Crystal structure of new iodacetatouranylates R[UO2(CH2ICOO)3]2∙2CH2ICOOH∙4H2O (R = Sr or Ba)

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Abstract

Synthesis, IR spectroscopic, and X-ray diffraction studies of R[UO2(mia)3]2·2Hmia·4H2O crystals, where R = Sr2+ (I) or Ba2+ (II), and mia is the monoiodoacetate ion CH2ICOO−, have been carried out. The [UO2(mia)3]– complexes correspond to the crystal chemical formula A(B01)3, where A = UO 22 +, B01 = mia. It has been established that a common feature of I and II is the presence of trinuclear electrically neutral clusters {R[UO2(mia)3]2(Hmia)2(H2O)2}. At the centers of the clusters there are trigonal RO8 dodecahedra; half of their oxygen atoms belong to four different mia anions of two [UO2(mia)3]– complexes. In addition, each R atom coordinates the oxygen atoms of two water molecules and the carbonyl oxygen atoms of two Hmia molecules. Using the method of molecular Voronoi–Dirichlet polyhedra, an analysis of noncovalent interactions in the structure of I was carried out.

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L. B. Serezhkina

Samara National Research University

Author for correspondence.
Email: lserezh@samsu.ru
Russian Federation, Samara 443011

M. S. Grigoriev

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: lserezh@samsu.ru
Russian Federation, Moscow, 119071

D. S. Mitinа

Samara National Research University

Email: lserezh@samsu.ru
Russian Federation, Samara 443011

V. N. Serezhkin

Samara National Research University

Email: lserezh@samsu.ru
Russian Federation, Samara 443011

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2. Fig. 1. Structure of the trinuclear cluster {Sr[UO2(mia)3]2 (Hmia)2(H2O)2}. To simplify the figure, the H atoms are not shown. For the right U(VI) atom in the cluster, the CP (hexagonal bipyramid) is shown, and for the left one, the corresponding VDP (hexagonal prism).

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3. Fig. 2. Structure of the trinuclear cluster {Ba[UO2(mia)3]2 (Hmia)2(H2O)2}. To simplify the figure, the H atoms are not shown. For the right U(VI) atom in the cluster, the CP (hexagonal bipyramid) is shown, and for the left one, the corresponding VDP (hexagonal prism).

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