Electrochemical Studies on Heptamethine Cyanine Dyes

Kim, Young-Sung; Shin, Jong-Il; Park, Soo-Youl; Jun, Kil-Woung; Son, Young‐A

doi:10.5764/tcf.2009.21.5.035

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…The value of E eg evaluated using onset potentials is closer to the optical band gap than that evaluated using peak potentials because electron transfer occurs through a neutral film around the onset potentials . Although E eg is usually larger than the optical band gap, it is significant in the analysis of the electrochemical properties of fullerene films and their practical applications in some devices (e.g., organic solar cells). , Therefore, through the analysis of E eg , the effect of the surrounding medium on the interfacial barrier between a fullerene film and a Au(111) electrode can be estimated.…”

Section: Resultsmentioning

confidence: 99%

“…By means of electron-energy-loss spectroscopy (EELS), the optical band gaps have been estimated to be 1.7 eV for C 60 and 1.8 eV for C 70 . However, electrochemical measurements reveal larger band gaps. , In general, E eg has been reported to be larger than the optical band gap. ,− , This difference can be explained by the interfacial barrier between the film and the electrode surface . The value of E eg evaluated using onset potentials is closer to the optical band gap than that evaluated using peak potentials because electron transfer occurs through a neutral film around the onset potentials .…”

Section: Resultsmentioning

confidence: 99%

“…E 0/1+ – E 1–/0 , the potential difference between the first redox potential for reduction and that obtained for oxidation (the electrochemical band gap, E eg ), roughly approximates the HOMO–LUMO gap. − E eg was also estimated as the difference between the onset potential of the first reduction peak and the first oxidation peak. DPV was used to determine the onset potentials.…”

Section: Experimental Sectionmentioning

confidence: 99%

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Dependence of the Electrochemical Redox Properties of Fullerenes on Ionic Liquids

Ueda¹,

Yoshimura²,

Nishiyama

2017

Langmuir

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Control of the electrochemical properties of fullerenes via the chemical modification approach has attracted considerable attention. However, surface modification of fullerene cages with various functional groups can lead to the destruction of their original structures. Herein, we report a simple approach for controlling the electrochemical properties of fullerene thin films formed on Au(111) electrodes in various ionic liquids (ILs). A total of eight reversible redox couples for six reductive and two oxidative processes were observed for fullerenes in ammonium- and pyrrolidinium-based ILs. The redox potentials, the differences between two successive redox potentials, the average values of these potential differences for fullerene reduction, and the electrochemical band gaps of fullerene films in various ILs were found to depend on the cation and its alkyl chain length, the anion, and the chemical structure of the fullerene. Highly charged C anions were reduced more easily than C anions. An increase in the alkyl chain length of the cation led to an increase in the average potential difference between two successive redox potentials for fullerene reduction. The results indicate that the electrochemical band gaps of fullerenes can be manipulated using ILs with appropriate anions, which can be determined based on the size of the anion and the charge distribution.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

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Dependence of the Electrochemical Redox Properties of Fullerenes on Ionic Liquids

Ueda¹,

Yoshimura²,

Nishiyama

2017

Langmuir

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“…0.42V was applied for E 1/2 (Ferrocence) value in this equation 4,[15][16][17][18] . LUMO values using onset and peak potentials for pyrene based molecule were obtained for -3.37eV and -3.13eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Study on Energy Potential Levels with Pyrene Molecule

Kim¹,

Li²,

Son³

2013

Textile Coloration and Finishing

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Pyrene based molecule has been synthesized through the reaction of pyrene-1-carboxaldehyde and 4-phenylthiosemicarbazide in this research. The pyrene based molecule showed specific optical properties such as absorption and emission changes after mixing with fluoride in DMSO. The phenomenon is induced by the interaction of the molecule and fluoride. This interaction may affect to electron distributions and potential energy levels. In this regard, synthesized pyrene based molecule has been investigated for its electron distributions and HOMO/LUMO energy levels depending on interaction with fluoride. The absorption measurement, cyclicvoltammograms and computational method were investigated to calculate and compare energy potential levels.

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