First conducting polymer functionalized with covalently linked carborane units

Fabre, Bruno; Chayer, Saïd; Vicente, M. Graça H.

doi:10.1016/s1388-2481(03)00095-x

Cited by 42 publications

(63 citation statements)

References 16 publications

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“…46 These spectra also present bands at 1630 that can be attributed at carbonyl groups formed by overoxidation, an irreversible degradation process of the polymeric chain. [47][48][49] The displacement of the band at 1740 cm -1 , in the tartaric acid FTIR spectrum, to smaller wavenumber (1670 cm -1 ), in the FTIR spectrum of films deposited galvanostatically at 2.5 mA cm -2 , indicates that the tartaric acid should be incorporated in the film as a dopant and that the doping process might happen through the carboxylic groups.…”

Section: Fourier Transform Infrared Red (Ftir) Spectramentioning

confidence: 99%

Electrodeposition of polypyrrole films on aluminum from tartrate aqueous solution

Liu¹,

Oliveira²

2007

J. Braz. Chem. Soc.

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A síntese eletroquímica de filmes de polipirrol em superfícies de alumínio, em meio aquoso contendo ácido tartárico e pirrol, foi realizada através da técnica galvanostática e por voltametria cíclica. Um mecanismo que considera o crescimento de uma camada porosa de óxido de alumínio em paralelo com a eletrodeposição do filme de polipirrol foi proposto. Foi observado que quanto mais homogênea a distribuição dos poros na camada de óxido, menor a resistência oferecida para o crescimento dos filmes de polipirrol. Também foi observado que os filmes de polipirrol depositados por voltametria cíclica são menos uniformes do que aqueles formados galvanostaticamente. Filmes eletrodepositados galvanostaticamente a maiores densidades de corrente são mais propensos ao processo de superoxidação, como mostram os resultados de FTIR. Além disso, filmes de polipirrol depositados a 2,5 mA cm -2 apresentam um melhor desempenho na proteção de superfícies de alumínio contra corrosão.The electrochemical synthesis of polypyrrole films on aluminum surfaces from aqueous solutions containing tartaric acid and pyrrole was performed using cyclic voltammetry and galvanostatic techniques. A mechanism that considers a porous aluminum oxide layer growing in parallel with the polymeric film explains the polypyrrole electrodeposition on aluminum surfaces. The more homogeneous the distribution of pores on the aluminum oxide layer, the smaller is the resistance offered to the polypyrrole film growth. Polypyrrole films deposited by cyclic voltammetry are much less uniform than those galvanostatically formed. Polymeric films galvanostatically deposited at higher current densities were more susceptible to overoxidation processes than those films formed at lower current densities, as demonstrated by FTIR analyses. Furthermore, films formed at low current density perform better on protecting aluminum surfaces against corrosion.

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Section: Fourier Transform Infrared Red (Ftir) Spectramentioning

confidence: 99%

Electrodeposition of polypyrrole films on aluminum from tartrate aqueous solution

Liu¹,

Oliveira²

2007

J. Braz. Chem. Soc.

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“…Incorporation of a neutral carborane unit within a p-conjugated polymer has been reported [15]. The 7,8,9,10,11,hexabromocarborane (CB 11 H 6 Br À 6 ) anion ( Fig.…”

Section: Introductionmentioning

confidence: 97%

Response mechanism of potentiometric Ag+ sensor based on poly(3,4-ethylenedioxythiophene) doped with silver hexabromocarborane

Mousavi

Bobacka

Lewenstam

et al. 2006

Journal of Electroanalytical Chemistry

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“…We have recently deve loped an effi cient and versatile method for the syntheses of mono-and di-carboranylpyrroles [1], and showed that some of these molecules can be used to effi ciently build functionalized conducting polymers [2] and porphyrin macrocycles [3]. Carboranes, both in their neutral closo and anionic nido forms, are unique boron clusters with remarkable thermal, kinetic and photochemical stabilities, as a result of valence electron delocalization [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Syntheses and properties of carboranylpyrroles

Clark

Fabre

Fronczek

et al. 2005

J. Porphyrins Phthalocyanines

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Synthetic routes to mono-and di-carboranylpyrroles (1-5) bearing the carborane groups linked either directly to the 3-and/or 4-positions of the pyrrole ring or via one or two methylene spacers are described. Several X-ray structures of key intermediates are presented and discussed. Carboranylpyrroles can be cyclotetramerized to afford carboranylporphyrins in low to moderate yields, depending on the number of carborane cages and their linkage to the pyrrole ring. The best yields of porphyrin were obtained with pyrrole 3, bearing a two carbon spacer between the carborane and pyrrole units. The electrochemical polymerization of pyrroles 2 and 3 gave functionalized conducting polymer fi lms with increased overoxidation resistance and thermal stability compared with unsubstituted polypyrrole. Dicarboranylpyrrole 4 did not electropolymerize under a variety of experimental conditions, whereas pyrrole 5 formed only soluble oligomers.

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First conducting polymer functionalized with covalently linked carborane units

Cited by 42 publications

References 16 publications

Electrodeposition of polypyrrole films on aluminum from tartrate aqueous solution

Electrodeposition of polypyrrole films on aluminum from tartrate aqueous solution

Response mechanism of potentiometric Ag+ sensor based on poly(3,4-ethylenedioxythiophene) doped with silver hexabromocarborane

Syntheses and properties of carboranylpyrroles

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