An improved method for the synthesis of [ZnW12O40]6– and its reaction with [Pt(OH)4(H2O)2]: Crystal structures of (H2NMe2)5H[ZnW12O40] · 3.5H2O and K6Na2[PtW6O24] · 11H2O

Аннотация

(Me₂NH₂)₅H[ZnW₁₂O₄₀] · 3.5H₂O (I) has been synthesized by the reaction between Zn(NO₃)₂ · 4H₂O, Na₂WO₄ · 2H₂O and (Me₂NH₂)NO₃ under hydrothermal conditions with a yield of 79%. The crystal structure of complex I has been characterized by single-crystal X-ray diffraction. Crystals of complex I are monoclinic, space group Cc, a = 13.165(1) Å, b = 19.370(1) Å, c = 20.987(2) Å, α = 84.81°, V = 5145.9(0) ų, Z = 4, C₁₀H₄₈N₅O_43.5ZnW₁₂. The Zn–O and W–O bond lengths are 1.86(2)–1.89(3) and 1.697(1)–2.030(2) Å, respectively. Na₂K₆[PtW₆O₂₄] · 11H₂O (II) has been synthesized by a slow reaction between (Me₂NH₂)₅H[ZnW₁₂O₄₀] · 3.5H₂O and [Pt(OH)₄(H₂O)₂] in H₂O at room temperature. Crystals of complex II are trigonal, space group R\(\bar 3\)m, a = 13.138(1) Å, c = 20.987(2) Å, V = 2742.9(1) ų, Z = 3, H₂₂O₃₅Na₂K₆PtW₆. The crystal structure of complex II contains [PtW₆O₂₄]^6– anions linked to K⁺ cations via oxygen atoms. The Na⁺ cation is coordinated to water molecules. The Pt atom is in a standard octahedral surrounding (Pt–O and W–O are 2.018(6) and 1.762(5)–2.151(4) Å, respectively).