Bucky (basket)ball. Stabilization of electrogenerated C[sub 60]- radical monoanion in water by means of cyclodextrin inclusion chemistry

Journal Article · Thu Jan 27 04:00:00 EST 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100055a039· OSTI ID:5146758

Boulas, P; Kutner, W; Jones, M T; Kadish, K M ^[1]

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1. Univ. of Houston, TX (United States)

A water-soluble magenta [gamma]-cyclodextrin inclusion complex of C[sub 60] ([gamma]-CD/C[sub 60]) was prepared by a mild method which involved solubilizing C[sub 60] in carbon disulfide followed by extracting C[sub 60] with a [gamma]-CD aqueous ethanolic solution. The UV-visible spectroscopy of [gamma]-CD/C[sub 60] and spectroelectrochemistry of the electrogenerated [gamma]-CD/C[sub 60][sup [minus]] radical monoanion in water resemble those of C[sub 60] in n-hexane and C[sub 60][sup [minus]] in dichloromethane, respectively, indicating that the electronic properties of the C[sub 60] and C[sub 60][sup [minus]] guests are practically unaffected by molecular inclusion. The FT-IR spectrum of solid [gamma]-CD/C[sub 60] is only slightly different from that of [gamma]-CD. Cyclic voltammetry of the [gamma]-CD/C[sub 60] complex in aqueous 0.15 M LiClO[sub 4] solution shows three one-electron electroreductions of which only the first two, of E[sub 1/2] values equal to [minus]0.57 and [minus]1.03 V vs SCE, are reversible. The ESR spectrum in a frozen 0.2 M LiClO[sub 4] aqueous solution of electrogenerated [gamma]-CD/C[sub 60][sup [minus]] is similar to that of C[sub 60][sup [minus]] in aprotic solvents. The ESR line shape and linewidth are dependent upon the temperature with an activation energy, E[sub a] = 0.043 eV, while the g value, equal to 1.998, is temperature independent over the 77-220 K range. 54 refs., 7 figs.

• OSTI ID: 5146758
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:4; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400400 -- Electrochemistry
ACTIVATION ENERGY
ANIONS
AQUEOUS SOLUTIONS
CARBOHYDRATES
CARBON
CHARGED PARTICLES
CHEMICAL REACTIONS
CHEMISTRY
CLATHRATES
DISPERSIONS
ELECTROCHEMISTRY
ELECTRON SPIN RESONANCE
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY
EXTRACTION
FOURIER TRANSFORM SPECTROMETERS
FULLERENES
INFRARED SPECTRA
IONIZATION
IONS
MAGNETIC RESONANCE
MEASURING INSTRUMENTS
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
POLYSACCHARIDES
RADICALS
REDUCTION
RESONANCE
SACCHARIDES
SEPARATION PROCESSES
SOLUBILITY
SOLUTIONS
SPECTRA
SPECTROMETERS
STABILITY
STABILIZATION
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA
VOLTAMETRY