Characterisation of chromium(VI) oxide tetrafluoride, CrOF4, and caesium pentafluoro-oxochromate(VI) Cs[CrOF5]
The title compounds have been characterised by elemental analyses, i.r. And u.v.–visible spectroscopy, and some of their reactions are described. Matrix isolation studies on CrOF4 show characteristic i.r. absorptions at 1 027.7 and 746.3,741.6 cm–1 in nitrogen matrices, which are assigned as the A1(CrO) and E(Cr–F) modes respectively of the C4v monomer. Chromium isotope fine structure and relative intensity estimates suggest a bond angle of ca. 106° for OCrF. The electronic spectrum of matrix-isolated CrOF4 shows prominent charge-transfer bands at 40 000 and 27 000 cm–1.