Gadolinium(III) Complexation with Modified
Polymers according to ESR Data

A. V. Mikhailova^a, V. P. Dedkova^a, O. P. Shvoeva^a, Ya. I. Shcherbakova^a, N. N. Efimov^b,
E. A. Ugolkova^b, A. A. Grechnikov^a, S. B. Savvin^a, and V. V. Minin^b

^a Vernadskii Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences,
ul. Kosygina 19, Moscow, 117977 Russia

^b Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 117907 Russia

e-mail: minin@igic.ras.ru

Received June 16, 2014

Abstract—Gadolinium(III) sorption and complexation with azo reagents (ORs) derived from chromotropic
acid at pH 5 and ratio Gd(III) : OR = 1 : 1 was studied by ESR spectrometry. Solid phase used is polymeric fine-
fibered materials filled with highly dispersed AV-17 anion-exchange resin. In the used systems, reagents con-
taining o-sulfo-o'-hydroxyazo group show maximal complexing ability; Gd(III) sorption as a complex with OR
formed in solution is considerably larger than metal sorption on a polymer with immobilized reagent. The fea-
tures of ESR spectrum of Gd(III) ion with low-symmetry environment are discussed.

DOI: 10.1134/S0036023614120183

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