Electrochemical behaviour of [Ru(4,4′-Me2bpy)2(PPh3)(H2O)](ClO4)2 in homogeneous solution and incorporated into a carbon paste electrode. Application to oxidations of benzylic compounds

Lima, Éder C.; Fenga, Paula Gonçalves; Romero, Juan; Giovani, Wagner Ferraresi De

doi:10.1016/s0277-5387(97)00306-9

Cited by 57 publications

(34 citation statements)

References 27 publications

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“…The oxidation of cycle-hexenol had an excellent yield to form cycle-hexenone, and toluene produced benzoic acid, as expected. Table 1 shows that the yields obtained for the substrates studied in this work were most of the time better than those obtained using similar ruthenium catalysts, either mixed homogeneously [14][15][16][17][18][19] or supported in a carbon paste electrode. 18 An important advantage of the catalyst immobilized on the ME is that it can be easily removed from the reaction vessel, it can be fully recovered, and the products can be extracted in a conventional way.…”

Section: Resultsmentioning

confidence: 83%

“…The type of azo bond employed in this work has been previously used to anchor a quinolin moiety to complex transition metals. 6 The synthesis of the BAP-Ru complex was performed by complexing RuCl 3 on the bipyridine moiety 18 and then substituting the chlorine atoms by triphenilphosphine and aqua. The total yield obtained was 65.4%.…”

Section: Resultsmentioning

confidence: 99%

“…18 The poly-(BAP-Ru) film was electropolymerized on the carbon rod electrode using 0.074 g (0.073 mmol) of the complex dissolved in 15 mL of a TBAP/CH 2 Cl 2 0.1 mol L -1 solution. The potential interval used was from +0.50 to +0.75 V at 25 mV s -1 .…”

Section: Preparation Of the Cis-[ru(bap)(bpy)(pph 3 )(Oh 2 )](Clo 4 )mentioning

confidence: 99%

“…[10][11][12][13] Phenyl allyl ethers derived from aromatic phenols can be easily electrochemically polymerized on carbon electrodes to produce a modified electrode with good mechanical and chemical stability. 6,[14][15][16][17][18][19] The electropolymerization of the monomer to form this type of film can be performed by doing scans within a potential interval less positive than the oxidation potential of the functional group to preserve the key moiety.Modified electrodes (ME) can also be prepared using phenol compounds functionalized with azo groups as the key structure to anchor a variety of ligands which can be used Steter et al 661 Vol. 19, No.…”

mentioning

confidence: 99%

“…These substrates were chosen because of their structural variety and because most of them have been previously studied in homogeneous catalysis using similar ruthenium complexes. 6,12,[14][15][16][17][18][19] Based on the known extinction coefficient for each organic substrate it was possible to calculate the variation …”

mentioning

confidence: 99%

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Modified electrodes prepared with polyphenolic film containing ruthenium complex and metal ligand anchored by azo covalent bond

Steter¹,

Pontólio²,

Campos³

et al. 2008

J. Braz. Chem. Soc.

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Este trabalho apresenta dois novos eletrodos de grafite modificados que foram preparados via polimerização da função fenólica, previamente funcionalizada por grupos azo (bipiridina e 2-metoxipiridina), que atuam como estruturas chaves para a ancoragem de ligantes de interesse. As sínteses dos monômeros BAP (4-([2,2']bipiridinil-4-ilazo)-fenol) e PAPmetóxi (5-(4-hidroxifenilazo)piridin-2-metóxi) foram simples, deram bons rendimentos e os monômeros foram facilmente eletropolimerizados, levando à formação de eletrodos modificados (EM) química e mecanicamente estáveis. Em solução aquosa e em circuito aberto, o EM PAP-metóxi formou complexos estáveis com Cd, Cu e Pb, produzindo picos redox bem definidos, demonstrando o grande potencial deste eletrodo para futuras aplicações analíticas. O monômero BAP foi utilizado para produzir um complexo de rutênio (BAP-Ru) que foi eletropolimerizado entre +0.50 e +0.75V (vs. Ag/AgCl), permitindo que o rutênio permanecesse disponível para atuar como catalisador. O EM BAP-Ru oxidou seletivamente uma variedade de substratos orgânicos dando produtos com rendimentos próximos ou melhores que aqueles obtidos por catálise homogênea com complexos de rutênio similares, ou quando este tipo de catalisador é impregnado em pasta de carbono.This work presents two new modified carbon electrodes which were prepared via the polymerization of a phenolic moiety previously functionalized with azo groups (bipyridine and 2-methoxypyridine) as key structures to anchor the desired ligands. The syntheses of BAP (4-([2,2']-bipyridinyl-4-ylazo)-phenol) and PAPmethoxy (5-(4-hidroxyphenylazo) pyridin-2-methoxy) were simple to perform, gave good yields and the monomers were easily electropolymerized resulting in chemically and mechanically stable modified electrodes. The PAPmethoxy ME formed stable complexes with Cd, Cu and Pb in aqueous media at open circuit and produced well defined redox peaks, showing good potential for future analytical applications. The BAP monomer was used to produce a ruthenium complex (BAP-Ru) which was electropolymerized from +0.50 to +0.75V (vs. Ag/AgCl) to leave the ruthenium available to act as a catalyst. The BAP-Ru ME was able to oxidize a variety of organic substrates with good selectivity. The yields obtained were either similar to, or better than, those obtained by homogeneous catalysis using a similar ruthenium catalyst or when this type of catalyst is supported in a carbon paste electrode. Keywords: metal complexation, polyphenolic film, ruthenium IntroductionThe modification of an electrode surface by an organic polymeric film functionalized either by a metal complex or a metal ligand has been broadly studied due to its applications on light absorption involving electron and energy transfer 1-5 and electrocatalysis, 6-9 as well as for its use as a sensor for trace analysis in a variety of media. [10][11][12][13] Phenyl allyl ethers derived from aromatic phenols can be easily electrochemically polymerized on carbon electrodes to produce a modified electrode with good mechani...

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Preparation Of the Cis-[ru(bap)(bpy)(pph 3 )(Oh 2 )](Clo 4 )mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Modified electrodes prepared with polyphenolic film containing ruthenium complex and metal ligand anchored by azo covalent bond

Steter¹,

Pontólio²,

Campos³

et al. 2008

J. Braz. Chem. Soc.

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Unexpected Promotional Effects of Alkyl‐Tailed Ligands and Anions on the Electrochemical Generation of Ruthenium(IV)‐Oxo Complexes

et al. 2021

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Electro-generation of Ru IV =O species from the Ru II -aqua complex is a crucial step to excel the electrocatalytic water oxidation performance of ruthenium oxo complexes. We report herein the synthesis and X-ray crystal structural characterizations of new Ru II -aqua complexes containing N-substituted 2,2'-dipyridylamine ligands (L) tagged with an alkyl chain of various lengths, [Ru(tpy)(L)(OH 2 )] 2 + . Cyclic voltammetric analyses show that the length of the alkyl chain exerts great influence on the electro-generation of Ru IV =O species. The L with a longer alkyl chain in an acidic aqueous medium promotes the conversion of Ru III À OH to Ru IV =O efficiently. Surprisingly, this conversion can be further enhanced by the presence of perchlorate anions. Chronocoulometric data reveal that the alkyl chain on L promotes the adsorption of the ruthenium complex on the electrode surface. Bulk electrolysis results indicate that the [Ru(tpy)(dppa)(OH 2 )] 2 + (dppa = (2,2'dipyridyl)-n-propylamine) gives the most active electrocatalytic water oxidation activity among the ruthenium-aqua complexes investigated in this study.

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Removal of Brilliant Green Dye from Aqueous Solutions Using Home Made Activated Carbons

Calvete

Lima

Cardoso

et al. 2010

CLEAN Soil Air Water

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Activated carbon materials were prepared from the Brazilian pine-fruit shell (Araucaria angustifolia) by chemically activated carbon (CAC) and chemically and physically activated carbon (CPAC), and tested as adsorbents for the removal of brilliant green (BG) dye from aqueous effluents. The mixed activation process leads to increases in the specific surface area, average porous volume, and average porous diameter of the adsorbent CPAC when compared to CAC. The effects of shaking time, adsorbent dosage and pH on the adsorption capacity were studied. BG uptake was favorable at pH values ranging from 2.0 to 10.0 for both CAC and CPAC. The contact time required to obtain the equilibrium using CAC and CPAC as adsorbents was 4 h at 298 K, respectively. The fractionary-order kinetic model provided the best fit to experimental data compared with other models. Equilibrium data were better fit to the Sips and Redlich-Peterson isotherm models using CAC and CPAC as adsorbents. The enthalpy and entropy of adsorption of BG were obtained from adsorption experiments ranging from 298 to 323 K. IntroductionDyes are a kind of organic compound with a complex aromatic molecular structure that can bring bright and firm color to other substances. However, the complex aromatic molecular structures of dyes make them more stable and more difficult to biodegrade [1,2]. The extensive use of dyes in different kinds of industries often poses pollution problems in the form of colored wastewater discharged into environmental water bodies [3].The most efficient method for the removal of synthetic dyes from aqueous effluents is the adsorption procedure [4][5][6]. This process transfers the dye species from the water effluent to a solid phase thereby keeping the effluent volume to a minimum [7][8][9]. Subsequently, the adsorbent can be regenerated or stored in a dry place without direct contact with the environment [5][6][7][8][9].Activated carbon is the most employed adsorbent for toxic species removal from aqueous effluents because of well-developed pore structures and a high internal surface area that leads to its excellent adsorption properties [10,11]. Besides these physical characteristics, the adsorption capacity is also dependent on the source of organic material employed for the production of the activated carbon [10][11][12][13], as well as the experimental conditions employed in the activation processes [11].Activated carbon can be prepared using a variety of chemical [14] and physical [15] activation methods and in some cases using a combination of both types of methods [16]. Chemical activation is the process where the carbon precursor material is firstly treated with aqueous solutions of dehydrating agents such as H 3 PO 4 , ZnCl 2 , H 2 SO 4 , and KOH. Afterward, the carbon material is dried at 373-393 K to eliminate the water. In a subsequent step, the chemically treated carbon material is heated between 673 and 1073 K under nitrogen atmosphere [11,17]. The physical activation consists of a thermal treatment of previously carbonize...

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Electrochemical behaviour of [Ru(4,4′-Me2bpy)2(PPh3)(H2O)](ClO4)2 in homogeneous solution and incorporated into a carbon paste electrode. Application to oxidations of benzylic compounds

Cited by 57 publications

References 27 publications

Modified electrodes prepared with polyphenolic film containing ruthenium complex and metal ligand anchored by azo covalent bond

Modified electrodes prepared with polyphenolic film containing ruthenium complex and metal ligand anchored by azo covalent bond

Unexpected Promotional Effects of Alkyl‐Tailed Ligands and Anions on the Electrochemical Generation of Ruthenium(IV)‐Oxo Complexes

Removal of Brilliant Green Dye from Aqueous Solutions Using Home Made Activated Carbons

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