Effect of solution acidity on the crystallization of polychromates in uranyl-bearing systems: Synthesis and crystal structures of Rb2[(UO2)(Cr2O7)(NO3)2] and two new polymorphs of Rb2Cr3O10

Evgeny V. Nazarchuk, Oleg I. Siidra, Dmitry O. Charkin, Stepan N. Kalmykov, Elena L. Kotova

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

Three new rubidium polychromates, Rb2[(UO2) (Cr2O7)(NO3)2] (1), γ-Rb2Cr3O10 (2) and δ-Rb2Cr3O10 (3) were prepared by combination of hydrothermal treatment at 220 °C and evaporation of aqueous solutions under ambient conditions. Compound 1 is monoclinic, P21/c, a = 13.6542(19), b = 19.698(3), c = 11.6984(17) Å, β = 114.326(2)°, V = 2867.0(7) Å3, R1 = 0.040; 2 is hexagonal, P63/m, a = 11.991(2), c = 12.828(3) Å, γ = 120°, V = 1597.3(5) Å3, R1 = 0.031; 3 is monoclinic, P21/n, a = 7.446(3), b = 18.194(6), c = 7.848(3) Å, β = 99.953(9)°, V = 1047.3(7) Å3, R1 = 0.037. In the crystal structure of 1, UO8 bipyramids and NO3 groups share edges to form [(UO2)(NO3)2] species which share common corners with dichromate Cr2O7 groups producing novel type of uranyl dichromate chains [(UO2)(Cr2O7)(NO3)2]2−. In the structures of new Rb2Cr3O10 polymorphs, CrO4 tetrahedra share vertices to form Cr3O102− species. The trichromate groups are aligned along the 63 screw axis forming channels running in the ab plane in the structure of 2. The Rb cations reside between the channels and in their centers completing the structure. The trichromate anions are linked by the Rb+ cations into a 3D framework in the structure of 3. Effect of solution acidity on the crystallization of polychromates in uranyl-bearing systems is discussed.

Язык оригиналаанглийский
Страницы (с-по)11-21
Число страниц11
ЖурналZeitschrift fur Kristallographie - Crystalline Materials
Том236
Номер выпуска1
DOI
СостояниеОпубликовано - 1 фев 2021

Предметные области Scopus

  • Материаловедение (все)
  • Физика конденсатов
  • Неорганическая химия

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Подробные сведения о темах исследования «Effect of solution acidity on the crystallization of polychromates in uranyl-bearing systems: Synthesis and crystal structures of Rb<sub>2</sub>[(UO<sub>2</sub>)(Cr<sub>2</sub>O<sub>7</sub>)(NO<sub>3</sub>)<sub>2</sub>] and two new polymorphs of Rb<sub>2</sub>Cr<sub>3</sub>O<sub>10</sub>». Вместе они формируют уникальный семантический отпечаток (fingerprint).

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