Pulse radiolysis studies on the redox reactions of aqueous solutions of [gamma]-cyclodextrine/C[sub 60] complexes

Journal Article · Thu Sep 22 04:00:00 EDT 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100089a033· OSTI ID:7070983

Priyadarsini, K I; Mohan, H; Mittal, J P ^[1]; Guldi, D M; Asmus, K D ^[2]

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1. Bhabha Atomic Research Centre, Trombay (India)
2. Hahn-Meitner-Institut Berlin GmbH (Germany)

Pulse radiolytical studies on the water-soluble [gamma]-cyclodextrine/C[sub 60] ([gamma]-CD/C[sub 60]) complex with primary radiolytic species, such as [sup [sm bullet]]OH, [sup [sm bullet]]H, and e[sub aq][sup [minus]] have been carried out in aqueous solution. Rare constant for the formation of the transient products are determined by following the build-up kinetics of the species at the respective absorption maxima and the bleaching of the ground state C[sub 60] at 330 nm. [sup [sm bullet]]OH- and [sup [sm bullet]]H-induced reactions lead to a transient with [lambda][sub max] at 290 nm showing identical formation kinetics as the concurrent bleaching at 330-335 nm. Studies on [gamma]-CD/C[sub 60] complexes and uncomplexed [gamma]-CD indicated that [sup [sm bullet]]OH is mainly reacting with the host ([gamma]-CD) by hydrogen abstraction (employing competition kinetics with KSCN as reference standard). The resulting radical subsequently reacts with C[sub 60] to yield a radical adduct which absorbs at 290 nm. Reaction of the Cl[sub 2][sup [minus]] with [gamma]-CD/C[sub 60] produces a transient species that shows a broad absorption maximum at 380-430 nm. This species is assigned to be the radical adduct (C[sub 60]Cl)[sup [sm bullet]]. 27 refs., 5 figs.

• OSTI ID: 7070983
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:38; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
400600 -- Radiation Chemistry
ABSORPTION SPECTROSCOPY
ANIONS
AQUEOUS SOLUTIONS
CARBON
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DECOMPOSITION
DISPERSIONS
ELEMENTS
FULLERENES
IONS
KINETICS
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REACTION KINETICS
REDOX REACTIONS
SOLUTIONS
SPECTROSCOPY