results have been reported by Solomon, et a/.,15•35 and attributed to the 02+ ion.As might be expected, the X-ray diffraction pattern of the powder is very similar in both spacings and intensity distribution to that40 of NO+BF4~. We have indexed our pattern on the basis of an orthorhombic unit cell, 8.77 X 5.58 X 7.05 ± 0.01 A. Apart from the labeling of the axes, this is similar to the unit cell assigned to NOBF4 by Evans, et al.40 (8.91 X 5.68 X 6.98 A). The systematic absences are consistent with the space group Pnma which conforms also to the observation of the 02+ vibration in infrared absorption. The unit cell and symmetry are very similar to those previously assigned to NH4BF4, KBF4, and other compounds with the BaSQ4 structure.41 Details will be reported elsewhere.Nomenclature. In this paper we have referred to the compounds 02F2 and 04F2 as oxygen fluorides, in accordance with the recommendations of one of the referees and with the concurrence of the editor of this (40) J.
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