TY - JOUR

T1 - Specific Features of the Crystal Chemistry of Layered Uranyl Compounds with the Ratio UO2 : TO4 = 5 : 8 (T = S6+, Cr6+, Se6+, Mo6+)

AU - Nazarchuk, E.V.

AU - Siidra, O.I.

AU - Charkin, D.O.

PY - 2018/7/1

Y1 - 2018/7/1

N2 - Two new U(VI) compounds templated with organic molecules, [(CH 6N) 3(H 2O)][(CH 6N) 2(C 3H 10N)· (H 2O)][(UO 2) 5(CrO 4) 8(H 2O)] (1) and [(C 6H 10N 3O 3)(H 5O 2) 2(H 2O)][(H 5O 2) 3(H 2O)][(UO 2) 5(SO 4) 8(H 2O)] (2), were prepared by combination of hydrothermal synthesis and isothermal evaporation methods. Compounds 1 and 2 crystallize in the monoclinic system, space group P2 1/n, a = 21.921(5), b = 11.016(2), c = 22.021(5) Å, β = 90.571(5)° for 1 and P 2/c, a = 18.1693(17), b = 10.0732(10), c = 30.098(3) Å, β = 103.427(2)° for 2. The reflections from the single crystals were collected at 100 K. The structures were solved by the direct methods and refined to R 1 = 0.053 and 0.070 for 1 and 2, respectively. The crystal structures of 1 and 2 are based on [(UO 2) 5(TO 4) 8(H 2O)] 6– modular layers (T = S 6+, Cr 6+) between which protonated organic molecules, water molecules, and hydroxonium ions are located. Specific features of the crystal chemistry of U(VI) compounds with tetrahedral oxoanions with the ratio UO 2: TO 4 = 5: 8 (T = S 6+, Cr 6+, Se 6+, Mo 6+) are considered.

AB - Two new U(VI) compounds templated with organic molecules, [(CH 6N) 3(H 2O)][(CH 6N) 2(C 3H 10N)· (H 2O)][(UO 2) 5(CrO 4) 8(H 2O)] (1) and [(C 6H 10N 3O 3)(H 5O 2) 2(H 2O)][(H 5O 2) 3(H 2O)][(UO 2) 5(SO 4) 8(H 2O)] (2), were prepared by combination of hydrothermal synthesis and isothermal evaporation methods. Compounds 1 and 2 crystallize in the monoclinic system, space group P2 1/n, a = 21.921(5), b = 11.016(2), c = 22.021(5) Å, β = 90.571(5)° for 1 and P 2/c, a = 18.1693(17), b = 10.0732(10), c = 30.098(3) Å, β = 103.427(2)° for 2. The reflections from the single crystals were collected at 100 K. The structures were solved by the direct methods and refined to R 1 = 0.053 and 0.070 for 1 and 2, respectively. The crystal structures of 1 and 2 are based on [(UO 2) 5(TO 4) 8(H 2O)] 6– modular layers (T = S 6+, Cr 6+) between which protonated organic molecules, water molecules, and hydroxonium ions are located. Specific features of the crystal chemistry of U(VI) compounds with tetrahedral oxoanions with the ratio UO 2: TO 4 = 5: 8 (T = S 6+, Cr 6+, Se 6+, Mo 6+) are considered.

KW - X-ray diffraction analysis

KW - complex compounds

KW - uranium(VI)

UR - http://www.scopus.com/inward/record.url?scp=85052078225&partnerID=8YFLogxK

U2 - 10.1134/S1066362218040033

DO - 10.1134/S1066362218040033

M3 - Article

VL - 60

SP - 352

EP - 361

JO - Radiochemistry

JF - Radiochemistry

SN - 1066-3622

IS - 4

ER -