title: Solution phase photolysis of 1,2-dithiane alone and with single-walled carbon nanotubes.
abstract: Photolysis of 1,2-dithiane (1) in acetonitrile with single walled carbon nanotubes (SWCNTs) was earlier reported to form thiol-functionalized SWCNTs via the butane-1,4-dithiyl diradical (2). The present study shows that 2 instead undergoes a facile rearrangement to thiophane-2-thiol (6). This photoreaction is clean, rapid, and irreversible under 313 nm irradiation. The secondary photolysis of 6 with SWCNTs at a shorter wavelength (254 nm) leads to 2-thiophanyl radicals 8, which derivatize SWCNTs by covalent attachment. Pyrolysis of the resulting "sulfurized SWCNTs" affords a mixture of organosulfur compounds, including thiophene formed by dehydrogenation. An unknown additional mechanism causes high TGA weight loss and a large incorporation of sulfur.
authors.affiliation: Department of Chemistry, Rice University, Houston, Texas 77005, United States. engel@rice.edu
authors.forename: Paul S
authors.initials: PS
authors.lastname: Engel
authors.forename: Vittal B
authors.initials: VB
authors.lastname: Gudimetla
authors.forename: Jorge S
authors.initials: JS
authors.lastname: Gancheff
authors.forename: Pablo A
authors.initials: PA
authors.lastname: Denis