Infrared Absorption Spectra of Chromyl Fluoride and Chromyl Chloride

Abstract

The infrared absorption spectra of gaseous chromyl fluoride and gaseous chromyl chloride have been investigated. The region investigated for chromyl fluoride was 2 to 36 μ while that for chromyl chloride was 2 to 25 μ. Six fundamental and nineteen first overtone or binary combination bands have been observed in the spectrum of chromyl fluoride, the fundamental bands being located at 274, 304, 727, 789, 1006, and 1016 cm—1. The observed transitions have been assigned on the basis of a tetrahedral model of C2v symmetry. From the observed spectrum it was possible to estimate the probable positions of the three remaining fundamental bands. The observed spectrum of chromyl chloride included four fundamental bands located at 475, 499, 990, and 1000 cm—1 and one first overtone or binary combination band located at 1980 cm—1.

Spectroscopic and structural characterization of Cr(II)/SiO2 active site precursors in model Phillips polymerization catalysts

“…1978 cm À1 (assigned to the overtones and combination modes of the [CrO 2 ] fragment [25,27,45]) decreases, consistent with loss of CrO 2 Cl 2 from the surface (green lines in Fig. 1 inset) [25,27].…”

“…The IR spectra of both CrO 2 Cl 2 -modified silicas contain a small signal centered at ca. 1978 cm À1 , assigned to the overtones and combination modes 2t a (CrO 2 ), t a (CrO 2 ) + t s (CrO 2 ), and 2t s (CrO 2 ) [25,27,45].…”

In situ Raman spectroscopy studies on chromium oxide catalyst in an anhydrous hydrogen fluoride atmosphere

“…Therefore, the increasing intensity of the α 2 band may result from the generation of a new substance. According to the literature, [27,28] the following reactions will occur in the presence of AHF:…”

“…This indicates that Cr 2 O 3 species are formed in the catalyst. The phenomenon may be explained as follows: reaction (Eqn (1)) is a reversible reaction, [28] and the reverse the reaction dominates when AHF is turned off, by which CrO 3 species are produced. However, this phase is unstable at this temperature and transforms into Cr 2 O 3 (Eqn (3)), which is in good agreement with the arguments in the literature.…”

Etard reactions. I. Nature of complexes and their reactions with some oxygen and nitrogen donor molecules

“…These were made by comparison with those of chromyl chloride (8) and the donor molecules used (9,10 'Magnetic moment calculated from p = J(n(n + 2)).…”