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Open Access Publications from the University of California

Photocatalytic carbon disulfide production via charge transfer quenching of quantum dots

  • Author(s): Bernt, CM
  • Burks, PT
  • Demartino, AW
  • Pierri, AE
  • Levy, ES
  • Zigler, DF
  • Ford, PC
  • et al.

Published Web Location

Carbon disulfide, a potentially therapeutic small molecule, is generated via oxidative cleavage of 1,1-dithiooxalate (DTO) photosensitized by CdSe quantum dots (QDs). Irradiation of DTO-QD conjugates leads to λirrindependent photooxidation with a quantum yield of ∼4% in aerated pH 9 buffer solution that drops sharply in deaerated solution. Excess DTO is similarly decomposed, indicating labile exchange at the QD surfaces and a photocatalytic cycle. Analogous photoreaction occurs with the O-tert-butyl estertBuDTO in nonaqueous media. We propose that oxidation is initiated by hole transfer from photoexcited QD to surface DTO and that these substrates are a promising class of photocleavable ligands for modifying QD surface coordination. © 2013 American Chemical Society.

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