Publication Date:
2016-12-18
Description:
Two new chromates of hexavalent uranium, [C 3 H 10 N][(UO 2 )(CrO 4 )(NO 3 )] ( 1 ) and [C 2 H 8 N] 2 [(UO 2 ) 2 · (CrO 4 ) 2 (Cr 2 O 7 )](H 2 O) 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) Å; 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) Å; 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 [(UO 2 )(CrO 4 )(NO 3 )] – chains between which the isopropylamine molecules are arranged. In the structure of 2 , the amine and H 2 O molecules are localized between the [(UO 2 ) 2 (CrO 4 ) 2 (Cr 2 O 7 )] 2– layers. The uranyl chromate complexes described are derived from [(UO 2 )(TO 4 )(H 2 O) n ] 0 chains (T = Cr 6+ , S 6+ , Se6+, n = 0–2). A brief review of uranyl compounds with tetrahedral TO 4 2– anions (T = Cr 6+ , S 6+ , Se 6+ ) and similar structural organization is given.
Print ISSN:
1066-3622
Electronic ISSN:
1608-3288
Topics:
Chemistry and Pharmacology
