On the interaction of compounds of chromium(VI) with hydrogen peroxide. A study of chromium(VI) and (V) peroxides in the acid–basic pH range

Peroxides and Chromium Compounds – The Ether Test for Identity

“…We also calculated the visible electronic spectrum of the geometry-optimised intermediate compound CrO(O 2 ) 2 · H 2 O with the same DFT algorithm [29] to have a maximum at 527 nm. The geometry obtained is similar to the geometry published by Gili and co-workers, using a different basis set [31]. Coordinative bond lengths are similar to those measured by an X-ray absorption fine structure experiment [35 -37].…”

“…Constitutions of pyridine and bipyridyl complexes have been investigated [5,19,26,31] and confirmed for a series of N ligands and pyridine N-oxide [31]. Kinetics of CrO 5 formation have been elucidated within a wide pH range [5 -7, 13, 21, 22, 33, 34].…”

“…According to a photoelectron spectroscopy study [39], free CrO 5 contains one cyclic and one open-chain peroxide moiety. For H 2 O as a ligand the hitherto "belief" of CrO(O 2 ) 2 · H 2 O being blue perchromic acid [33], has been accepted generally [34] owing to [31]. For this complex, formal replacement of pyridine by a water ligand produced an accurate prediction of a Raman spectrum in an earlier study [38].…”

Vibrational spectra of the peroxochromates (NH4)3[Cr(O2)4], K3[Cr(O2)4] and Rb3[Cr(O2)4]

“…However, in this case a much darker, almost black, precipitate, 16 was obtained which exploded violently when separated from the solution.…”

“…Fergusson et al 13 and Griffith and Wilkins 14,15 reported an intense band at 875 cm 1 in the infrared spectrum of K 3 [Cr O 2 4 ]. Gili et al 16 stated that in the IR spectra of the chromium peroxo complexes a strong band at 885 cm 1 is observed, attributed to the O-O stretching vibrations. For K 3 [Nb O 2 4 ] 14 and K 3 [Ta O 2 4 ], 14,15 the corresponding intense bands are found in the infrared spectra at 813 and 807 cm 1 , respectively.…”