TY - JOUR

T1 - K2Na8(UO2)8Mo4O 24[(S,Mo)O4], the first uranium molybdosulfate

T2 - Synthesis, crystal structure, and comparison to related compounds

AU - Krivovichev, Sergey V.

PY - 2014

Y1 - 2014

N2 - Orange platy crystals of K2Na8(UO2) 8Mo4O24[(S,Mo)O4], the first known uranium molybdosulfate, have been prepared by high-temperature solid-state reactions. The structure (monoclinic, C2/c, a = 24.282(4), b = 12.1170(18), c = 13.6174(17) Å, β = 106.33(1)°, V = 3845.0(9) Å3, Z = 4) has been solved by direct methods and refined to R1 = 0.058 on the basis of 2837 unique observed reflections. The structure consists of a three-dimensional heteropolyhedral framework based upon the [(UO2)4O 4(Mo2O10)] layers parallel to (010). The layers are formed by linkage of chains of edge-sharing UO7 bipyramids running along the c axis via the Mo2O10 dimers of edge-sharing MoO6 octahedra. Linkage of the layers into a three-dimensional framework is provided by the MoO4 and SO 4 tetrahedra that share corners with the MoO6 octahedra. The Na + and K+ cations reside in framework cavities in between the uranyl molybdate layers. The structure of K2Na 8(UO2)8Mo4O24[(S,Mo)O4] is yet another complex derivative of the U2MoO8 structure type.

AB - Orange platy crystals of K2Na8(UO2) 8Mo4O24[(S,Mo)O4], the first known uranium molybdosulfate, have been prepared by high-temperature solid-state reactions. The structure (monoclinic, C2/c, a = 24.282(4), b = 12.1170(18), c = 13.6174(17) Å, β = 106.33(1)°, V = 3845.0(9) Å3, Z = 4) has been solved by direct methods and refined to R1 = 0.058 on the basis of 2837 unique observed reflections. The structure consists of a three-dimensional heteropolyhedral framework based upon the [(UO2)4O 4(Mo2O10)] layers parallel to (010). The layers are formed by linkage of chains of edge-sharing UO7 bipyramids running along the c axis via the Mo2O10 dimers of edge-sharing MoO6 octahedra. Linkage of the layers into a three-dimensional framework is provided by the MoO4 and SO 4 tetrahedra that share corners with the MoO6 octahedra. The Na + and K+ cations reside in framework cavities in between the uranyl molybdate layers. The structure of K2Na 8(UO2)8Mo4O24[(S,Mo)O4] is yet another complex derivative of the U2MoO8 structure type.

KW - Crystal structure

KW - Molybdosulfate

KW - New compound

KW - Uranium

UR - http://www.scopus.com/inward/record.url?scp=84973922959&partnerID=8YFLogxK

U2 - 10.3190/jgeosci.166

DO - 10.3190/jgeosci.166

M3 - Article

AN - SCOPUS:84973922959

VL - 59

SP - 115

EP - 121

JO - Journal of Geosciences

JF - Journal of Geosciences

SN - 1802-6222

IS - 2

ER -