ISSN 1070-3632, Russian Journal of General Chemistry, 2008, Vol. 78, No. 11, p. 2166. © Pleiades Publishing, Ltd., 2008.
Original Russian Text © V.I. Zelenov, I.V. Shabanova, M.N. Tsokur, 2008, published in Zhurnal Obshchei Khimii, 2008, Vol. 78, No. 11, p. 1930.
LETTERS
TO THE EDITOR
Electrochemical Synthesis of Copper(II) Benzoate
V. I. Zelenov, I. V. Shabanova, and M. N. Tsokur
Kuban State University,
ul. Stavropol’skaya, 149, Krasnodar, 350040 Russia
e-mail: science@kubsu.ru
Received October 8, 2007
DOI: 10.1134/S1070363208110352
A few works has been published so far on the
electrochemical synthesis of benzoic acid derivatives.
Taking into account the promising character of this
method [1] we undertook efforts to carry out
electrochemical synthesis of copper(II) benzoate.
the second case С 54.48; Н 3.36; Сu 20.78. For
Сu(С6Н5СОО)2 calculated, %: С 54.99; Н 3.27; Сu
20.78. IR spectra of the synthesized substances are
identical and changes relative to the spectrum of
benzoic acid are characteristic enough. The band of
asymmetric stretching vibrations of the ligand at
1701 cm–1 disappears and two bands appear, at 1533
and 1596 cm–1 in the sample obtained with direct
current and 1536, 1598 cm–1 in the case of pulse
current.
The synthesis was carried out in a two-electrode
cell with copper electrodes. The installation scheme we
described in [2]. As initial compounds we used
benzoic acid of “analytically pure” grade, the material
for the electrodes was copper of М00 sort. Ethanol
(GOST 18300-87) was used as a solvent. Initial anode
current density was 6 mA cm–2. 30 min later we ob-
served turbidity and inensive formation of precipitate,
then current density decreased, and the process prac-
tically ceased due to the formatioen of a dense film on
the electrode surface, so the latter needed mechanical
cleaning. To avoid these negative effects we applied
pulse current with alternating polarity. This gave effect
of the electrodes self-claning that allowed us to
perform the synthesis in continuous mode till complete
reagent consumption. The precipitate obtained was
separated by filtration, washed with 10-fold amount of
ethyl alcohol, and dried to constant weight.
The IR spectra were registered on a Specord 71 IR
spectrophotometer, the cell window made of sodium
chloride, the samples were prepared as suspensions in
mineral oil.
ACKNOWLEDGMENTS
This work was financially supported by the Russian
Foundation for Basic Research, grant no. 06-03-96603.
REFERENCES
1. Kukushkin, V.Yu. and Kukushkin, Yu.N., Teoriya i
praktika sinteza koordinatsionnykh soedinenii (Theory
and Practice of the Synthesis of Coordination Com-
pounds), Leningrad: Nauka, 1994.
2. Zelenov, V.I., Il’chenko, G.P., Katkov, A.E., Storo-
zhenko, T.P., Tsokur, M.N., and Chernova, A.V., RF
Patent 2281935, Byul. Izobret., 2006, no. 23.
According to the analysis data, the composition of
the products obtained with direct current and with
pulse current is the same. For Сu(С6Н5СОО)2 in the
first case is found, %: С 54.65; Н 3.14; Сu 20.77; in
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Zelenov
