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Abstract
RuO 4 was prepared by oxidation of elemental ruthenium. Two different modifications were obtained and investigated by X-ray single crystal diffraction. RuO 4-I has cubic symmetry ( P 4 ; - 3 n , Z = 8 , a = 8.509 ( 1 ) Å ) , and two independent tetrahedral molecules are present in the unit cell. Within the standard uncertainties in both molecules the distances Ru–O are 1.695 Å. The second modification, RuO 4-II, is monoclinic ( C 2 / c , Z = 4 , a = 9.302 ( 4 ) Å , b = 4.3967 ( 10 ) Å , c = 8.454 ( 4 ) Å , β = 116.82 ( 3 ) ° ) and isotypic with OsO 4. There is one independent molecule in the unit cell, which shows distances Ru–O of 1.697 and 1.701 Å, respectively.
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