Crystal structure of potassium tetraperoxomolybdate (Ⅵ) K_2[Mo(O_2)_4]

摘要

Potassium tetraperoxomolybdate (Ⅵ) K_2[Mo(O_2)_4] was prepared, and its X-ray powder diffraction pattern was recorded at low temperature (258 K). The unit cell parameters were refined to a = 10.7891(2) A, α=64.925(3)°, space group R-3c (167), Z=6. The compound is isostructural with potassium tetraperoxotungstate (Ⅵ) K_2[W(O_2)_4] (Stomberg, 1988). The sample of K_2[Mo(O_2)_4] was characterized by analytical investigations, and the results of crystal structure refinement by Rietveld method are presented; final R_P and R_(WP) are 9.79% and 12.37%, respectively.