Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 7, pp. 1165−1169.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © V.G. Isakova, E.A. Goncharova, O.A. Bayukov, G.N. Churilov, 2011, published in Zhurnal Prikladnoi Khimii, 2011, Vol. 84, No. 7,
OF SYSTEMS AND PROCESSES
Hydroxylation of Fullerenes Modiﬁ ed
with Iron Nanoparticles
V. G. Isakova
, E. A. Goncharova
, O. A. Bayukov
, and G. N. Churilov
Kirenskii Institute of Physics, Russian Academy of Sciences, Siberian Division, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia
Received September 15, 2010
Abstract—The possibility was explored for synthesizing polyhydroxylated fullerenes directly from soot containing
iron nanoparticles stabilized by carbon shell.
Synthesis of fullerenes in plasma at atmospheric pres-
sure [1, 2] allows easy variation of the process parameters,
which opens wide prospects for introducing various dop-
ing substances into the fullerene-forming carbon plasma.
When introduced into a high-energy plasma process,
metal powders disperse to nanometer-sized particles.
The synthesis process may lead to formation, in addition
to fullerenes, of metal core–carbon shell nanostructures
[2, 3] which are of interest in applied and basic research.
However, the products of graphite and metal powder co-
evaporation comprise, along with metal-containing par-
ticles and fullerenes, signiﬁ cant (up to 90%) amounts of
ultradispersed carbon. This generates the need to separate
fractions possessing a functional value from impurities.
When the extraction technique is used for this purpose,
fullerenes pass into an organic solvent solution, and the
bulk of the metal remains in the solid residue.
Previously, we reported on low-temperature cata-
lytic combustion of ultradispersed graphite impurities
in platinized fullerene-containing soots and on the use
of the resulting material in synthesis of water-soluble
fullerene derivatives . The combustion was initiated
by exothermic decomposition of platinum(II) acetylace-
tonate, catalyzed by fullerenes. It was shown previously
[5, 6] that a mixture of C
with iron(III) acetylacetonate
spontaneously ignites at 160–200°C; the combustion
proceeds without any appreciable increase in temperature
and, hence, without burnout of the fullerene.
Here, we examined the products yielded by heating
fullerene-containing soot, comprising nanodispersed iron,
with an iron acetylacetonate addition. The resulting solid-
phase products were treated with liquid-phase oxidants.
The water-soluble iron-containing fullerene derivative
thereby produced were examined as well.
Iron-metallized fullerene-containing soot (Fe/FS) was
prepared by the plasmochemical route at atmospheric
pressure in a plasma reactor [1, 2]. For arc spraying of
iron powder the arc was fed by a high-frequency (44-
kHz) alternating current generated between two graphite
The content of C
in Fe/FS was 5–6%, and
those of iron and ultradispersed carbon associated with
fullerenes, 5 and 90%, respectively.
The Fe/FS soot with an iron acetylacetonate [Fe(acac)
addition  was heated in air. A black powder resulted
from low-temperature catalytic smoldering combustion
(160–200°C) was boiled in a hydrochloric acid solu-
tion. As dissolution of iron progressed, the residue was
separated and treated with fresh portions of acid. The
solid residue was thoroughly rinsed with water. The iron
content in the resulting product (sample I) was 1.4%.
Sample I was boiled with concentrated nitric acid for
3 h, which caused its gradual dissolution with formation