Synthesis, characterization and crystal structures of three dinuclear diperoxo complexes of Mo(VI): K 2{O[MoO(O 2) 2H 2O] 2}·2H 2O, (C 6H 8N,NH 4){O[MoO(O 2) 2H 2O] 2} and (C 6H 8N,Na){O[MoO(O 2) 2H 2O] 2}

Abstract

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) K 2{O[MoO(O 2) 2H 2O] 2}·2H 2O 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,NH 4){O[MoO(O 2) 2H 2O] 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(O 2) 2H 2O] 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.