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Trioxidane, hydrogen trioxide or dihydrogen trioxide is an unstable molecule with the formula H2O3 or HOOOH. It is one of the hydrogen polyoxides. In aqueous solutions, trioxidane decomposes to form water molecule and singlet oxygen. The reverse reaction, the addition of singlet oxygen to water, typically does not occur in part due to the scarcity of singlet oxygen. In biological systems, however, ozone is known to be generated from singlet oxygen, and the presumed mechanism is an antibody-catalyzed production of trioxidane from singlet oxygen.[1]

dihydrogen trioxide

Contents

Preparation

Trioxidane can be obtained in small, but detectable, amounts in reactions of ozone and hydrogen peroxide, or by the electrical dissociation of water. Larger quantities have been prepared by the reaction of ozone with organic reducing agents at low temperatures in a variety of organic solvents, and it is also formed during the decomposition of organic hydrotrioxides (ROOOH).[2]

The reaction of ozone with hydrogen peroxide is known as the "Peroxone process." This mixture has been used for some time for treating groundwater contaminated with organic compounds. The reaction produces H2O5.

Structure

Spectroscopic analysis has shown the molecule to have a skewed linear structure H-O-O-O-H, with the O-O bond length being shorter than that in hydrogen peroxide. Various dimeric and trimeric forms also seem to exist. It is slightly more acidic than hydrogen peroxide, dissociating into H+ and OOOH-.[3]

Reactions

It readily decomposes into water and singlet oxygen, with a half-life of about 16 minutes in organic solvents at room temperature, but only milliseconds in water. It reacts with organic sulfides to form sulfoxides, but little else is known of its reactivity.

Recent research found that dihydrogen trioxide is the active ingredient responsible for the antimicrobial properties of the well known ozone / hydrogen peroxide mix. Because these two compounds are present in biological systems as well it is argued that an antibody in the human body can generate dihydrogen trioxide as a powerful oxidant against invading bacteria.[1][2] The source of the compound in biological systems is the reaction between singlet oxygen and water (which proceeds in either direction, of course, according to concentrations), with the singlet oxygen being produced by immune cells.[4]

In 2005 dihydrogen trioxide was observed experimentally by microwave spectroscopy in a supersonic jet. The molecule exists in a trans configuration with oxygen-oxygen bond lengths of 142.8 picometer compared to 146.4 picometer for hydrogen peroxide. Computational chemistry predicts that more oxygen chain molecules or hydrogen polyoxides exist and that even infinite oxygen chains can exist in a low temperature gas. With this spectroscopic evidence a search for these type of molecules can start in interstellar space.[3]

References

  1. ^ Dihydrogen Trioxide (HOOOH) Is Generated during the Thermal Reaction between Hydrogen Peroxide and Ozone Paul T. Nyffeler, Nicholas A. Boyle, Laxman Eltepu, Chi-Huey Wong, Albert Eschenmoser, Richard A. Lerner,, Paul Wentworth Jr. Angewandte Chemie International Edition volume 43, issue 35, pp. 4656-4659 2004
  2. ^ Božo Plesničar, Progress in the Chemistry of Dihydrogen Trioxide (HOOOH). Acta Chim. Slov. 2005, 52, 1-12.
  3. ^ a b The Rotational Spectrum and Structure of HOOOH Kohsuke Suma, Yoshihiro Sumiyoshi, and Yasuki Endo J. Am. Chem. Soc.; 2005; 127(43) pp 14998 - 14999; (Communication) DOI: 10.1021/ja0556530 Abstract
  4. ^ The Story of O - Roald Hoffmann, American Scientist
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