, Volume 3, Issue 1, pp 318-320

The chemistry of chromium(V) oxide trichloride

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The recent upsurge of interest in chromium(V)(1–8) has highlighted two features of especial interest in its chemistry. Firstly, the complexes of chromium(V) are considerably more stable than has generally been assumed in the past, as exemplified by the recent characterisation of a water soluble complex, potassium bis(2-hydroxy-2-methylbutyrato)oxochromate(V)(1). Secondly, the d1 electronic configuration of the complexes makes them ideal model systems for study by such techniques as electron paramagnetic resonance (2) and electronic absorption spectroscopy(3,4) . Although chromium(V) oxide trichloride was first prepared in 1962, by the reaction between chromium(VI) oxide and SOCl2 or SO2Cl2 (9 10), and subsequently by the reaction between CrO2Cl2 and BCl3 (11), its chemistry and physical properties have remained virtually unstudied. We report here the first series of reactions of CrOCl3, along with details of its i.r. and photoelectron spectra.