%0 Journal Article
%A Cagan, David
A.
%A Garcia, Arman C.
%A Li, Kin
%A Ashen-Garry, David
%A Tadle, Abegail C.
%A Zhang, Dong
%A Nelms, Katherine J.
%A Liu, Yangyang
%A Shallenberger, Jeffrey R.
%A Stapleton, Joshua J.
%A Selke, Matthias
%D 2018
%T Chemistry
of Singlet Oxygen with a Cadmium–Sulfur
Cluster: Physical Quenching versus Photooxidation
%U https://acs.figshare.com/articles/journal_contribution/Chemistry_of_Singlet_Oxygen_with_a_Cadmium_Sulfur_Cluster_Physical_Quenching_versus_Photooxidation/7525052
%R 10.1021/jacs.8b10516.s001
%2 https://acs.figshare.com/ndownloader/files/13992920
%K SPh
%K nanoparticle
%K singlet oxygen generation
%K singlet oxygen quenching rate constants
%K 4 N
%K Cd 4
%K 1 O 2 removal
%K quantum
%K CD 3 OD
%K singlet oxygen
%K cluster
%K cadmium
%K dot
%K Physical
%X We
investigated the chemistry of singlet oxygen with a cadmium–sulfur
cluster, (Me4N)2[Cd4(SPh)10]. This cluster was used as a model for cadmium–sulfur nanoparticles.
Such nanoparticles are often used in conjunction with photosensitizers
(for singlet oxygen generation or dye-sensitized solar cells), and
hence, it is important to determine if cadmium–sulfur moieties
physically quench and/or chemically react with singlet oxygen. We
found that (Me4N)2[Cd4(SPh)10] is indeed a very strong quencher of singlet oxygen with total rate
constants for 1O2 removal of (5.8 ± 1.3)
× 108 M–1 s–1 in
acetonitrile and (1.2 ± 0.5) × 108 M–1 s–1 in CD3OD. Physical quenching predominates,
but chemical reaction leading to decomposition of the cluster and
formation of sulfinate is also significant, with a rate constant of
(4.1 ± 0.6) × 106 M–1 s–1 in methanol. Commercially available cadmium–sulfur
quantum dots (“lumidots”) show similar singlet oxygen
quenching rate constants, based on the molar concentration of the
quantum dots.
%I ACS Publications