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The near-UV absorber OSSO and its isomers

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Disulfur dioxide, OSSO, has been proposed as the enigmatic “near-UV absorber” in the yellowish atmosphere of Venus. However, the fundamentally important spectroscopic properties and photochemistry of OSSO are scarcely documented. By either condensing gaseous SO or 266 laser photolysis of an S2⋯O2 complex in Ar or N2 at 15 K, syn-OSSO, anti-OSSO, and cyclic OS([double bond, length as m-dash]O)S were identified by IR and UV/Vis spectroscopy for the first time. The observed absorptions (λmax) for OSSO at 517 and 390 nm coincide with the near-UV absorption (320–400 nm) found in the Venus clouds by photometric measurements with the Pioneer Venus orbiter. Subsequent UV light irradiation (365 nm) depletes syn-OSSO and anti-OSSO and yields a fourth isomer, syn-OSOS, with concomitant dissociation into SO2 and elemental sulfur.

Graphical abstract: The near-UV absorber OSSO and its isomers

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The article was received on 05 Feb 2018, accepted on 27 Feb 2018 and first published on 27 Feb 2018

Article type: Communication
DOI: 10.1039/C8CC00999F
Citation: Chem. Commun., 2018, Advance Article
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    The near-UV absorber OSSO and its isomers

    Z. Wu, H. Wan, J. Xu, B. Lu, Y. Lu, A. K. Eckhardt, P. R. Schreiner, C. Xie, H. Guo and X. Zeng, Chem. Commun., 2018, Advance Article , DOI: 10.1039/C8CC00999F

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