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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Complexos de Ru e Pd com bases de Schiff de ditiocarbazatos com interesse bioinorgânico e quimioterápico / Ru and Pd complexes with dithiocarbazate Schiff Bases focusing on both Bioinorganic and Chemotherapy

Graminha, Angelica Ellen 16 April 2010 (has links)
Made available in DSpace on 2016-06-02T20:36:27Z (GMT). No. of bitstreams: 1 3304.pdf: 3650518 bytes, checksum: 526f179d3d22174b63028fde1e174b66 (MD5) Previous issue date: 2010-04-16 / Universidade Federal de Minas Gerais / The present work reports the synthesis of dithiocarbazate Schiff s bases, which are versatile ligands with a significant interest due to both property and biological application. The focus of this study was the synthesis of bidentate, tridentate and tetradentate Schiff s bases derived from acetophenone, 2-acetylpyridine, benzylacetylacetone and 2,6-diacetylpyridine with S-benzyl and S-pnitrobenzyldithiocarbazate. Such ligands have been characterized through melting point, vibrational absorption spectroscopy in infrared region, elemental analysis, RMN 1H, gCosy gHSQC and gHMBC and electrochemical studies. The crystallographic structure of the ligand S-benzyl-N-(acetophenone)dithiocarbazate (AcFBz) was given. During the characterization of the ligands S-benzyl- (FACACBz) and S-p-nitrobenzyl-N- (benzyacetone)dithiocarbazate(FACACBzNO2 ) the formation of a cyclic ligand, which keeps the molecular formula of the originally proposed structure, was found. From the ligands derived from benzylacetone (FACACBz and FACACBzNO2), 2-acetylpyridine (AcpyBz and AcpyBzNO2) and 2,6-diacetylpyridine (DAPBz e DAPBzNO2), palladium (II) complexes( [Pd(FACACR)PPh3], [Pd(AcpyR)PPh3]PF6 and [Pd(DAPR)] ) have been synthesized with R= Bz or BzNO2. These compounds have been characterized through several techniques and the structure of the complexes [Pd(FACACBz)(PPh3)] and [Pd(FACACBzNO2)(PPh3)] was given. The electrochemical studies of the complexes [Pd(FACACR)PPh3] and [Pd(AcpyR)PPh3]PF6 (R= Bz ou BzNO2) showed distinct electrochemical behavior. Both complexes [Pd(FACACR)PPh3] and [Pd(AcpyR)PPh3]PF6 contain irreversible potential, while the [Pd(FACACR)PPh3] complexes are oxidized by PdII/PdIII and the [Pd(AcpyR)PPh3]PF6 complexes show reduction potential of PdII/PdI. Furthermore, complexes of ruthenium (II) with ligands derived from both 2-acetylpyridine (AcpyBz, AcpyBzNO2) and acetophenone (AcFBz and AcFBzNO2) with different precursors, such as [RuCl2(PPh3)3] and [RuCl2(dpbp)(PPh3)], have been studied. All ruthenium complexes are neutral, because the ligands are anionic due to the deprotonation of one of the nitrogen from the chain. Thus, the ruthenium compounds with bidentate ligand AcFBz and AcFBzNO2 present a xvii general formula [Ru(L)2(PPh3)2] and [Ru(L)2(dppb)], while the tridentate ligands AcpyBz and AcpyBzNO2 form [RuCl(L)(PPh3)2] and [RuCl(L)(dppb)] complexes. The crystallographic structure of the complex [RuCl(AcpyBz)(dppb)] was given. Ruthenium (II) complexes have also been synthesized through Schiff s bases derived from 2,6- diacetylpyridine DAPBz and DAPBzNO2.These compounds, as well as the respective palladium complexes, showed low solubility restricting the use of some techniques in order to characterize them. Cytotoxicity assays of both compounds and their respective ligands have been carried out on cell lines K562 (leukemia myeloid akut), S180 (Murine ascitic Sarcoma) and MDA-MB231 (breast cancer), except the Pd and Ru compounds containing the DAPBz e DAPBzNO2 ligands, due to their low solubility. Cellular viability assays have been carried out in order to ascertain the cytotoxicity of both complexes and their ligands in vitro. In some cases the complexibility improved the activity whereas it has generated selectivity to the complexes in others. / A dissertação relata as sínteses das bases de Schiff de ditiocarbazatos, ligantes versáteis que apresentam considerável interesse devido às suas propriedades e aplicações biológicas. Neste trabalho, investimos na síntese de bases de Schiff bi-, trie tetradentadas derivadas de acetofenona, 2-acetilpiridina, benzoilacetilacetona e 2,6- diacetilpiridina com S-benzil e S-p-nitrobenzilditiocarbazato. Estes ligantes foram caracterizados através de seus pontos de fusão, espectroscopia vibracional de absorção na região do IV, análise elementar, RMN de 1H, gCosy gHSQC e gHMBC e estudos eletroquímicos. A estrutura cristalográfica do ligante S-benzil-N- (acetofenona)ditiocarbazato (AcFBz) foi determinada. Durante as caracterizações dos ligantes S-benzil- (FACACBz) e S-p-nitrobenzil-N-(benzoilacetona)ditiocarbazato (FACACBzNO2) foi observado a formação de um ligante ciclizado que mantem a fórmula molecular da estrutura originalmente proposta. A partir dos ligantes derivados de benzoilacetona (FACACBz e FACACBzNO2), 2-acetilpiridina (AcpyBz e AcpyBzNO2) e 2,6-diacetilpiridina (DAPBz e DAPBzNO2), foram sintetizados complexos de paládio (II) de fórmula geral [Pd(FACACR)PPh3], [Pd(AcpyR)PPh3]PF6 e [Pd(DAPR)] onde R= Bz ou BzNO2. Estes compostos foram caracterizados por diversas técnicas e a estrutura cristalográfica dos complexos [Pd(FACACBz)(PPh3)] e [Pd(FACACBzNO2)(PPh3)] foram determinadas. Os voltamogramas cíclicos dos complexos [Pd(FACACR)PPh3] e [Pd(AcpyR)PPh3]PF6 (onde R= Bz ou BzNO2) apresentam comportamento eletroquímico distintos. Ambos os complexos [Pd(FACACR)PPh3] e [Pd(AcpyR)PPh3]PF6 possuem potenciais irreversíveis, sendo que os complexos [Pd(FACACR)PPh3] sofrem oxidação de PdII/PdIII e os complexos [Pd(AcpyR)PPh3]PF6 apresentam potencial de redução de PdII/PdI. Foram estudados também complexos de rutênio (II) com ligantes derivados da 2-acetilpiridina (AcpyBz, AcpyBzNO2) e ligantes derivados de acetofenona (AcFBz e AcFBzNO2) com diferentes precursores como [RuCl2(PPh3)3] e [RuCl2(dpbp)(PPh3)]. Todos os compostos de rutênio são neutros, pois os ligantes são aniônicos devido a desprotonação de um dos nitrogênio da cadeia. Assim os compostos de rutênio com ligantes bidentados AcFBz e xv AcFBzNO2 apresentam fórmula geral [Ru(L)2(PPh3)2] e [Ru(L)2(dppb)] e os ligantes tridentados AcpyBz e AcpyBzNO2 formam complexos do tipo [RuCl(L)(PPh3)2] e [RuCl(L)(dppb)]. A estrutura cristalográfica do complexo [RuCl(AcpyBz)(dppb)] foi determinada. Foram também sintetisados complexos de rutênio (II) a partir das bases de Schiff derivadas de 2,6-diacetilpiridina DAPBz e DAPBzNO2. Estes compostos, assim como os respectivos complexos de paládio apresentaram baixa solubilidade restringindo a utilização de algumas técnicas para a caracterização dos mesmos. Ensaios de citotoxidade destes compostos e de seus respectivos ligantes foram realizados frente as linhagens celulares K562 (Leucemia mielóide aguda), S180(sarcoma murino acístico) e MDA-MB231 (Câncer de mama), com exceção para os compostos de Pd e Ru contendo os ligantes DAPBz e DAPBzNO2, devido a baixa solubilidade. Ensaios de viabilidade celular foram realizados com o intuito de avaliar a citotoxidade destes complexos e seus ligantes in vitro. Em alguns casos a complexação melhorou a atividade e em outros gerou seletividade aos complexos.

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