Characterization of novel rhodium(II) dimers with N-phenylacetamido bridging ligands

Duncan, Juliet; Maliński, Tadeusz; Zhu, T. P.; Hu, Zhiyong; Kadish, Karl M.; Bear, John L.

doi:10.1021/ja00384a052

Cited by 28 publications

(17 citation statements)

References 3 publications

(3 reference statements)

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“…The axial coordination with chloride anions (Table 2) resulted in a significant shift towards lower potentials, when compared to the literature data (Table 1). These observations agree with the literature data, that show that redox processes are favored by axial coordination which stabilizes the intermediate species or makes the oxidation process easier by increasing the electron density [17][18][19] . Furthermore, in the presence of higher Cl -levels a decrease in ∆E or about 100 mV for E m1 and 50 mV for E m2 was observed (scan rate of 25 mV s -1 ).…”

Section: Cyclic Voltammetry Behavior Of Soluble [Rh 2 (O 2 Cch 3 ) 4 supporting

confidence: 83%

“…Indeed, for each equatorial group exchanged, a decrease of 225 mV in its midpoint potential E m [where: E m =(E a +E c )/2] is observed 18 . Less intense effects are also observed upon changing ligangs in the axial positions [17][18][19] . Table 1 shows the values for both midpoint potentials (E m1 and E m2 ) obtained for rhodium acetamidates under the same conditions in different solvents.…”

Section: Cyclic Voltammetry Behavior Of Soluble [Rh 2 (O 2 Cch 3 ) 4 mentioning

confidence: 80%

“…Hence, the first cycle is necessary to form [Rh 2 III ] 2+ species, which has higher affinity for anionic species. Furthermore, the interaction between complex and electrolytes may be more effective through the axial position [17][18][19] . For this reason, voltammograms in the presence of coordinating anions such as chloride may exhibit different patterns from those with noncoordinating anions.…”

Section: Electrochemical Behavior Of Rame In Different Electrolytesmentioning

confidence: 99%

“…Rhodium acetamidate was synthesized by stepwise exchange reaction of [Rh 2 (O 2 CCH 3 ) 4 ] with acetamide as previously described 17 . The carbon powder was purchased from BDH (Poole UK).…”

Section: Chemicalsmentioning

confidence: 99%

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Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensor

Gil¹,

Kubota²

2000

J. Braz. Chem. Soc.

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O comportamento eletroquímico do acetamidato de ródio imobilizado em pasta de carbono e as potencialidades para construção de sensores foram avaliados. O complexo imobilizado mostrou boa estabilidade e propriedades redox, sendo observados dois pares redox reversíveis com potenciais médios entre 0,15 e 0,55 V vs SCE. Entretanto, a resolução dos picos voltamétricos mostrou-se dependente do eletrólito suporte. A correlação entre a capacidade coordenante do eletrólito e seus respectivos potenciais médios sugere que o eletrólito deve coordenar-se em posição axial nos complexos. Além disto, a posição axial deve ser o sítio catalítico, sendo que a oxidação de espécies doadoras, como hidrazina, foi catalisada por estes complexos. O baixo potencial (<300 mV) mostra uma boa viabilidade deste composto para a confecção de sensores para a hidrazina, minimizando problemas de interferentes. Uma boa faixa de resposta linear para a hidrazina foi ajustada pela equação i = 23,13 (± 0,34) c , onde i = corrente em mA and c = concentração em mol dm -3 na faixa de 10 -5 a 10 -2 mol dm -3 . O baixo tempo de resposta (~1 s) poderia ser útil em análises por injeção em fluxo. Este sistema foi bem estável e apresentou boa repetibilidade, mesmo após 30 medições, com uma variância de 0,5 %.The electrochemical behavior of rhodium acetamidate immobilized in carbon paste electrode and the consequences for sensor construction were evaluated. The electrode showed good stability and redox properties. Two reversible redox couples with midpoint potentials between 0.15 and 0.55 V vs SCE were observed. However, peak resolution in voltammetric studies was very dependent on the supporting electrolyte. The correlation between coordinating power of the electrolyte and peak potential suggests that the electrolyte can coordinate through the axial position of the complexes. Furthermore, the axial position may be also the catalytic site, as a catalytical response was observed for hydrazine oxidation. A good linear response range for hydrazine was fit by the equation i = 23.13 (± 0.34) c , where i = current in mA and c = concentration in mol dm -3 in the range of 10 -5 up to 10 -2 mol dm -3 . The low applied potential (<300 mV) indicates a good device for hydrazine sensor, minimizing interference problems. The short response time (~1 s) may be useful in flow injection analysis. Furthermore, this system was very stable presenting good repeatability even after 30 measurements with a variance of 0.5 %.

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Section: Cyclic Voltammetry Behavior Of Soluble [Rh 2 (O 2 Cch 3 ) 4 supporting

confidence: 83%

Section: Cyclic Voltammetry Behavior Of Soluble [Rh 2 (O 2 Cch 3 ) 4 mentioning

confidence: 80%

Section: Electrochemical Behavior Of Rame In Different Electrolytesmentioning

confidence: 99%

Section: Chemicalsmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensor

Gil¹,

Kubota²

2000

J. Braz. Chem. Soc.

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“…A síntese do Rh 2 (tfc)4 foi feita através da fusão do Rh 2 (ac)4 com excesso de trifluoroacetamida [19], método pelo qual também são obtidos outros tetra-amidatos de ródio (11) [35][36][37][38][39][40] e onde também são necessárias condições mais drásticas como a fusão, para facilitar a troca de ligantes carboxilatos pelos amidatos. A trifluoroacetamida, além de ligante, comporta-se também como solvente, facilitando a dissolução do Rh 2 (ac)4 após se atingir o seu ponto de fusão.…”

Section: Resultados E Discussõesunclassified

Síntese e caracterização de carboxilatos de Rh(II) e seus adutos com metronidazol: ensaios biológicos com vistas à vtividade radiossensibilizadora de tumores

Negrón¹

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ChemInform Abstract: CHARACTERIZATION OF NOVEL RHODIUM(II) DIMERS WITH N‐PHENYLACETAMIDO BRIDGING LIGANDS

Duncan¹,

Maliński²,

Zhu³

et al. 1983

Chemischer Informationsdienst

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Characterization of novel rhodium(II) dimers with N-phenylacetamido bridging ligands

Cited by 28 publications

References 3 publications

Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensor

Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensor

Síntese e caracterização de carboxilatos de Rh(II) e seus adutos com metronidazol: ensaios biológicos com vistas à vtividade radiossensibilizadora de tumores

ChemInform Abstract: CHARACTERIZATION OF NOVEL RHODIUM(II) DIMERS WITH N‐PHENYLACETAMIDO BRIDGING LIGANDS

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