1,3,4-oxadiazóis: estratégias para síntese e derivatização a partir do ácido 4-oxopentanóico
(Universidade Federal de Santa Maria, 2014-12-19)
This study shows strategies to prepare 1,3,4-oxadiazoles and derivatives from 4-oxopentanoic acid is reported. The compounds 4-(2-(5-substituted-1,3,4-oxadiazol-2-yl)ethyl)-2-(methylthio/phenyl)-6-(trifluoromethyl)pyrimidine; ...
Aplicação de ultrassom para remoção de enxofre e de nitrogênio do óleo diesel: avaliação de parâmetros do processo e determinação de enxofre e de nitrogênio por técnicas espectrométricas e cromatográficas
(Universidade Federal de Santa Maria, 2011-09-29)
In the present work, the ultrasound assisted oxidation of sulfur and nitrogen compounds present in diesel fuel was investigated. The oxidized compounds are more polar than their original forms and can be removed from oil ...
Engenharia de cristais: estudo conformacional, topológico e energético de t-butilpirazóis e bis-t-butilpirazóis
(Universidade Federal de Santa Maria, 2019-02-22)
This work presents a proposed crystallization mechanism and conformational study of regioisomers of 5(3)-aryl-3(5)-carboxyethyl-1-(1,1-dimethylethyl)-1H-pyrazole (aryl, 4-X-C6H4, where X = H, F, Cl and Br) and a series of ...
Síntese, análise estrutural, luminescência e atividade biológica de complexos de metais de transição com ligantes derivados de benzoilidrazina e feniltiossemicarbazida
(Universidade Federal de Santa Maria, 2019-01-30)
This work reports the synthesis and characterization of new complexes with 2,6-diacetylpyridine-bis(benzoylidrazone) (L1) and 2,6-diformylpyridine-bis(4-phenylthiosemicarbazone) (L2) ligands. The complexes [(L1)2Ce]Cl3.14H2O ...
Interação entre líquidos iônicos imidazolíneos e os alginatos de sódio e hidroxâmico
(Universidade Federal de Santa Maria, 2019-01-30)
This work describes the interactions between sodium alginate (ALG) and hydroxamic
alginate (AHX) with the monocationic imidazolium ionic liquids series (CnMIMBr).
From the surface tension, electrical conductivity, ...
Influência do tratamento culinário na concentração e biodisponibilidade in vitro de metais, não-metais e espécies de arsênio em frutos do mar
(Universidade Federal de Santa Maria, 2015-07-01)
Over the last decades a wide variety of analytical methods and bioavailability, interactions, metabolism and toxicity studies were performed in order to evaluate the risks associated with contamination of heavy metals in ...
Interação entre líquidos iônicos mono e dicatiônicos derivados do imidazolíneo e metilcelulose em solução aquosa e estado gel
(Universidade Federal de Santa Maria, 2016-07-28)
This paper describes the interactions between methylcellulose (MC) with a serie of imidazolium ionic liquids (LIs) monocationic (CnMIMBr) and its similar dicationic (Cn(MIM)2Br2) in a aqueous enviroment. The effect of the ...
Métodos de preparo de amostras para a posterior determinação de halogênios em solos contendo elevados e baixos teores de matéria orgânica empregando técnicas de cromatografia e de espectrometria atômica
(Universidade Federal de Santa Maria, 2016-08-11)
In this work, four sample preparation methods were evaluated for further determination of F and Cl by ion chromatography (IC) and Br and I by inductively coupled plasma mass spectrometry (ICP-MS) in soils with variable ...
Síntese e estudo físico-químico de 1,3-imidazóis 2,4,5-trissubstituídos derivados de benzocalcogenazóis
(Universidade Federal de Santa Maria, 2016-07-29)
In the following work, an unprecedented series of 2,4,5-trisubstituted 1,3-imidazoles were synthesized from 1,2-diketones and aryl aldehydes, targeting the union of two classes of heterocyclic rings, the imidazoles and ...