Crystal Structure of Potassium Dysprosium Octacyanotungstate(IV) Heptahydrate

摘要

The crystal structure of KDyW(CN)8·7H2O was determined by X-ray diffraction. The crystals are triclinic, space group PI, a=7.6284(7) A, b=9.2435(9) A, c=14.4778(14) A, α=80.673(11)°, β= 87.561(11)°, γ= 77.603(11)°, V=983.86(16) A~3, Z=2, ρ_(calcd)=2.429 g/cm~3, R=0.0249, w_R=0.0502 for 3601 independent reflections. The coordination polyhedron of tungsten is a highly deformed tetragonal anti-prism [W(CN)8], that of dysprosium is a tetragonal antiprism [DyN4(H2O)4]. Some cyano groups are bridging being coordinated to tungsten and dysprosium by C and N atoms, respectively, and form a 3D structure via potassium atoms. The coordination polymer can be described as {[K(H2O)][Dy(H2O)4][W(CN)8]}_n·2nH2O.