Synthesis and crystal-chemical features of two new uranyl chromates with the structures derived from [(UO2)(T6+O4)(H2O) n ]0 (T = Cr6+, S6+, Se6+, n = 0–2)
| Autor: | Oleg I. Siidra, Roman A. Kayukov, Evgeny V. Nazarchuk |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Chromate conversion coating
Crystal structure Triclinic crystal system 010402 general chemistry 010403 inorganic & nuclear chemistry Uranyl 01 natural sciences 0104 chemical sciences Crystal Crystallography chemistry.chemical_compound chemistry Hydrothermal synthesis Molecule Isopropylamine Physical and Theoretical Chemistry |
| Zdroj: | Radiochemistry. 58:571-577 |
| ISSN: | 1608-3288 1066-3622 |
| Popis: | Two new chromates of hexavalent uranium, [C3H10N][(UO2)(CrO4)(NO3)] (1) and [C2H8N]2[(UO2)2· (CrO4)2(Cr2O7)](H2O)2 (2), were prepared by a combination of hydrothermal synthesis and isothermal evaporation. Compounds 1 and 2 crystallize in the triclinic system, space group $$P\overline 1 $$ ; a = 7.245(3), b = 7.329(3), c = 11.359(4) A; α = 85.549(6)°, β = 82.547(6)°, γ = 80.174(6)° for 1; a = 7.2063(4), b = 11.5107(7), c = 16.0980(11) A; α = 70.736(4)°, β = 80.246(4)°, γ = 71.759(4)° for 2. The structures were solved by the direct methods and refined to R 1 = 0.064 [for 1495 reflections with Fo > 4σ(Fo)] and 0.047 [for 4529 reflections with Fo > 4σ(Fo)] for 1 and 2, respectively. The crystal structure of 1 is based on [(UO2)(CrO4)(NO3)]– chains between which the isopropylamine molecules are arranged. In the structure of 2, the amine and H2O molecules are localized between the [(UO2)2(CrO4)2(Cr2O7)]2– layers. The uranyl chromate complexes described are derived from [(UO2)(TO4)(H2O) n ]0 chains (T = Cr6+, S6+, Se6+, n = 0–2). A brief review of uranyl compounds with tetrahedral TO 4 2– anions (T = Cr6+, S6+, Se6+) and similar structural organization is given. |
| Databáze: | OpenAIRE |
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