Synthesis, characterization and crystal structures of three dinuclear diperoxo complexes of Mo(VI): K2{O[MoO(O2)2H2O]2}·2H2O, (C6H8N,NH4){O[MoO(O2)2H2O]2} and (C6H8N,Na){O[MoO(O2)2H2O]2}

The crystal structures of three dinuclear diperoxo compounds have been determined from single-crystal X-ray diffraction data. All title compounds crystallize as yellow needle-shaped crystals in the triclinic space group P 1 ¯ (2). (1) K2{O[MoO(O2)2H2O]2}·2H2O crystallizes with a = 6.2745(2), b = 9.7279(3), c = 11.2976(3) Å, α = 78.743(1), β = 80.190(1), γ = 73.130(1)°, Z = 2. (2) (2-MepyH,NH4){O[MoO(O2)2H2O]2}, where 2-MepyH denotes 2-methylopyridine, crystallize with a = 6.733(5), b = 8.364(5), c = 13.984(5) Å, α = 73.702(5), β = 87.647(5), γ = 85.216(5)°, Z = 2. (3) (2-MepyH,Na){O[MoO(O2)2H2O]2} crystallize with a = 6.765(5), b = 8.421(5), c = 13.815(5) Å, α = 74.203(5), β = 84.775(5), γ = 71.371(5)°, Z = 2. Results of crystal structure determination, investigations of the stability of the obtained diperoxo compounds at room temperature, and the results of IR and TG/DSC studies are presented in this paper. The dinuclear diperoxo compounds are relatively stable at room temperature, in elevated temperatures they can decompose in explosive manner.