title: Photocatalytic carbon disulfide production via charge transfer quenching of quantum dots.
abstract: 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 λ(irr) independent 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 ester (t)BuDTO 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.
authors.affiliation: Department of Chemistry and Biochemistry, University of California , Santa Barbara, California 93106, United States.
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Bernt
authors.forename: Peter T
authors.initials: PT
authors.lastname: Burks
authors.forename: Anthony W
authors.initials: AW
authors.lastname: DeMartino
authors.forename: Agustin E
authors.initials: AE
authors.lastname: Pierri
authors.forename: Elizabeth S
authors.initials: ES
authors.lastname: Levy
authors.forename: David F
authors.initials: DF
authors.lastname: Zigler
authors.forename: Peter C
authors.initials: PC
authors.lastname: Ford