Crystal structure of the complex K₄[W₂(CN)₁₀O₃]∙4H₂O

Chem. Met. Alloys 2 (2009) 25-29

https://doi.org/10.30970/cma2.0082

Iryna TYPILO, Olha SEREDA, Helen STOECKLI-EVANS, Dariya SEMENYSHYN,

Roman GLADYSHEVSKII

The complex K₄[W₂(CN)₁₀O₃]∙4H₂O was prepared by hydrolysis of K₄[W(CN)₈]∙2H₂O and its crystal structure solved by direct methods. Crystal data: C₁₀H₈K₄N₁₀O₇W₂, M_r = 904.34, triclinic system, space group P1, cell parameters a = 8.7910(8), b = 8.8424(8), c = 9.4743(9) Å, α = 82.316(11), β = 64.843(10), γ = 64.945(10)º, V = 602.92(10) Å³, Ζ = 1, D_X = 2.491 g cm^-3, R = 0.0236 and wR = 0.0584 for 2175 independent reflections. The coordination polyhedra of the tungsten(VI) atoms are pentagonal bipyramids W(CN)₅O₂, which are linked into pairs by sharing one of the oxygen atoms and twisted by 36º with respect to each other. The hydrogen bonds interconnect the pairs of pentagonal bipyramids into infinite complex chains. The coordination polyhedra of the two independent potassium atoms are trigonal prisms with one capped face (by a NC unit), but have different composition, K(1)(NC)₄O(OH₂)₂ and K(2)(NC)₅(OH₂)₂. The formula of this coordination compound can be written as K₄[OW(CN)₅OW(CN)₅O]·4H₂O.

W₂(CN)₁₀O₃ K(1)(NC)₄O(OH₂)₂ K(2)(NC)₅(OH₂)₂

Coordination polyhedra of the W and K atoms in K₄[W₂(CN)₁₀O₃]·4H₂O.

Keywords

Tungsten(VI) complex / Crystal structure / Coordination cyanide