Deoxygenation of dibenzothiophene-S-oxide and dibenzoselenophene-Se-oxide: A comparison of direct and sensitized photolysis

Journal of Photochemistry and Photobiology A: Chemistry

Volumn 198, Issue 1, 2008, Pages 45-51

  Rockafellow, Erin M ^a   McCulla, Ryan D ^a   Jenks, William S ^a  

^a IOWA STATE UNIVERSITY   (United States)

Author keywords

Deoxygenation; Selenoxide; Sensitization; Sulfoxide; Triplet state

Indexed keywords

EID: 43849110953     PISSN: 10106030     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.jphotochem.2008.02.014     Document Type: Article

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41. In some cases, solubility also becomes a limitation.
42. A careful reading of reference 32 will reveal that a majority of this type of sulfoxides does not produce useful phosphorescence data, i.e., DBTO was one of the few exceptions. We routinely examine new sulfoxides or selenoxides for phosphorescence at 77 K, but are not surprised when a useful spectrum is not obtained.
43. The values reported here were remeasured for this work, as we have done for each paper in the series that addresses this reaction. We find that measured quantum yields are quite reproducible when measured repeatedly over a short time span for a project such as the current one. However, some variation from previously reported values for DBTO photolysis is common, and not unexpected due to the fairly severe dependence on wavelength, solvent-dependence, and inherently low value.
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45. A disproportionate fraction of the oxygenated solvent is produced very quickly. Thus, care must be taken in comparing DBSeO product oxidations to these control experiments.
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