The tetraoxygen molecule (O4), also called oxozone, is an allotrope of oxygen consisting of four oxygen atoms.

History

Tetraoxygen was first predicted in 1924 by Gilbert N. Lewis, who proposed it as an explanation for the failure of liquid oxygen to obey Curie's law.[1] Though not entirely inaccurate, computer simulations indicate that although there are no stable O4 molecules in liquid oxygen, O2 molecules do tend to associate in pairs with antiparallel spins, forming transient O4 units.[2] In 1999, researchers thought that solid oxygen in its ε-phase, also known as red oxygen, (at pressures above 10 GPa) was O4.[3] However, in 2006, it was shown by X-ray crystallography that this stable phase is in fact octaoxygen (O
8).[4] Nevertheless, positively charged tetraoxygen has been detected as a short-lived chemical species in mass spectrometry experiments.[5]

Structure

Theoretical calculations have predicted the existence of metastable O4 molecules with two different shapes: a "puckered" square like cyclobutane or S4,[6] and a "pinwheel" with three oxygen atoms surrounding a central one in a trigonal planar formation similar to boron trifluoride or sulfur trioxide.[7][8] It was previously pointed out that the "pinwheel" O4 molecule should be the natural continuation of the isoelectronic series BO3−
3, CO2−
3, NO−
3,[9] and analogous to SO3; that observation served as the basis for the mentioned theoretical calculations.

Theoretical structures of metastable O4.
D2d structure D3h structure

In 2001, a team at the University of Rome La Sapienza conducted a neutralization-reionization mass spectrometry experiment to investigate the structure of free O4 molecules.[5] Their results did not agree with either of the two proposed molecular structures, but they did agree with a complex between two O2 molecules, one in the ground state and the other in a specific excited state.

Absorption bands of O4 e.g. at 360, 477 and 577 nm are frequently used to achieve aerosol inversions in atmospheric optical absorption spectroscopy. Due to the known distribution of O2 and therefore also O4, O4 slant column densities can be used to retrieve aerosol profiles which can then be used again in radiative transfer models to model light paths.[10]

See also

References

  1. ^ Lewis, Gilbert N. (1924). "The Magnetism of Oxygen and the Molecule O4". Journal of the American Chemical Society. 46 (9): 2027–2032. doi:10.1021/ja01674a008.
  2. ^ Oda, Tatsuki; Alfredo Pasquarello (2004). "Noncollinear magnetism in liquid oxygen: A first-principles molecular dynamics study". Physical Review B. 70 (134402): 1–19. Bibcode:2004PhRvB..70m4402O. doi:10.1103/PhysRevB.70.134402. hdl:2297/3462. S2CID 123535786.
  3. ^ Gorelli, Federico A.; Lorenzo Ulivi; Mario Santoro; Roberto Bini (1999). "The ε Phase of Solid Oxygen: Evidence of an O4 Molecule Lattice". Physical Review Letters. 83 (20): 4093–4096. Bibcode:1999PhRvL..83.4093G. doi:10.1103/PhysRevLett.83.4093.
  4. ^ Lars F. Lundegaard, Gunnar Weck, Malcolm I. McMahon, Serge Desgreniers and Paul Loubeyre (2006). "Observation of an O8 molecular lattice in the phase of solid oxygen". Nature. 443 (7108): 201–204. Bibcode:2006Natur.443..201L. doi:10.1038/nature05174. PMID 16971946. S2CID 4384225.((cite journal)): CS1 maint: multiple names: authors list (link)
  5. ^ a b Cacace, Fulvio; Giulia de Petris; Anna Troiani (2001). "Experimental Detection of Tetraoxygen". Angewandte Chemie International Edition. 40 (21): 4062–4065. doi:10.1002/1521-3773(20011105)40:21<4062::AID-ANIE4062>3.0.CO;2-X. PMID 12404493.
  6. ^ Hernández-Lamoneda, R.; A. Ramírez-Solís (2000). "Reactivity and electronic states of O4 along minimum energy paths". Journal of Chemical Physics. 113 (10): 4139–4145. Bibcode:2000JChPh.113.4139H. doi:10.1063/1.1288370.
  7. ^ Røeggen, I.; E. Wisløff Nilssen (1989). "Prediction of a metastable D3h form of tetra oxygen". Chemical Physics Letters. 157 (5): 409–414. Bibcode:1989CPL...157..409R. doi:10.1016/0009-2614(89)87272-0.
  8. ^ Hotokka, M. (1989). "Ab initio study of bonding trends in the series BO33−, CO32−, NO3− and O4(D3h)". Chemical Physics Letters. 157 (5): 415–418. Bibcode:1989CPL...157..415H. doi:10.1016/0009-2614(89)87273-2.
  9. ^ Jubert,A.H.; E.L.Varetti (1986). "On the possible existence of the O4 molecule with D3h symmetry". Anales de Química (Spain)82:227-230.
  10. ^ Friess, U. and Monks, P. S. and Remedios, J. J. and Wagner, T. and Platt, U. (2005). "MAX-DOAS O4 measurements: A new technique to derive information on atmospheric aerosols - Retrieval of aerosol properties". Journal of Geophysical Research. 109 (D22): n/a. Bibcode:2004JGRD..10922205W. CiteSeerX 10.1.1.659.6946. doi:10.1029/2004jd004904.((cite journal)): CS1 maint: multiple names: authors list (link)
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