Single and double reduction of C-60 in 2:1 gamma-cyclodextrin/[60]fullerene inclusion complexes by cyclodextrin radicals

Annamaria Quaranta; Yongmin Zhang; Yali Wang; Ruth Edge; Suppiah Navaratnam; Edward J. Land; Rene V. Bensasson

doi:10.1016/j.chemphys.2008.10.014

Single and double reduction of C-60 in 2:1 gamma-cyclodextrin/[60]fullerene inclusion complexes by cyclodextrin radicals

Annamaria Quaranta, Yongmin Zhang, Yali Wang, Ruth Edge, Suppiah Navaratnam, Edward J. Land, Rene V. Bensasson

Research output: Contribution to journal › Article › peer-review

Abstract

Spectroscopic and chemical properties of γ-CD radicals, resulting from the abstraction by HO radicals of hydrogen atoms, have been investigated using pulse radiolysis. The reactions of γ-CD radicals with C60 in 2:1 γ-CD/C60 inclusion complexes have been studied in aqueous solutions. It has been demonstrated that the γ-CD radicals are reducing species producing monoanion radicals, as well as doubly reduced , well characterised by their absorption spectra in the near IR. The oxidation potential of γ-CD radical is estimated to be more negative than −390 mV vs. NHE. The kinetics of the C60 reduction by γ-CDradicals have been determined and compared with kinetics by other reducing species including the solvated electron () and radicals. It was observed that the method of preparation of the 2:1 γ-CD/C60 inclusion complexes modifies the C60 reduction mechanism.

Original language	English
Pages (from-to)	174-179
Number of pages	6
Journal	Chemical Physics
Volume	354
Issue number	1-3
DOIs	https://doi.org/10.1016/j.chemphys.2008.10.014
Publication status	Published - 10 Dec 2008

Keywords

2:1 gamma-Cyclodextrin/[60]fullerene inclusion complexes
Pulse radiolysis
Oxidised gamma-cyclodextrin
Fullerene reduction
Reduction potentials
C-60
C-60(2)
9,10-Anthraquinone-2-sulfonate ion

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10.1016/j.chemphys.2008.10.014

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title = "Single and double reduction of C-60 in 2:1 gamma-cyclodextrin/[60]fullerene inclusion complexes by cyclodextrin radicals",

abstract = "Spectroscopic and chemical properties of γ-CD radicals, resulting from the abstraction by HO radicals of hydrogen atoms, have been investigated using pulse radiolysis. The reactions of γ-CD radicals with C60 in 2:1 γ-CD/C60 inclusion complexes have been studied in aqueous solutions. It has been demonstrated that the γ-CD radicals are reducing species producing monoanion radicals, as well as doubly reduced , well characterised by their absorption spectra in the near IR. The oxidation potential of γ-CD radical is estimated to be more negative than −390 mV vs. NHE. The kinetics of the C60 reduction by γ-CDradicals have been determined and compared with kinetics by other reducing species including the solvated electron () and radicals. It was observed that the method of preparation of the 2:1 γ-CD/C60 inclusion complexes modifies the C60 reduction mechanism.",

keywords = "2:1 gamma-Cyclodextrin/[60]fullerene inclusion complexes, Pulse radiolysis, Oxidised gamma-cyclodextrin, Fullerene reduction, Reduction potentials, C-60, C-60(2), 9,10-Anthraquinone-2-sulfonate ion",

author = "Annamaria Quaranta and Yongmin Zhang and Yali Wang and Ruth Edge and Suppiah Navaratnam and Land, {Edward J.} and Bensasson, {Rene V.}",

year = "2008",

month = dec,

day = "10",

doi = "10.1016/j.chemphys.2008.10.014",

language = "English",

volume = "354",

pages = "174--179",

journal = "Chemical Physics",

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TY - JOUR

T1 - Single and double reduction of C-60 in 2:1 gamma-cyclodextrin/[60]fullerene inclusion complexes by cyclodextrin radicals

AU - Quaranta, Annamaria

AU - Zhang, Yongmin

AU - Wang, Yali

AU - Edge, Ruth

AU - Navaratnam, Suppiah

AU - Land, Edward J.

AU - Bensasson, Rene V.

PY - 2008/12/10

Y1 - 2008/12/10

N2 - Spectroscopic and chemical properties of γ-CD radicals, resulting from the abstraction by HO radicals of hydrogen atoms, have been investigated using pulse radiolysis. The reactions of γ-CD radicals with C60 in 2:1 γ-CD/C60 inclusion complexes have been studied in aqueous solutions. It has been demonstrated that the γ-CD radicals are reducing species producing monoanion radicals, as well as doubly reduced , well characterised by their absorption spectra in the near IR. The oxidation potential of γ-CD radical is estimated to be more negative than −390 mV vs. NHE. The kinetics of the C60 reduction by γ-CDradicals have been determined and compared with kinetics by other reducing species including the solvated electron () and radicals. It was observed that the method of preparation of the 2:1 γ-CD/C60 inclusion complexes modifies the C60 reduction mechanism.

AB - Spectroscopic and chemical properties of γ-CD radicals, resulting from the abstraction by HO radicals of hydrogen atoms, have been investigated using pulse radiolysis. The reactions of γ-CD radicals with C60 in 2:1 γ-CD/C60 inclusion complexes have been studied in aqueous solutions. It has been demonstrated that the γ-CD radicals are reducing species producing monoanion radicals, as well as doubly reduced , well characterised by their absorption spectra in the near IR. The oxidation potential of γ-CD radical is estimated to be more negative than −390 mV vs. NHE. The kinetics of the C60 reduction by γ-CDradicals have been determined and compared with kinetics by other reducing species including the solvated electron () and radicals. It was observed that the method of preparation of the 2:1 γ-CD/C60 inclusion complexes modifies the C60 reduction mechanism.

KW - 2:1 gamma-Cyclodextrin/[60]fullerene inclusion complexes

KW - Pulse radiolysis

KW - Oxidised gamma-cyclodextrin

KW - Fullerene reduction

KW - Reduction potentials

KW - C-60

KW - C-60(2)

KW - 9,10-Anthraquinone-2-sulfonate ion

U2 - 10.1016/j.chemphys.2008.10.014

DO - 10.1016/j.chemphys.2008.10.014

M3 - Article

SN - 0301-0104

VL - 354

SP - 174

EP - 179

JO - Chemical Physics

JF - Chemical Physics

IS - 1-3

ER -

Single and double reduction of C-60 in 2:1 gamma-cyclodextrin/[60]fullerene inclusion complexes by cyclodextrin radicals

Abstract

Keywords

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