Positively charged polyatomic ion containing oxygen
An oxycation, or oxocation, is an ion with the generic formula A xOz+ y (where A represents a chemical element and O represents an oxygen atom). Their names normally end with the suffix "-ium" or "-yl".[1]
A few salts of oxycations have been reported. They are all associated with lighter main group elements. The nitrogen-containing cations are NO+ and NO+ 2. The latter is the active species in nitration reactions.
More complicated oxycations include species like SOF3+.[5] Aluminyl, antimonyl, bismuthyl derivatives more closely resemble the situation for transition metal oxy cations in the sense that they are bonded to many Lewis bases. The cation [Bi6(O)4(OH)4]6+, a face-capped octahedral cluster, is one example.[6]
Transition metal species
Many transition compounds that contain an oxo ligand can be viewed as salts of a hypothetical "oxycation." In condensed phase, they are always complexed with strong Lewis bases.
While species like vanadyl (VO2+ and VO3+) do not exist in solution, some oxycations can be generated in the vacuum chamber of mass spectrometers. Using ion cyclotron resonance, these oxy cations have been shown to react even with simple hydrocarbons, attesting to the high reactivity.[12]
1 2 Davlieva, Milya G.; Lindeman, Sergey V.; Neretin, Ivan S.; Kochi, Jay K. (2004). "Structural effects of carbon monoxide coordination to carbon centers. σ and π Bindings in aliphatic acyl versus aromatic aroyl cations". New Journal of Chemistry. 28 (12): 1568. doi:10.1039/B407654K.
↑ Boer, F. Peter (1968). "Crystal structure of a Friedel-Crafts intermediate. Methyloxocarbonium hexafluoroantimonate". Journal of the American Chemical Society. 90 (24): 6706–6710. doi:10.1021/ja01026a025.
↑ Bougon, R.; Cicha, W. V.; Lance, M.; Meublat, L.; Nierlich, M.; Vigner, J. (1991). "Preparation characterization and crystal structure of chloryl hexafluororuthenate(1-). Crystal structure of [ClF 2]+ [RuF 6]− ". Inorganic Chemistry. 30 (1): 102–109. doi:10.1021/ic00001a019.
↑ Brownstein, M.; Dean, P. A. W.; Gillespie, R. J. (1970). "The Trifluorosulphur(VI) Oxide Cation, SOF3+". Journal of the Chemical Society D: Chemical Communications: 9. doi:10.1039/C29700000009.
↑ Sundvall, Bengt (1983). "Crystal Structure of Tetraoxotetrahydroxohexabismuth (III) Perchlorate Heptahydrate, Bi6O4(HO)4(ClO4)6.7H2O: An X-ray and Neutron Diffraction Study". Inorganic Chemistry. 22 (13): 1906–1912. doi:10.1021/ic00155a017.
↑ Gunay, Ahmet; Theopold, Klaus H. (2010). "C−H Bond Activations by Metal Oxo Compounds". Chemical Reviews. 110 (2): 1060–1081. doi:10.1021/cr900269x. PMID20143877.
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