ISSN 1070-4272, Russian Journal of Applied Chemistry, 2016, Vol. 89, No. 9, pp. 1409−1413. © Pleiades Publishing, Ltd., 2016.
Original Russian Text © Zh.V. Faustova, Yu.G. Slizhov,
2016, published in Zhurnal Prikladnoi Khimii, 2016, Vol. 89, No. 9, pp. 1115−1120.
INORGANIC SYNTHESIS AND INDUSTRIAL
Development of new chromatographic materials dis-
tinguished by improved structural-sorption and analytical
characteristics is one of the advancement lines of gas
chromatography as a method for qualitative and quanti-
tative analyses of objects of natural and anthropogenic
origin. Of particular interest in this case are chromato-
graphic materials modiﬁ ed with β-dicarbonyl compounds
making it possible to widely vary the physicochemical
and chromatographic properties of sorbents . Despite
the existence of a large number of reports concerned
with the development and application of various kinds of
adsorbents, ﬁ xed liquid phases, and analytical columns
containing β-dicarbonyl complexes, the properties of
sorbents modiﬁ ed with benzoyl acetonates of rare-earth
elements (REEs) have not been studied, which makes
topical the fabrication of these chelate-containing chro-
matographic materials and examination of their texture
and chromatographic properties.
The large ionic radii of REEs and the distinctive
features of their complexing capacity, namely the
predominantly ionic type of bonding and large variable
coordination numbers, are clearly manifested in the
chemistry of β-diketonates of these elements [2, 3].
A CN = 8 is characteristic of Eu and Ce β-diketonates,
and their coordination conﬁ guration is a square antiprism
. Complexes of this structure are hardly applied in
gas chromatography, and, consequently, their use is of
particular scientiﬁ c interest.
The goal of our study was to obtain cerium and euro-
pium benzoyl acetonates, analyze their physicochemical
and structural characteristics, examine the gas-chro-
matographic properties of sorbents for the example of a
mesoporous silica gel modiﬁ ed with chelate complexes
(Ba stands for benzoyl acetone),
and determine how the nature of a modifying complex
affects the chromatographic and sorption properties of
the materials obtained.
The benzoyl acetonates were synthesized by the
following procedure: 2 g of an REE salt was dissolved in
Synthesis and Study of the Composition and Properties
of Chelate Complexes of Benzoyl Acetonates of Rare-Earth
Elements and Use of These in Gas Chromatography
Zh. V. Faustova and Yu. G. Slizhov
National Research Tomsk State University, pr. Lenina 36, Tomsk, 634050 Russia
Received September 2, 2016
Abstract—Chelate complex cerium [Ce(BA)
)] and europium [Eu(BA)
] benzoyl acetonates were synthesized.
According to IR spectroscopic data and elemental analyses, the composition of the complexes is described by
the empirical formulas M(BA)
O. Sorbents based on a mesoporous silica gel modiﬁ ed with cerium and
europium benzoyl acetonates were obtained. The nitrogen porosimetry demonstrated that, as the complexes are
deposited onto the surface of the starting support, the speciﬁ c surface area and the pore volume become smaller.
The polarity of the sorbents Chromaton N-AW + SiO
with respect to all classes of test compounds
decreases in the order Ce
. According to the data obtained for the capacity factors, the sorbent modiﬁ ed
with cerium benzoyl acetonate selectively separates alcohols, and Chromaton N-AW + SiO
with deposited che-
shows the best separating capacity for alkanes and alcohols. It was shown that the sorbents can be
used in practice for separating gaseous mixtures of light hydrocarbons.