Synthesis, characterization and crystal structures of three new inorganic dinuclear diperoxo complexes of W(VI) and Mo(VI); Rb2{O[WO(O2)2H2O]2}·H2O, Rb2{O[MoO(O2)2H2O]2}·H2O and Cs2{O[MoO(O2)2]2}

The crystal structures of three dinuclear diperoxo compounds have been determined from single-crystal X-ray (two compounds) and powder diffraction data (one compound). All the compounds crystallize in the triclinic space group P-1(2). (1) Rb2{O[WO(O2)2H2O]2}·H2O crystallizes with a = 6.329(5), b = 8.107(5), c = 12.405(5) Å, α = 105.526(5), β = 92.389(5), γ = 104.923(5)°, Z = 2. (2) Rb2{O[MoO(O2)2H2O]2}·H2O crystallizes with a = 6.275(5), b = 8.120(5), c = 12.472(5) Å, α = 105.416(5), β = 92.038(5), γ = 105.289(5)°, Z = 2. (3) Cs2{O[MoO(O2)2]2} crystallizes with a = 7.767(5), b = 8.738(5), c = 8.884(5) Å, α = 64.847(5), β = 68.212(5), γ = 81.475(5)°, Z = 2. The results of crystal structure determination and of IR, TG/DSC and analytical studies are presented in this paper.