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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 Rb2Cr3O10статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 8 апреля 2021 г.
- Авторы: Nazarchuk Evgeny V., Siidra Oleg I., Charkin Dmitry O., Kalmykov Stepan N., Kotova Elena L.
- Журнал: Zeitschrift für Kristallographie – Crystalline Materials
- Том: 236
- Номер: 1-2
- Год издания: 2021
- Издательство: Walter de Gruyter
- Местоположение издательства: Berlin, Germany
- Первая страница: 11
- Последняя страница: 21
- DOI: 10.1515/zkri-2020-0078
- 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)º, V = 2867.0(7) Å3, R1 = 0.039; 2 is hexagonal, P63/m, a = 11.991(2), c = 12.828(3) Å, γ = 120º, V = 1597.3(5) Å3, R1 = 0.030; 3 is monoclinic, P21/n, a = 7.446(3), b = 18.194(6), c = 7.848(3) Å, β = 99.953(9)º, 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 vertices 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.
- Добавил в систему: Чаркин Дмитрий Олегович