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Volumn 107, Issue 5, 2003, Pages 745-752

Reactivities of some electrogenerated organic cation radicals in room-temperature ionic liquids: Toward an alternative to volatile organic solvents?

Author keywords

[No Author keywords available]

Indexed keywords

ELECTROGENERATED ORGANIC CATION RADICALS; ELECTRON TRANFER KINETICS; KINETICS PARAMETERS; ROOM TEMPERATURE IONIC LIQUIDS; VOLATILE ORGANIC SOLVENTS;

EID: 0037421860     PISSN: 10895639     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp026907w     Document Type: Article
Times cited : (255)

References (76)
  • 10
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    • U.S. Patent No. 2,445,331, Aug 3
    • (a) Hurley, F. H.; U.S. Patent No. 2,445,331, Aug 3, 1948.
    • (1948)
    • Hurley, F.H.1
  • 11
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    • U.S. Patent No. 2,446,349, Aug 3
    • (b) Wier, T. P.; Hurley, F. H. U.S. Patent No. 2,446,349, Aug 3, 1948.
    • (1948)
    • Wier, T.P.1    Hurley, F.H.2
  • 12
    • 0013437413 scopus 로고
    • U.S. Patent No. 2,446,350, Aug 3
    • Wier, T. P. U.S. Patent No. 2,446,350, Aug 3, 1948.
    • (1948)
    • Wier, T.P.1
  • 25
    • 0013389702 scopus 로고    scopus 로고
    • note
    • Oxidation reactions were preferably investigated to reduction reactions because of the limitations due to the imidazolium cation in the electroactivity windows in the negative region. For example, in classical organic solvent (acetonitrile, dimethylformamide, etc.), the well-known reduction of anthracene exhibits a monoelectronic and reversible electro-chemical process around - 1.89 V/SCE. In alkylimidazolium-based ionic liquids ([BMIM][PF6], [BMIM][NTf2], and [EMIM][NTf2]), we were not able to see the reduction wave of anthracene because the cathodic window limit is narrowed by the reduction of alkylimidazolium ions at -1.8-2 V/SCE.
  • 32
    • 0013389703 scopus 로고    scopus 로고
    • note
    • 2], respectively, under our experimental conditions. The exact values are strongly dependent on the amount of residual water present in the liquid ionic.
  • 33
    • 0013341760 scopus 로고    scopus 로고
    • Similar results were obtained in the other investigated ionic liquids
    • Similar results were obtained in the other investigated ionic liquids.
  • 36
    • 0013341056 scopus 로고    scopus 로고
    • note
    • 4]. However, it remains that these media are much more viscous than other conventional media.
  • 37
    • 0013393924 scopus 로고    scopus 로고
    • note
    • For example through the Stokes-Einstein equation for a spherical molecule D = kT/6πηa, where k is the Boltzmann constan, η the viscosity, and a is the solvodynamic radius of the diffusing species.
  • 41
    • 0003939938 scopus 로고    scopus 로고
    • Lund, H., Hammerich, O., Eds.; Marcel Dekker Inc: New York
    • Organic Electrochemistry 4th ed.; Lund, H., Hammerich, O., Eds.; Marcel Dekker Inc: New York, 2001.
    • (2001) Organic Electrochemistry 4th Ed.
  • 50
    • 0013389706 scopus 로고    scopus 로고
    • note
    • However, to get similar current intensities taking into account the differences in diffusion coefficients, anthracene concentrations in acetonitrile were typically five times lower than that used in the ionic liquids.
  • 51
    • 0013389707 scopus 로고    scopus 로고
    • note
    • 2], the slope was higher (around 25 mV/log(v)) that may indicate a change in the mechanism but because of the higher resistivity of this media, we suspect the effect of some uncompensated IR drop.
  • 56
    • 0013436855 scopus 로고    scopus 로고
    • note
    • As mentioned in the Experimental Section, a Pt wire coated with polypyrrole is used as a quasireference electrode. We checked this quasireference against the ferrocene/ferricinium couple (E° = 0.405 V/SCE).
  • 70
    • 0013389708 scopus 로고    scopus 로고
    • note
    • We checked that the concentrations of water were almost the same in all the ionic liquids (less than a factor 2).
  • 72
    • 0013342053 scopus 로고    scopus 로고
    • note
    • For a comparison between peak currents for the oxidation of the monomer and the reduction of the timer radical cation, one should take into account that the first one corresponds to an exchange of 7 electron per mole against one for the trimer redox couple.
  • 73
    • 0013443120 scopus 로고    scopus 로고
    • note
    • -1.
  • 74
    • 0013388895 scopus 로고    scopus 로고
    • note
    • diff is expected in low polarity solvent because ω(R) > 0 and has mainly an electrostatic origin.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.