Chromium(V) Oxide Trichloride,and some Pentachlorido‐oxido‐chromate(V) Salts: Structures and Spectroscopic Characterization |
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Authors: | Andrew L Hector William Levason Mark E Light Gillian Reid Kripasindhu Sardar Wenjian Zhang |
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Institution: | School of Chemistry, University of Southampton, SO17 1BJ U. K |
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Abstract: | Crystalline CrOCl3 contains Cl2OCr(μ‐Cl)2CrOCl2] molecules with two square pyramidal CrOCl4 units sharing a common edge and with the Cr–O arranged anti, a new structure type for transition metal MOX3 compounds. Crystals are monoclinic with space group P21/c, Z = 4, with a = 5.735(5), b = 13.738(7), c = 11.318(4) Å, α = 90°, β = 98.346(6)°, γ = 90°. Its IR and UV/Vis spectra are reported and compared with those of the C3v monomer found in the gas phase. Structures are also reported for M2CrOCl5] (M = Cs or Rb) and show a pseudo‐octahedral anion. Cs2CrOCl5] adopts a K2PtCl6‐type structure with CrOCl5]2– ions randomly orientated, but Rb2CrOCl5] is orthorhombic with space group Pnma with a = 13.6471(7), b = 9.9175(5), and c = 6.9562(4) Å. Rietveld refinement of the data on the rubidium salt gave Cr–O = 1.628(1), Cr–CltransO = 2.652(7), Cr–CltransCl = 2.239(8)–2.342(3) Å. Corresponding CrV oxide bromide species do not form. |
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Keywords: | Oxide chloride Chromium Pentachlorido‐oxido‐chromate(V) X‐ray structure |
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