Lithium, sodium and strontium fluoroglutaratouranylates: structure and some properties

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Using X-ray diffraction analysis, the structure of the crystals of Li(UO2)2(C5H6O4)2F⋅6H2O (I), NaUO2(C5H6O4)F⋅4H2O (II) and Sr(UO2)2(C5H6O4)2F2⋅8H2O (III) was studied for the first time. The uranium-containing structural units in crystals of I are 1D complexes [UO2(C5H6O4)F0.5(H2O)]0.5– with the crystal chemical formula AQ02M20.5M1, where A = UO22+, Q02 = C5H6O42–, M2= F–, M1 = H2O, and in II and III, 1D complexes of the same composition and structure [UO2(C5H6O4)F]– with the crystal chemical formula AQ02M2. In all compounds, the U(VI) atoms implement hexagonal-bipyramidal coordination, forming coordination polyhedra UO2FO5 (I) and UO2F2O4 (II and III). It was found that the long-characterized uranyl fluoroglutarate {UJUBEG}, for which the composition [UO2(С5H6O4)F]⋅2H2O was erroneously indicated, contradicting the principle of electrical neutrality, should be considered as (Н3O)[UO2(С5H6O4)F]⋅H2O.

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V. Serezhkin

Samara National Research University

编辑信件的主要联系方式.
Email: serezhkin@samsu.ru
俄罗斯联邦, Samara

М. Grigoriev

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

Email: serezhkin@samsu.ru
俄罗斯联邦, Moscow

М. Sukacheva

Samara National Research University

Email: serezhkin@samsu.ru
俄罗斯联邦, Samara

D. Pushkin

Samara National Research University

Email: serezhkin@samsu.ru
俄罗斯联邦, Samara

L. Serezhkina

Samara National Research University

Email: serezhkin@samsu.ru
俄罗斯联邦, Samara

参考

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2. Fig. 1. Dependence of the volume of VVDP of U(VI) atoms in the UObFc (I) and UObClc (II) complexes on λ, where λ = c/(b + c). The regression line for UObFc corresponds to equation (2). For UObClc, the data from [17] were used.

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3. Fig. 2. A fragment of the [UO2(C5H6O4)F0.5(H2O)]0.5– ribbon with the crystal chemical formula AQ02M20.5M1 in structure I. To simplify the figure, only the H atoms of water molecules are indicated. For the U atoms at the right end of the fragment, the projection of the CP — a hexagonal bipyramid (top) and the dual VDP — a hexagonal prism (bottom) are indicated.

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4. Fig. 3. A fragment of the [UO2(C5H6O4)F]– ribbon with the crystal chemical formula AQ02M2 in structure II or III. The H atoms of the glutarate ions are excluded to simplify the drawing. For the U atoms at the right end of the fragment, the projection of the CP – a hexagonal bipyramid (top) and the dual VDP – a hexagonal prism (bottom) is indicated.

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