ISSN 1070-4272, Russian Journal of Applied Chemistry, 2008, Vol. 81, No. 12, pp. 2127–2131. © Pleiades Publishing, Ltd., 2008.
Original Russian Text © Yu.A. Gorbatenko, Z.G. Rezinskikh, G.N. Lipunova, I.G. Pervova, T.I. Maslakova, P.A. Slepukhin, I N. Lipunov, 2008, published in
Zhurnal Prikladnoi Khimii, 2008, Vol. 81, No. 12, pp. 2016–2020.
Synthesis and Spectroscopic Features of Iron(II)
Yu. A. Gorbatenko, Z. G. Rezinskikh, G. N. Lipunova, I. G. Pervova,
T. I. Maslakova, P. A. Slepukhin, and I. N. Lipunov
Ural State University of Forestry Engineering, Yekaterinburg, Russia
Ural State Technical University–Ural Polytechnic Institute, Yekaterinburg, Russia
Postovskii Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
Received June 18, 2008
Abstract—New iron(II) coordination compounds with 1-aryl-5-(benzothiazol-2-yl)formazans were prepared.
Their compositions and structures were determined by electronic spectroscopy, mass spectrometry, single
crystal X-ray diffraction analysis, and magnetochemical measurements.
Iron coordination compounds with polydentate
nitrogen-containing heterocyclic ligands are unique
chemical systems. The specific features of their prop-
erties and structure are determined by the nature of the
coordination core and by the steric arrangement of side
Iron chelates has demonstrated good performance
as effective catalysts of not only industrial (synthesis
of ammonia, dehydrogenation of hydrocarbons, etc.)
[1–3] but also biochemical processes . Many of these
compounds are characterized by exchange interactions
of both ferro- (ferri-) and antiferromagnetic type, which
lead under the action of certain external factors (tem-
perature, pressure, irradiation at a definite wavelength) to
transitions into a magnetically ordered state or to spin
transitions S = 5/2 ҙ S = 1/2 [5–7] and make the iron
complexes attractive objects for molecular electronics. In
this context, synthesis and study of structural features of
new coordination compounds of iron with ambidentate
ligands are of both scientific and practical interest.
Among such ligands are, in particular, hetarylfor-
mazans, for which both bridging and chelate coordina-
tion is typical. The polydenticity and high flexibility of
the formazan molecule, as well as the ability of such
compounds to act as both bi-, tri-, and tetradentate
ligands and also the possibility of controlling their
properties through the substituent effect make them
attractive for design of organometallic complexes with
required stereochemistry [8, 9].
This study is concerned with synthesis of iron co-
ordination compounds with formazans I–V and with
the substituent effect on the composition, structure,
and spin state of the metal complexes.
AND INDUSTRIAL ORGANIC CHEMISTRY
The compounds were prepared from FeCl
of analytically pure grade. 1-Aryl-5-benzothiazol-2-yl-
formazans were synthesized by the procedures de-
scribed in [10–13]. The purity of the metal complexes
was verified by TLC on Silufol UV-254 plates.
yl)formazanate (IFe). A solution of 0.3 mmol of iron
(III) chloride in 15 ml of water was added dropwise
with continuous stirring at 40
5°C to a solution of
0.9 mmol of formazan in 100 ml of aqueous ethanol
1). The resulting mixture was stirred for 30 min
and evaporated to a volume of 10 ml. The precipitate