Simultaneous EPR electrochemical measurements on polypyrrole in ambient temperature ionic liquids

Oudard, Jean Francois; Allendoerfer, Robert D.; Osteryoung, R. A.

doi:10.1016/0022-0728(88)85128-3

Cited by 38 publications

(11 citation statements)

References 22 publications

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“…While they obtained results similar to those reported by Osteryoung et al [144,145], in [P 14,6,6,6 ] salts, lower rotational activation energy values were found than for the viscosity flow, suggesting that TEMPO resides in zones of lower microviscosity. The authors therefore suggested a bilayered structure for the mixture (see Fig.…”

Section: Epr Spectroscopy In Ionic Liquidssupporting

confidence: 79%

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Magnetic resonance spectroscopy in ionic liquids

Bankmann

Giernoth

2007

Progress in Nuclear Magnetic Resonance Spectroscopy

102

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Section: Epr Spectroscopy In Ionic Liquidssupporting

confidence: 79%

“…Osteryoung et al were probably the first to report EPR spectroscopy in ionic liquids [144]. They performed simultaneous EPR, current and charge measurements on polypyrrole films in [emim]Cl/AlCl 3 melts and found strong correlation between peak current and maximum EPR absorption.…”

Section: Epr Spectroscopy In Ionic Liquidsmentioning

confidence: 97%

Magnetic resonance spectroscopy in ionic liquids

Bankmann

Giernoth

2007

Progress in Nuclear Magnetic Resonance Spectroscopy

102

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“…[5][6][7] However, the chloroaluminate ionic liquids used in these investigations were moisture sensitive. In more recent times, it has been shown that conducting polymers can be electrosynthesized in the ambient temperature imidazolium-based ionic liquids with anions such as hexafluorophosphate or tetrafluoroborate.…”

mentioning

confidence: 99%

The Formation of Polypyrrole at Iron from 1-Butyl-3-methylimidazolium Hexafluorophosphate

Fenelon

Breslin

2005

J. Electrochem. Soc.

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The ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate, was used to deposit adherent and highly conducting polypyrrole coatings at pure iron using a simple potentiostatic technique. Adherent and highly conducting polypyrrole films were formed at the iron substrate using potentials in the range from 1.0 to 1.4 V and with pyrrole concentrations between 0.1 and 0.3 mol dmϪ3 . An increase in the applied potential, or the concentration of the monomer, gave rise to an increase in the rate of polymer growth. The polypyrrole-coated iron electrodes were electroactive and remained highly conducting and stable in the ionic liquid. Using electrochemical impedance spectroscopy, the charge-transfer resistance of the uncoated iron electrode was determined as 1.25 ϫ 10 4 ⍀ cm 2 compared to the much lower resistance of 1.90 ϫ 10 2 ⍀ cm 2 measured for the highly conducting polypyrrolecoated electrode in the ionic liquid. The room temperature ionic liquid systems based on the N,NЈ-dialkyl-substituted imidazolium cations have attracted increasing attention and interest in recent years.1-4 This is not surprising in light of their promising physical and chemical properties, which include high ionic conductivity, negligible volatility, nonflammability, excellent thermal and chemical stability, air and moisture stability, and, in terms of electrochemistry, a wide potential window.Research into the formation, or properties, of conducting polymers in ionic liquids dates back to the mid 1980s, with the work of Osteryoung and co-workers.5-7 However, the chloroaluminate ionic liquids used in these investigations were moisture sensitive. In more recent times, it has been shown that conducting polymers can be electrosynthesized in the ambient temperature imidazolium-based ionic liquids with anions such as hexafluorophosphate or tetrafluoroborate. [8][9][10][11][12][13][14] But of more significance is the fact that the conducting polymers cycled in, or electropolymerized from, these imidazolium-based ionic liquids exhibit greatly enhanced electrochemical stability, negligible polymer degradation and fast switching speeds. [8][9][10][11][12][13][14] For example, Lu et al. 10 found that polyaniline, polypyrrole, and polythiophene showed negligible loss in electroactivity when cycled in room-temperature ionic liquids composed of 1-butyl-3-methyl imidazolium cations with either tetrafluoroborate or hexafluorophosphate anions. Sekiguchi et al.13,14 used 1-ethyl-3-methylimidazolium trifluoromethanesulfonate as an electrolyte for the electrochemical polymerization of pyrrole. The electrochemical capacity and conductivity of the polypyrrole were significantly increased when prepared from the ionic liquid. Other polymer systems that have been studied in these imidazolium-based ionic liquids include poly͑3,4-ethylenedioxythiophene͒ 15,16 and poly͑2-methoxy-5-͑2Ј-ethylhexyloxy͒-1,4-phenylene vinylene ͑MEH-PPV͒. 17These studies have all been conducted with inert electrodes. Although conducting polymers have been deposited at corrosion susceptib...

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“…However, EPR has been employed to probe radical transition states. This can be particularly useful for electrochemical reactions as shown by Osteryoung et al 106 with transitional radical cations in polypyrrole films in [emim]Cl/AlCl 3 or by Kucherov et al 107 who detected W/Mo(V) species with EPR during olefin metathesis in ionic liquids. Osteryoung et al also used several spin probes to investigate donor/acceptor properties and hydrogen bonding in chloroaluminate ionic liquids.…”

Section: Nmr/eprmentioning

confidence: 99%

Metal complexation in ionic liquids

Abbott

Frisch

Ryder

2008

Annu. Rep. Prog. Chem., Sect. A: Inorg. Chem.

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This Chapter reviews the area of inorganic complexes in ionic liquids. It focuses primarily on the literature published during the calendar year 2007 but more generally it discusses the lack of information and the problems associated with collecting data in these solvents. The applications in which inorganic complexes play a vital role are highlighted in this review together with the importance that speciation plays in controlling the chemistry of metal ions.

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Simultaneous EPR electrochemical measurements on polypyrrole in ambient temperature ionic liquids

Cited by 38 publications

References 22 publications

Magnetic resonance spectroscopy in ionic liquids

Magnetic resonance spectroscopy in ionic liquids

The Formation of Polypyrrole at Iron from 1-Butyl-3-methylimidazolium Hexafluorophosphate

Metal complexation in ionic liquids

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