A. V. Rotov, E. A. Ugolkova, N. N. Efimov, A. G. Beyrakhov, and V. V. Minin
Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Science,
Leninskii pr. 31, Moscow, 119991 Russia
e-mail: rotov@igic.ras.ru
Received May 7, 2015
Abstract—Compounds CuL2, where L = R1N(O)–(O)CR2, R1 = C6H5, R2 = C6H5 (I); R1 = C6H5, R2 = CH3 (II);
or R1 = 2,4,6-(CH3)3C6H2, R2 =CH3 (III) have been structurally studied by electron paramagnetic resonance
(EPR) in methylene chloride. Spectra of two forms of the compounds, which according to the EPR data are
mononuclear, are observed in all solutions at room temperature. In frozen solutions of complexes I and II, spec-
tra of monomeric and dimeric forms of the complex are recorded; in a frozen solution of III, spectra of two
monomeric forms of the complex. The absence of dimers in the frozen solution of III is explained by the pres-
ence of steric hindrances for the rapprochement of monomeric complexes. Relative concentrations of the forms
and their magnetic resonance parameters have been determined using mathematical modeling of the shape of
the EPR line.
DOI: 10.1134/S0036023615120207
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